Sign-off timing: every corner, every check

Time one final physical design across cell corners, inspect each check type, and keep missing coverage visible.

Lesson
L7.1
Time
26 min
Runs on
OpenROAD
Check
5 questions

The routed MAC passes setup at TT with 1.0077 ns slack under a chosen 6 ns clock. The same netlist and SPEF give -5.6158 ns at the cold slow corner. Its negative minimum slack comes from reset removal, which a hold-only summary would misdiagnose.

Timing pathThe cold slow corner exposes the failing data path

_809_ → _825_setup check, latest arrival15 cells

  • Clock latency
  • Cell delay
  • Wire delay
  • Setup time
The cold slow corner exposes the failing data path024681012time (ns)launch clk ↑capture clk ↑Data arrivesRequired byclock 0.5643 ns_809_/CLK → _809_/Q (dfrtp_1): 1.0062 ns1_809_/Q → _607_/A: 0.0009 ns_607_/A → _607_/Y (xnor2_1): 0.6161 ns2_607_/Y → _619_/A2: 0.0001 ns_619_/A2 → _619_/Y (o21ai_0): 0.3821 ns3_619_/Y → _641_/C: 0.0003 ns_641_/C → _641_/X (maj3_1): 1.0062 ns4_641_/X → _663_/C: 0.0003 ns_663_/C → _663_/X (maj3_1): 0.9819 ns5_663_/X → _685_/C: 0.0002 ns_685_/C → _685_/X (maj3_1): 0.9768 ns6_685_/X → _707_/C: 0.0002 ns_707_/C → _707_/X (maj3_1): 1.0067 ns7_707_/X → _727_/A1: 0.0003 ns_727_/A1 → _727_/Y (a211oi_1): 0.7284 ns8_727_/Y → _729_/A3: 0.0001 ns_729_/A3 → _729_/Y (o31ai_1): 0.4130 ns9_729_/Y → _731_/A2: 0.0004 ns_731_/A2 → _731_/X (o211a_1): 0.5650 ns10_731_/X → _734_/A3: 0.0002 ns_734_/A3 → _734_/Y (o311ai_0): 1.3522 ns11_734_/Y → _736_/A3: 0.0004 ns_736_/A3 → _736_/Y (a31oi_1): 0.6989 ns12_736_/Y → _737_/A2: 0.0003 ns_737_/A2 → _737_/Y (a21oi_1): 0.6913 ns13_737_/Y → _740_/A2: 0.0003 ns_740_/A2 → _740_/Y (a211oi_1): 0.4146 ns14_740_/Y → _669_/B: 0.0002 ns_669_/B → _669_/X (xor2_1): 0.3833 ns_669_/X → _825_/D: 0.0001 nsclock 0.5641 nssetup −0.3886 nsslack −5.6158 ns · violatedarrival 11.7914required 6.1755The cold slow corner exposes the failing data path0510time (ns)launch clk ↑capture clk ↑Data arrivesRequired byclock 0.5643 ns_809_/CLK → _809_/Q (dfrtp_1): 1.0062 ns1_809_/Q → _607_/A: 0.0009 ns_607_/A → _607_/Y (xnor2_1): 0.6161 ns2_607_/Y → _619_/A2: 0.0001 ns_619_/A2 → _619_/Y (o21ai_0): 0.3821 ns_619_/Y → _641_/C: 0.0003 ns_641_/C → _641_/X (maj3_1): 1.0062 ns4_641_/X → _663_/C: 0.0003 ns_663_/C → _663_/X (maj3_1): 0.9819 ns5_663_/X → _685_/C: 0.0002 ns_685_/C → _685_/X (maj3_1): 0.9768 ns6_685_/X → _707_/C: 0.0002 ns_707_/C → _707_/X (maj3_1): 1.0067 ns7_707_/X → _727_/A1: 0.0003 ns_727_/A1 → _727_/Y (a211oi_1): 0.7284 ns8_727_/Y → _729_/A3: 0.0001 ns_729_/A3 → _729_/Y (o31ai_1): 0.4130 ns_729_/Y → _731_/A2: 0.0004 ns_731_/A2 → _731_/X (o211a_1): 0.5650 ns_731_/X → _734_/A3: 0.0002 ns_734_/A3 → _734_/Y (o311ai_0): 1.3522 ns11_734_/Y → _736_/A3: 0.0004 ns_736_/A3 → _736_/Y (a31oi_1): 0.6989 ns_736_/Y → _737_/A2: 0.0003 ns_737_/A2 → _737_/Y (a21oi_1): 0.6913 ns_737_/Y → _740_/A2: 0.0003 ns_740_/A2 → _740_/Y (a211oi_1): 0.4146 ns_740_/Y → _669_/B: 0.0002 ns_669_/B → _669_/X (xor2_1): 0.3833 ns_669_/X → _825_/D: 0.0001 nsclock 0.5641 nssetup −0.3886 nsslack −5.6158 ns · violatedarrival 11.7914required 6.1755
Read the path as a table

Launch: clk rise edge at 0.0000 ns, clock latency 0.5643 ns. Capture: clk rise edge at 6.0000 ns, latency 0.5641 ns, library setup time −0.3886 ns.

Arrival 11.7914 ns, required 6.1755 ns, slack −5.6158 ns (violated).

CellArcThroughEdgeDelay (ns)Time (ns)Slew (ns)
1_809_/CLK → _809_/Qdfrtp_1fall1.00621.57060.2563
_809_/Q → _607_/Awire acc[1]fall0.00091.57150.2563
2_607_/A → _607_/Yxnor2_1rise0.61612.18760.4742
_607_/Y → _619_/A2wire _080_rise0.00012.18770.4742
3_619_/A2 → _619_/Yo21ai_0fall0.38212.56980.2084
_619_/Y → _641_/Cwire _081_fall0.00032.57010.2084
4_641_/C → _641_/Xmaj3_1fall1.00623.57620.1768
_641_/X → _663_/Cwire _083_fall0.00033.57650.1768
5_663_/C → _663_/Xmaj3_1fall0.98194.55840.1665
_663_/X → _685_/Cwire _085_fall0.00024.55860.1665
6_685_/C → _685_/Xmaj3_1fall0.97685.53540.1658
_685_/X → _707_/Cwire _087_fall0.00025.53570.1658
7_707_/C → _707_/Xmaj3_1fall1.00676.54240.1887
_707_/X → _727_/A1wire _089_fall0.00036.54270.1887
8_727_/A1 → _727_/Ya211oi_1rise0.72847.27110.6601
_727_/Y → _729_/A3wire _093_rise0.00017.27130.6601
9_729_/A3 → _729_/Yo31ai_1fall0.41307.68420.1849
_729_/Y → _731_/A2wire _095_fall0.00047.68470.1849
10_731_/A2 → _731_/Xo211a_1fall0.56508.24960.0869
_731_/X → _734_/A3wire _097_fall0.00028.24980.0869
11_734_/A3 → _734_/Yo311ai_0rise1.35229.60201.4960
_734_/Y → _736_/A3wire _100_rise0.00049.60241.4960
12_736_/A3 → _736_/Ya31oi_1fall0.698910.30120.2612
_736_/Y → _737_/A2wire _101_fall0.000310.30150.2612
13_737_/A2 → _737_/Ya21oi_1rise0.691310.99280.5853
_737_/Y → _740_/A2wire _102_rise0.000310.99310.5853
14_740_/A2 → _740_/Ya211oi_1fall0.414611.40770.1967
_740_/Y → _669_/Bwire _105_fall0.000211.40790.1967
15_669_/B → _669_/Xxor2_1fall0.383311.79130.1799
_669_/X → _825_/Dwire _020_fall0.000111.79140.1799
The report
Startpoint: _809_ (rising edge-triggered flip-flop clocked by clk)
Endpoint: _825_ (rising edge-triggered flip-flop clocked by clk)
Path Group: clk
Path Type: max

Fanout       Cap      Slew     Delay      Time   Description
-------------------------------------------------------------------------------------
                              0.0000    0.0000   clock clk (rise edge)
                              0.0000    0.0000   clock source latency
     1    0.0160    0.0000    0.0000    0.0000 ^ clk (in)
                                                 clk (net)
                    0.0004    0.0002    0.0002 ^ clkbuf_0_clk/A (sky130_fd_sc_hd__clkbuf_8)
     4    0.0268    0.1207    0.2264    0.2266 ^ clkbuf_0_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_0_clk (net)
                    0.1207    0.0008    0.2274 ^ clkbuf_2_1__f_clk/A (sky130_fd_sc_hd__clkbuf_8)
    14    0.0455    0.1845    0.3349    0.5623 ^ clkbuf_2_1__f_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_2_1__leaf_clk (net)
                    0.1845    0.0020    0.5643 ^ _809_/CLK (sky130_fd_sc_hd__dfrtp_1)
     4    0.0327    0.2563    1.0062    1.5706 v _809_/Q (sky130_fd_sc_hd__dfrtp_1)
                                                 acc[1] (net)
                    0.2563    0.0009    1.5715 v _607_/A (sky130_fd_sc_hd__xnor2_1)
     2    0.0076    0.4742    0.6161    2.1876 ^ _607_/Y (sky130_fd_sc_hd__xnor2_1)
                                                 _080_ (net)
                    0.4742    0.0001    2.1877 ^ _619_/A2 (sky130_fd_sc_hd__o21ai_0)
     2    0.0092    0.2084    0.3821    2.5698 v _619_/Y (sky130_fd_sc_hd__o21ai_0)
                                                 _081_ (net)
                    0.2084    0.0003    2.5701 v _641_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0097    0.1768    1.0062    3.5762 v _641_/X (sky130_fd_sc_hd__maj3_1)
                                                 _083_ (net)
                    0.1768    0.0003    3.5765 v _663_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0087    0.1665    0.9819    4.5584 v _663_/X (sky130_fd_sc_hd__maj3_1)
                                                 _085_ (net)
                    0.1665    0.0002    4.5586 v _685_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0086    0.1658    0.9768    5.5354 v _685_/X (sky130_fd_sc_hd__maj3_1)
                                                 _087_ (net)
                    0.1658    0.0002    5.5357 v _707_/C (sky130_fd_sc_hd__maj3_1)
     3    0.0116    0.1887    1.0067    6.5424 v _707_/X (sky130_fd_sc_hd__maj3_1)
                                                 _089_ (net)
                    0.1887    0.0003    6.5427 v _727_/A1 (sky130_fd_sc_hd__a211oi_1)
     2    0.0068    0.6601    0.7284    7.2711 ^ _727_/Y (sky130_fd_sc_hd__a211oi_1)
                                                 _093_ (net)
                    0.6601    0.0001    7.2713 ^ _729_/A3 (sky130_fd_sc_hd__o31ai_1)
     3    0.0116    0.1849    0.4130    7.6842 v _729_/Y (sky130_fd_sc_hd__o31ai_1)
                                                 _095_ (net)
                    0.1849    0.0004    7.6847 v _731_/A2 (sky130_fd_sc_hd__o211a_1)
     2    0.0060    0.0869    0.5650    8.2496 v _731_/X (sky130_fd_sc_hd__o211a_1)
                                                 _097_ (net)
                    0.0869    0.0002    8.2498 v _734_/A3 (sky130_fd_sc_hd__o311ai_0)
     3    0.0113    1.4960    1.3522    9.6020 ^ _734_/Y (sky130_fd_sc_hd__o311ai_0)
                                                 _100_ (net)
                    1.4960    0.0004    9.6024 ^ _736_/A3 (sky130_fd_sc_hd__a31oi_1)
     2    0.0090    0.2612    0.6989   10.3012 v _736_/Y (sky130_fd_sc_hd__a31oi_1)
                                                 _101_ (net)
                    0.2612    0.0003   10.3015 v _737_/A2 (sky130_fd_sc_hd__a21oi_1)
     3    0.0118    0.5853    0.6913   10.9928 ^ _737_/Y (sky130_fd_sc_hd__a21oi_1)
                                                 _102_ (net)
                    0.5853    0.0003   10.9931 ^ _740_/A2 (sky130_fd_sc_hd__a211oi_1)
     4    0.0126    0.1967    0.4146   11.4077 v _740_/Y (sky130_fd_sc_hd__a211oi_1)
                                                 _105_ (net)
                    0.1967    0.0002   11.4079 v _669_/B (sky130_fd_sc_hd__xor2_1)
     1    0.0027    0.1799    0.3833   11.7913 v _669_/X (sky130_fd_sc_hd__xor2_1)
                                                 _020_ (net)
                    0.1799    0.0001   11.7914 v _825_/D (sky130_fd_sc_hd__dfrtp_1)
                                       11.7914   data arrival time

                              6.0000    6.0000   clock clk (rise edge)
                              0.0000    6.0000   clock source latency
     1    0.0160    0.0000    0.0000    6.0000 ^ clk (in)
                                                 clk (net)
                    0.0004    0.0002    6.0002 ^ clkbuf_0_clk/A (sky130_fd_sc_hd__clkbuf_8)
     4    0.0268    0.1207    0.2264    6.2266 ^ clkbuf_0_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_0_clk (net)
                    0.1207    0.0007    6.2274 ^ clkbuf_2_2__f_clk/A (sky130_fd_sc_hd__clkbuf_8)
    14    0.0452    0.1827    0.3333    6.5607 ^ clkbuf_2_2__f_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_2_2__leaf_clk (net)
                    0.1828    0.0034    6.5641 ^ _825_/CLK (sky130_fd_sc_hd__dfrtp_1)
                              0.0000    6.5641   clock reconvergence pessimism
                             -0.3886    6.1755   library setup time
                                        6.1755   data required time
-------------------------------------------------------------------------------------
                                        6.1755   data required time
                                      -11.7914   data arrival time
-------------------------------------------------------------------------------------
                                       -5.6158   slack (VIOLATED)

Fresh OpenSTA session on the exported final netlist and detailed-route SPEF. Clock delays are propagated through the actual tree.

Keep the physical design fixed

L6 replaced the global wire estimate with extracted networks; sign-off now tests that physical result against the required operating conditions. Rebuilding placement at each corner would mix a different implementation into the comparison. Here every fresh timing session reads the same final connectivity and wire networks.

Four views must describe the same blockThe exported circuit, extracted wires, operating-condition library and timing requirements meet in one timing analysis.
Four views must describe the same blockThe exported circuit, extracted wires, operating-condition library and timing requirements meet in one timing analysis. component Final netlist CTS, repair andprotection cells component Detailed-routeSPEF One pinned RC model component Corner Liberty component Final SDC component Fresh timingsession connectivityparasiticscell behaviorrequirements
Read the diagram as text
  • Final netlist: CTS, repair and protection cells
  • Detailed-route SPEF: One pinned RC model
  • Corner Liberty
  • Final SDC
  • Fresh timing session
  • Final netlist → Fresh timing session: connectivity
  • Detailed-route SPEF → Fresh timing session: parasitics
  • Corner Liberty → Fresh timing session: cell behavior
  • Final SDC → Fresh timing session: requirements

Changing a library view does not relocate cells or reroute the design.

A library corner represents characterized cell behavior at a process, voltage and temperature condition. An RC corner represents an interconnect condition, which is a separate choice. The local platform supplies four cell views but only one pinned extraction model; this exercise does not invent minimum or maximum RC views.

Slow cells with high wire RC often stress setup, while fast cells with low RC often stress hold. Those pairings are useful starting points, not a proof of which case is worst. L2.9 already showed temperature inversion; here the cold slow cell view is again worse for setup than the hot slow view.

Multi-corner multi-mode analysis, or MCMM, also includes distinct operating modes such as functional operation, scan and reset release. Each mode needs its own legitimate clocks, I/O assumptions and exceptions. Extracted timing still uses models; its credibility comes from appropriate models and coverage, not from eliminating every approximation.

Separate the checks in the matrix

Cell corner / same RCSetupData holdRecoveryRemovalSlew / cap / fanout
tt_025C_1v801.0077 ns0.5092 ns5.4731 ns0.3489 ns0 / 0 / 0
ss_100C_1v60-4.3593 ns0.6995 ns5.9433 ns-0.2211 ns0 / 0 / 0
ss_n40C_1v60-5.6158 ns0.6329 ns6.0316 ns-0.3528 ns1 / 0 / 0
ff_n40C_1v953.0323 ns0.3233 ns5.2922 ns0.5702 ns0 / 0 / 0

Worst reported check of each type. Reset release uses the chosen 1 ns input-delay assumption; it is not silently cut from timing.

Setup and hold constrain data around a capturing edge. Recovery and removal instead constrain release of an asynchronous reset around that edge. A minimum-delay summary can therefore contain a removal failure, even when every reported data-hold path passes. Read the path’s check type before proposing a delay-cell repair.

Maximum transition checks limit edge duration; capacitance and fanout checks limit different loading quantities. Minimum pulse width checks whether a clock stays high or low long enough at the receiving pin. Clock-gating checks constrain enable changes around the gate’s vulnerable clock phase, when such gates are present.

Read the typical-corner path and pulse-width report
Timing pathThe same implementation at TT

_809_ → _827_setup check, latest arrival16 cells

  • Clock latency
  • Cell delay
  • Wire delay
  • Setup time
The same implementation at TT0123456time (ns)launch clk ↑capture clk ↑Data arrivesRequired byclock 0.3026 ns_809_/CLK → _809_/Q (dfrtp_1): 0.4999 ns1_809_/Q → _607_/A: 0.0009 ns_607_/A → _607_/Y (xnor2_1): 0.2759 ns2_607_/Y → _619_/A2: 0.0001 ns_619_/A2 → _619_/Y (o21ai_0): 0.1792 ns3_619_/Y → _641_/C: 0.0003 ns_641_/C → _641_/X (maj3_1): 0.4268 ns4_641_/X → _663_/C: 0.0003 ns_663_/C → _663_/X (maj3_1): 0.4083 ns5_663_/X → _685_/C: 0.0002 ns_685_/C → _685_/X (maj3_1): 0.4065 ns6_685_/X → _707_/C: 0.0003 ns_707_/C → _707_/X (maj3_1): 0.4218 ns7_707_/X → _727_/A1: 0.0004 ns_727_/A1 → _727_/Y (a211oi_1): 0.3106 ns8_727_/Y → _729_/A3: 0.0001 ns_729_/A3 → _729_/Y (o31ai_1): 0.1721 ns9_729_/Y → _731_/A2: 0.0005 ns_731_/A2 → _731_/X (o211a_1): 0.2463 ns10_731_/X → _734_/A3: 0.0002 ns_734_/A3 → _734_/Y (o311ai_0): 0.5771 ns11_734_/Y → _736_/A3: 0.0004 ns_736_/A3 → _736_/Y (a31oi_1): 0.2391 ns12_736_/Y → _737_/A2: 0.0003 ns_737_/A2 → _737_/Y (a21oi_1): 0.3214 ns13_737_/Y → _740_/A2: 0.0004 ns_740_/A2 → _740_/Y (a211oi_1): 0.1914 ns_740_/Y → _742_/C: 0.0003 ns_742_/C → _742_/Y (nand3_1): 0.1289 ns_742_/Y → _748_/B: 0.0001 ns_748_/B → _748_/Y (xnor2_1): 0.1150 ns_748_/Y → _827_/D: 0.0001 nsclock 0.3028 nssetup −0.0674 nsslack +1.0077 ns · metarrival 5.2277required 6.2354The same implementation at TT0246time (ns)launch clk ↑capture clk ↑Data arrivesRequired byclock 0.3026 ns_809_/CLK → _809_/Q (dfrtp_1): 0.4999 ns1_809_/Q → _607_/A: 0.0009 ns_607_/A → _607_/Y (xnor2_1): 0.2759 ns2_607_/Y → _619_/A2: 0.0001 ns_619_/A2 → _619_/Y (o21ai_0): 0.1792 ns_619_/Y → _641_/C: 0.0003 ns_641_/C → _641_/X (maj3_1): 0.4268 ns4_641_/X → _663_/C: 0.0003 ns_663_/C → _663_/X (maj3_1): 0.4083 ns5_663_/X → _685_/C: 0.0002 ns_685_/C → _685_/X (maj3_1): 0.4065 ns6_685_/X → _707_/C: 0.0003 ns_707_/C → _707_/X (maj3_1): 0.4218 ns7_707_/X → _727_/A1: 0.0004 ns_727_/A1 → _727_/Y (a211oi_1): 0.3106 ns8_727_/Y → _729_/A3: 0.0001 ns_729_/A3 → _729_/Y (o31ai_1): 0.1721 ns_729_/Y → _731_/A2: 0.0005 ns_731_/A2 → _731_/X (o211a_1): 0.2463 ns_731_/X → _734_/A3: 0.0002 ns_734_/A3 → _734_/Y (o311ai_0): 0.5771 ns11_734_/Y → _736_/A3: 0.0004 ns_736_/A3 → _736_/Y (a31oi_1): 0.2391 ns_736_/Y → _737_/A2: 0.0003 ns_737_/A2 → _737_/Y (a21oi_1): 0.3214 ns_737_/Y → _740_/A2: 0.0004 ns_740_/A2 → _740_/Y (a211oi_1): 0.1914 ns_740_/Y → _742_/C: 0.0003 ns_742_/C → _742_/Y (nand3_1): 0.1289 ns_742_/Y → _748_/B: 0.0001 ns_748_/B → _748_/Y (xnor2_1): 0.1150 ns_748_/Y → _827_/D: 0.0001 nsclock 0.3028 nssetup −0.0674 nsslack +1.0077 ns · metarrival 5.2277required 6.2354
Read the path as a table

Launch: clk rise edge at 0.0000 ns, clock latency 0.3026 ns. Capture: clk rise edge at 6.0000 ns, latency 0.3028 ns, library setup time −0.0674 ns.

Arrival 5.2277 ns, required 6.2354 ns, slack 1.0077 ns (met).

CellArcThroughEdgeDelay (ns)Time (ns)Slew (ns)
1_809_/CLK → _809_/Qdfrtp_1fall0.49990.80260.1709
_809_/Q → _607_/Awire acc[1]fall0.00090.80350.1709
2_607_/A → _607_/Yxnor2_1rise0.27591.07940.2209
_607_/Y → _619_/A2wire _080_rise0.00011.07950.2209
3_619_/A2 → _619_/Yo21ai_0fall0.17921.25870.1422
_619_/Y → _641_/Cwire _081_fall0.00031.25900.1422
4_641_/C → _641_/Xmaj3_1fall0.42681.68580.1034
_641_/X → _663_/Cwire _083_fall0.00031.68600.1034
5_663_/C → _663_/Xmaj3_1fall0.40832.09430.0988
_663_/X → _685_/Cwire _085_fall0.00022.09450.0988
6_685_/C → _685_/Xmaj3_1fall0.40652.50100.0984
_685_/X → _707_/Cwire _087_fall0.00032.50130.0984
7_707_/C → _707_/Xmaj3_1fall0.42182.92310.1124
_707_/X → _727_/A1wire _089_fall0.00042.92350.1124
8_727_/A1 → _727_/Ya211oi_1rise0.31063.23410.2979
_727_/Y → _729_/A3wire _093_rise0.00013.23420.2979
9_729_/A3 → _729_/Yo31ai_1fall0.17213.40630.1165
_729_/Y → _731_/A2wire _095_fall0.00053.40680.1165
10_731_/A2 → _731_/Xo211a_1fall0.24633.65310.0541
_731_/X → _734_/A3wire _097_fall0.00023.65330.0541
11_734_/A3 → _734_/Yo311ai_0rise0.57714.23040.6705
_734_/Y → _736_/A3wire _100_rise0.00044.23080.6705
12_736_/A3 → _736_/Ya31oi_1fall0.23914.46990.1663
_736_/Y → _737_/A2wire _101_fall0.00034.47020.1663
13_737_/A2 → _737_/Ya21oi_1rise0.32144.79160.2888
_737_/Y → _740_/A2wire _102_rise0.00044.79200.2888
14_740_/A2 → _740_/Ya211oi_1fall0.19144.98340.1343
_740_/Y → _742_/Cwire _105_fall0.00034.98370.1343
15_742_/C → _742_/Ynand3_1rise0.12895.11260.0887
_742_/Y → _748_/Bwire _107_rise0.00015.11270.0887
16_748_/B → _748_/Yxnor2_1rise0.11505.22760.1115
_748_/Y → _827_/Dwire _048_rise0.00015.22770.1115
The report
Startpoint: _809_ (rising edge-triggered flip-flop clocked by clk)
Endpoint: _827_ (rising edge-triggered flip-flop clocked by clk)
Path Group: clk
Path Type: max

Fanout       Cap      Slew     Delay      Time   Description
-------------------------------------------------------------------------------------
                              0.0000    0.0000   clock clk (rise edge)
                              0.0000    0.0000   clock source latency
     1    0.0163    0.0000    0.0000    0.0000 ^ clk (in)
                                                 clk (net)
                    0.0004    0.0002    0.0002 ^ clkbuf_0_clk/A (sky130_fd_sc_hd__clkbuf_8)
     4    0.0281    0.0632    0.1261    0.1263 ^ clkbuf_0_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_0_clk (net)
                    0.0632    0.0008    0.1272 ^ clkbuf_2_1__f_clk/A (sky130_fd_sc_hd__clkbuf_8)
    14    0.0488    0.0957    0.1733    0.3005 ^ clkbuf_2_1__f_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_2_1__leaf_clk (net)
                    0.0958    0.0022    0.3026 ^ _809_/CLK (sky130_fd_sc_hd__dfrtp_1)
     4    0.0334    0.1709    0.4999    0.8026 v _809_/Q (sky130_fd_sc_hd__dfrtp_1)
                                                 acc[1] (net)
                    0.1709    0.0009    0.8035 v _607_/A (sky130_fd_sc_hd__xnor2_1)
     2    0.0082    0.2209    0.2759    1.0794 ^ _607_/Y (sky130_fd_sc_hd__xnor2_1)
                                                 _080_ (net)
                    0.2209    0.0001    1.0795 ^ _619_/A2 (sky130_fd_sc_hd__o21ai_0)
     2    0.0098    0.1422    0.1792    1.2587 v _619_/Y (sky130_fd_sc_hd__o21ai_0)
                                                 _081_ (net)
                    0.1422    0.0003    1.2590 v _641_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0103    0.1034    0.4268    1.6858 v _641_/X (sky130_fd_sc_hd__maj3_1)
                                                 _083_ (net)
                    0.1034    0.0003    1.6860 v _663_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0093    0.0988    0.4083    2.0943 v _663_/X (sky130_fd_sc_hd__maj3_1)
                                                 _085_ (net)
                    0.0988    0.0002    2.0945 v _685_/C (sky130_fd_sc_hd__maj3_1)
     2    0.0092    0.0984    0.4065    2.5010 v _685_/X (sky130_fd_sc_hd__maj3_1)
                                                 _087_ (net)
                    0.0984    0.0003    2.5013 v _707_/C (sky130_fd_sc_hd__maj3_1)
     3    0.0123    0.1124    0.4218    2.9231 v _707_/X (sky130_fd_sc_hd__maj3_1)
                                                 _089_ (net)
                    0.1124    0.0004    2.9235 v _727_/A1 (sky130_fd_sc_hd__a211oi_1)
     2    0.0071    0.2979    0.3106    3.2341 ^ _727_/Y (sky130_fd_sc_hd__a211oi_1)
                                                 _093_ (net)
                    0.2979    0.0001    3.2342 ^ _729_/A3 (sky130_fd_sc_hd__o31ai_1)
     3    0.0122    0.1165    0.1721    3.4063 v _729_/Y (sky130_fd_sc_hd__o31ai_1)
                                                 _095_ (net)
                    0.1165    0.0005    3.4068 v _731_/A2 (sky130_fd_sc_hd__o211a_1)
     2    0.0063    0.0541    0.2463    3.6531 v _731_/X (sky130_fd_sc_hd__o211a_1)
                                                 _097_ (net)
                    0.0541    0.0002    3.6533 v _734_/A3 (sky130_fd_sc_hd__o311ai_0)
     3    0.0119    0.6705    0.5771    4.2304 ^ _734_/Y (sky130_fd_sc_hd__o311ai_0)
                                                 _100_ (net)
                    0.6705    0.0004    4.2308 ^ _736_/A3 (sky130_fd_sc_hd__a31oi_1)
     2    0.0094    0.1663    0.2391    4.4699 v _736_/Y (sky130_fd_sc_hd__a31oi_1)
                                                 _101_ (net)
                    0.1663    0.0003    4.4702 v _737_/A2 (sky130_fd_sc_hd__a21oi_1)
     3    0.0126    0.2888    0.3214    4.7916 ^ _737_/Y (sky130_fd_sc_hd__a21oi_1)
                                                 _102_ (net)
                    0.2888    0.0004    4.7920 ^ _740_/A2 (sky130_fd_sc_hd__a211oi_1)
     4    0.0133    0.1343    0.1914    4.9834 v _740_/Y (sky130_fd_sc_hd__a211oi_1)
                                                 _105_ (net)
                    0.1343    0.0003    4.9837 v _742_/C (sky130_fd_sc_hd__nand3_1)
     1    0.0049    0.0887    0.1289    5.1126 ^ _742_/Y (sky130_fd_sc_hd__nand3_1)
                                                 _107_ (net)
                    0.0887    0.0001    5.1127 ^ _748_/B (sky130_fd_sc_hd__xnor2_1)
     1    0.0025    0.1115    0.1150    5.2276 ^ _748_/Y (sky130_fd_sc_hd__xnor2_1)
                                                 _048_ (net)
                    0.1115    0.0001    5.2277 ^ _827_/D (sky130_fd_sc_hd__dfrtp_1)
                                        5.2277   data arrival time

                              6.0000    6.0000   clock clk (rise edge)
                              0.0000    6.0000   clock source latency
     1    0.0163    0.0000    0.0000    6.0000 ^ clk (in)
                                                 clk (net)
                    0.0004    0.0002    6.0002 ^ clkbuf_0_clk/A (sky130_fd_sc_hd__clkbuf_8)
     4    0.0281    0.0632    0.1261    6.1263 ^ clkbuf_0_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_0_clk (net)
                    0.0632    0.0008    6.1271 ^ clkbuf_2_2__f_clk/A (sky130_fd_sc_hd__clkbuf_8)
    14    0.0484    0.0954    0.1720    6.2991 ^ clkbuf_2_2__f_clk/X (sky130_fd_sc_hd__clkbuf_8)
                                                 clknet_2_2__leaf_clk (net)
                    0.0957    0.0037    6.3028 ^ _827_/CLK (sky130_fd_sc_hd__dfrtp_1)
                              0.0000    6.3028   clock reconvergence pessimism
                             -0.0674    6.2354   library setup time
                                        6.2354   data required time
-------------------------------------------------------------------------------------
                                        6.2354   data required time
                                       -5.2277   data arrival time
-------------------------------------------------------------------------------------
                                        1.0077   slack (MET)

The cell model changes while the extracted physical network stays fixed.

                                      Required    Actual
Pin                                      Width     Width     Slack
------------------------------------------------------------------
_820_/CLK (low)                         0.2794    2.9990    2.7196 (MET)

Cell cornerTotal negative max / min slackWorst pulse-width slackUnconstrained endpoints
tt_025C_1v800.0000 / 0.0000 ns2.7196 nsVDD, VSS
ss_100C_1v60-51.2300 / -10.8270 ns2.3845 nsVDD, VSS
ss_n40C_1v60-75.5982 / -17.9293 ns2.2759 nsVDD, VSS
ff_n40C_1v950.0000 / 0.0000 ns2.8257 nsVDD, VSS

Minimum summaries include reset removal. Supply endpoints are identified from DEF pin uses in the audit below.

The cold slow view also reports a transition violation, so closing its worst setup path alone would leave another failure. Increasing the period can improve setup without repairing removal, excessive load or an inadequate clock pulse. A matrix keeps those independent obligations visible.

Audit constraints before accepting green slack

A missing timing requirement can remove the check that would have failed; an empty report is therefore not automatically a pass. Inspect unclocked registers, missing I/O delays, unconstrained endpoints and loops using check_setup. Review every timing exception against the actual interface and operating mode.

  1. Identify every warning

    This exported MAC lists VDD and VSS as unconstrained supply endpoints. Their DEF pin uses identify them as power and ground, not timed signal outputs.

  2. Explain physical-only cells

    The fresh session sees tap cells as black boxes because they have no timing-library cell. Their pinned LEF contains only supply pins; an unexplained signal black box would be a different problem.

  3. Verify parasitic coverage

    Check missing and partially annotated drivers. The disconnected CTS load outputs identified in L6 remain explicit rather than being mistaken for missing signal networks.

  4. Record what is absent

    This block has no integrated clock-gating cell. Additional modes and validated RC corners remain required before a production sign-off claim.

The live exercise runs the slow library on the original mapped netlist with ideal wires. It lets you inspect check types and change constraints quickly, but it does not reproduce the routed sign-off matrix. Keep that representation difference beside any comparison of its slack with the figures.

Asked in interviews
  1. What goes into sign-off STA?

    Matching final connectivity, extracted parasitics, required library and RC views, clocks and constraints. The reports must cover every applicable check and operating mode.

  2. Why inspect check_setup separately?

    An unconstrained endpoint can disappear from ordinary slack summaries. Missing coverage must be explained before a positive slack can be trusted.

  3. Does fast always mean worst hold?

    No. Data paths, clock paths and library checks all change. Evaluate the required scenarios and distinguish data hold from other minimum checks.

Try it

The original mapped netlist at the cold slow corner reports -4.2052 ns worst maximum slack with ideal wires. Inspect the path type before comparing it with the routed matrix.

Raise the clock period, then inspect the minimum checks too. A longer period does not repair an ordinary same-edge removal or hold requirement.

STAOpenSTA in OpenROAD 26Q2 · sky130hd ss_n40C_1v60 Liberty · simulator service
Edit the constraints, then run them

          
Expected: WNS -4.2052 ns
Read the netlist: mac.v (the bundled design mac8)
/* Generated by Yosys 0.70+290 (git sha1 e8968a4f7, Release, Clang /usr/bin/clang++ 21.1.8) */

module mac(clk, rst_n, en, a, b, acc);
  input clk;
  wire clk;
  input rst_n;
  wire rst_n;
  input en;
  wire en;
  input [7:0] a;
  wire [7:0] a;
  input [7:0] b;
  wire [7:0] b;
  output [19:0] acc;
  wire [19:0] acc;
  wire _000_;
  wire _001_;
  wire _002_;
  wire _003_;
  wire _004_;
  wire _005_;
  wire _006_;
  wire _007_;
  wire _008_;
  wire _009_;
  wire _010_;
  wire _011_;
  wire _012_;
  wire _013_;
  wire _014_;
  wire _015_;
  wire _016_;
  wire _017_;
  wire _018_;
  wire _019_;
  wire _020_;
  wire _021_;
  wire _022_;
  wire _023_;
  wire _024_;
  wire _025_;
  wire _026_;
  wire _027_;
  wire _028_;
  wire _029_;
  wire _030_;
  wire _031_;
  wire _032_;
  wire _033_;
  wire _034_;
  wire _035_;
  wire _036_;
  wire _037_;
  wire _038_;
  wire _039_;
  wire _040_;
  wire _041_;
  wire _042_;
  wire _043_;
  wire _044_;
  wire _045_;
  wire _046_;
  wire _047_;
  wire _048_;
  wire _049_;
  wire _050_;
  wire _051_;
  wire _052_;
  wire _053_;
  wire _054_;
  wire _055_;
  wire _056_;
  wire _057_;
  wire _058_;
  wire _059_;
  wire _060_;
  wire _061_;
  wire _062_;
  wire _063_;
  wire _064_;
  wire _065_;
  wire _066_;
  wire _067_;
  wire _068_;
  wire _069_;
  wire _070_;
  wire _071_;
  wire _072_;
  wire _073_;
  wire _074_;
  wire _075_;
  wire _076_;
  wire _077_;
  wire _078_;
  wire _079_;
  wire _080_;
  wire _081_;
  wire _082_;
  wire _083_;
  wire _084_;
  wire _085_;
  wire _086_;
  wire _087_;
  wire _088_;
  wire _089_;
  wire _090_;
  wire _091_;
  wire _092_;
  wire _093_;
  wire _094_;
  wire _095_;
  wire _096_;
  wire _097_;
  wire _098_;
  wire _099_;
  wire _100_;
  wire _101_;
  wire _102_;
  wire _103_;
  wire _104_;
  wire _105_;
  wire _106_;
  wire _107_;
  wire _108_;
  wire _109_;
  wire _110_;
  wire _111_;
  wire _112_;
  wire _113_;
  wire _114_;
  wire _115_;
  wire _116_;
  wire _117_;
  wire _118_;
  wire _119_;
  wire _120_;
  wire _121_;
  wire _122_;
  wire _123_;
  wire _124_;
  wire _125_;
  wire _126_;
  wire _127_;
  wire _128_;
  wire _129_;
  wire _130_;
  wire _131_;
  wire _132_;
  wire _133_;
  wire _134_;
  wire _135_;
  wire _136_;
  wire _137_;
  wire _138_;
  wire _139_;
  wire _140_;
  wire _141_;
  wire _142_;
  wire _143_;
  wire _144_;
  wire _145_;
  wire _146_;
  wire _147_;
  wire _148_;
  wire _149_;
  wire _150_;
  wire _151_;
  wire _152_;
  wire _153_;
  wire _154_;
  wire _155_;
  wire _156_;
  wire _157_;
  wire _158_;
  wire _159_;
  wire _160_;
  wire _161_;
  wire _162_;
  wire _163_;
  wire _164_;
  wire _165_;
  wire _166_;
  wire _167_;
  wire _168_;
  wire _169_;
  wire _170_;
  wire _171_;
  wire _172_;
  wire _173_;
  wire _174_;
  wire _175_;
  wire _176_;
  wire _177_;
  wire _178_;
  wire _179_;
  wire _180_;
  wire _181_;
  wire _182_;
  wire _183_;
  wire _184_;
  wire _185_;
  wire _186_;
  wire _187_;
  wire _188_;
  wire _189_;
  wire _190_;
  wire _191_;
  wire _192_;
  wire _193_;
  wire _194_;
  wire _195_;
  wire _196_;
  wire _197_;
  wire _198_;
  wire _199_;
  wire _200_;
  wire _201_;
  wire _202_;
  wire _203_;
  wire _204_;
  wire _205_;
  wire _206_;
  wire _207_;
  wire _208_;
  wire _209_;
  wire _210_;
  wire _211_;
  wire _212_;
  wire _213_;
  wire _214_;
  wire _215_;
  wire _216_;
  wire _217_;
  wire _218_;
  wire _219_;
  wire _220_;
  wire _221_;
  wire _222_;
  wire _223_;
  wire _224_;
  wire _225_;
  wire _226_;
  wire _227_;
  wire _228_;
  wire _229_;
  wire _230_;
  wire _231_;
  wire _232_;
  wire _233_;
  wire _234_;
  wire _235_;
  wire _236_;
  wire _237_;
  wire _238_;
  wire _239_;
  wire _240_;
  wire _241_;
  wire _242_;
  wire _243_;
  wire _244_;
  wire _245_;
  wire _246_;
  wire _247_;
  wire _248_;
  wire _249_;
  wire _250_;
  wire _251_;
  wire _252_;
  wire _253_;
  wire _254_;
  wire _255_;
  wire _256_;
  wire _257_;
  wire _258_;
  wire _259_;
  wire _260_;
  wire _261_;
  wire _262_;
  wire _263_;
  wire _264_;
  wire _265_;
  wire _266_;
  wire _267_;
  wire _268_;
  wire _269_;
  wire _270_;
  wire _271_;
  wire _272_;
  wire _273_;
  wire _274_;
  wire _275_;
  wire _276_;
  wire _277_;
  wire _278_;
  wire _279_;
  wire _280_;
  wire _281_;
  wire _282_;
  wire _283_;
  wire _284_;
  wire _285_;
  wire _286_;
  wire _287_;
  wire _288_;
  wire _289_;
  wire _290_;
  wire _291_;
  wire _292_;
  wire _293_;
  wire _294_;
  wire _295_;
  wire _296_;
  wire _297_;
  wire _298_;
  wire _299_;
  wire _300_;
  wire _301_;
  wire _302_;
  wire _303_;
  wire _304_;
  wire _305_;
  wire _306_;
  wire _307_;
  wire _308_;
  wire _309_;
  wire _310_;
  wire _311_;
  wire _312_;
  wire _313_;
  wire _314_;
  wire _315_;
  wire _316_;
  wire _317_;
  wire _318_;
  wire _319_;
  wire _320_;
  wire _321_;
  wire _322_;
  wire _323_;
  wire _324_;
  wire _325_;
  wire _326_;
  wire _327_;
  wire _328_;
  wire _329_;
  wire _330_;
  wire _331_;
  wire _332_;
  wire _333_;
  wire _334_;
  wire _335_;
  wire _336_;
  wire _337_;
  wire _338_;
  wire _339_;
  wire _340_;
  wire _341_;
  wire _342_;
  wire _343_;
  wire _344_;
  wire _345_;
  wire _346_;
  wire _347_;
  wire _348_;
  wire _349_;
  wire _350_;
  wire _351_;
  wire _352_;
  wire _353_;
  wire _354_;
  wire _355_;
  wire _356_;
  wire _357_;
  wire _358_;
  wire _359_;
  wire _360_;
  wire _361_;
  wire _362_;
  wire _363_;
  wire _364_;
  wire _365_;
  wire _366_;
  wire _367_;
  wire _368_;
  wire _369_;
  wire _370_;
  wire _371_;
  wire _372_;
  wire _373_;
  wire _374_;
  wire _375_;
  wire _376_;
  wire _377_;
  wire _378_;
  wire _379_;
  wire _380_;
  wire _381_;
  wire _382_;
  wire _383_;
  wire _384_;
  wire _385_;
  wire _386_;
  wire _387_;
  wire _388_;
  wire _389_;
  wire _390_;
  wire _391_;
  wire _392_;
  wire _393_;
  wire _394_;
  wire \p[0] ;
  wire \p[10] ;
  wire \p[11] ;
  wire \p[12] ;
  wire \p[13] ;
  wire \p[14] ;
  wire \p[15] ;
  wire \p[1] ;
  wire \p[2] ;
  wire \p[3] ;
  wire \p[4] ;
  wire \p[5] ;
  wire \p[6] ;
  wire \p[7] ;
  wire \p[8] ;
  wire \p[9] ;
  wire \ra[0] ;
  wire \ra[1] ;
  wire \ra[2] ;
  wire \ra[3] ;
  wire \ra[4] ;
  wire \ra[5] ;
  wire \ra[6] ;
  wire \ra[7] ;
  wire \rb[0] ;
  wire \rb[1] ;
  wire \rb[2] ;
  wire \rb[3] ;
  wire \rb[4] ;
  wire \rb[5] ;
  wire \rb[6] ;
  wire \rb[7] ;
  sky130_fd_sc_hd__clkinv_1 _395_ (
    .A(en),
    .Y(_052_)
  );
  sky130_fd_sc_hd__clkinv_1 _396_ (
    .A(acc[16]),
    .Y(_053_)
  );
  sky130_fd_sc_hd__xnor2_1 _397_ (
    .A(acc[12]),
    .B(\p[12] ),
    .Y(_061_)
  );
  sky130_fd_sc_hd__xor3_1 _398_ (
    .A(_112_),
    .B(_145_),
    .C(_146_),
    .X(_148_)
  );
  sky130_fd_sc_hd__nand2_1 _399_ (
    .A(_144_),
    .B(_148_),
    .Y(_149_)
  );
  sky130_fd_sc_hd__nand3_1 _400_ (
    .A(\ra[7] ),
    .B(\rb[2] ),
    .C(_149_),
    .Y(_150_)
  );
  sky130_fd_sc_hd__xnor2_1 _401_ (
    .A(_115_),
    .B(_116_),
    .Y(_151_)
  );
  sky130_fd_sc_hd__nand2_1 _402_ (
    .A(\rb[7] ),
    .B(\ra[3] ),
    .Y(_152_)
  );
  sky130_fd_sc_hd__maj3_1 _403_ (
    .A(_112_),
    .B(_145_),
    .C(_146_),
    .X(_153_)
  );
  sky130_fd_sc_hd__nand2_1 _404_ (
    .A(\ra[4] ),
    .B(\rb[6] ),
    .Y(_154_)
  );
  sky130_fd_sc_hd__xnor2_1 _405_ (
    .A(_153_),
    .B(_154_),
    .Y(_155_)
  );
  sky130_fd_sc_hd__xnor2_1 _406_ (
    .A(_152_),
    .B(_155_),
    .Y(_156_)
  );
  sky130_fd_sc_hd__maj3_1 _407_ (
    .A(_150_),
    .B(_151_),
    .C(_156_),
    .X(_157_)
  );
  sky130_fd_sc_hd__clkinv_1 _408_ (
    .A(_061_),
    .Y(_062_)
  );
  sky130_fd_sc_hd__xnor2_1 _409_ (
    .A(_120_),
    .B(_124_),
    .Y(_158_)
  );
  sky130_fd_sc_hd__nor2b_1 _410_ (
    .A(_157_),
    .B_N(_158_),
    .Y(_159_)
  );
  sky130_fd_sc_hd__maj3_1 _411_ (
    .A(_152_),
    .B(_153_),
    .C(_154_),
    .X(_160_)
  );
  sky130_fd_sc_hd__xnor2_1 _412_ (
    .A(_157_),
    .B(_158_),
    .Y(_161_)
  );
  sky130_fd_sc_hd__nor2b_1 _413_ (
    .A(_160_),
    .B_N(_161_),
    .Y(_162_)
  );
  sky130_fd_sc_hd__xor2_1 _414_ (
    .A(_135_),
    .B(_136_),
    .X(_163_)
  );
  sky130_fd_sc_hd__o21a_1 _415_ (
    .A1(_159_),
    .A2(_162_),
    .B1(_163_),
    .X(_164_)
  );
  sky130_fd_sc_hd__nand2_1 _416_ (
    .A(\ra[7] ),
    .B(\rb[1] ),
    .Y(_165_)
  );
  sky130_fd_sc_hd__and2_0 _417_ (
    .A(\ra[6] ),
    .B(\rb[0] ),
    .X(_166_)
  );
  sky130_fd_sc_hd__nand2_1 _418_ (
    .A(\ra[7] ),
    .B(\rb[0] ),
    .Y(_167_)
  );
  sky130_fd_sc_hd__and2_0 _419_ (
    .A(acc[11]),
    .B(\p[11] ),
    .X(_063_)
  );
  sky130_fd_sc_hd__nand2_1 _420_ (
    .A(\ra[5] ),
    .B(\rb[2] ),
    .Y(_168_)
  );
  sky130_fd_sc_hd__maj3_1 _421_ (
    .A(_144_),
    .B(_167_),
    .C(_168_),
    .X(_169_)
  );
  sky130_fd_sc_hd__nand2_1 _422_ (
    .A(\ra[6] ),
    .B(\rb[2] ),
    .Y(_170_)
  );
  sky130_fd_sc_hd__xnor2_1 _423_ (
    .A(_165_),
    .B(_170_),
    .Y(_171_)
  );
  sky130_fd_sc_hd__nand2_1 _424_ (
    .A(\ra[3] ),
    .B(\rb[5] ),
    .Y(_172_)
  );
  sky130_fd_sc_hd__nand2_1 _425_ (
    .A(\ra[4] ),
    .B(\rb[4] ),
    .Y(_173_)
  );
  sky130_fd_sc_hd__nand2_1 _426_ (
    .A(\ra[4] ),
    .B(\rb[3] ),
    .Y(_174_)
  );
  sky130_fd_sc_hd__xor3_1 _427_ (
    .A(_147_),
    .B(_172_),
    .C(_173_),
    .X(_175_)
  );
  sky130_fd_sc_hd__maj3_1 _428_ (
    .A(_169_),
    .B(_171_),
    .C(_175_),
    .X(_176_)
  );
  sky130_fd_sc_hd__nand3_1 _429_ (
    .A(\ra[7] ),
    .B(\rb[2] ),
    .C(_144_),
    .Y(_177_)
  );
  sky130_fd_sc_hd__nand2_1 _430_ (
    .A(acc[11]),
    .B(\p[11] ),
    .Y(_064_)
  );
  sky130_fd_sc_hd__xnor2_1 _431_ (
    .A(_148_),
    .B(_177_),
    .Y(_178_)
  );
  sky130_fd_sc_hd__nand2_1 _432_ (
    .A(\rb[7] ),
    .B(\ra[2] ),
    .Y(_179_)
  );
  sky130_fd_sc_hd__maj3_1 _433_ (
    .A(_147_),
    .B(_172_),
    .C(_173_),
    .X(_180_)
  );
  sky130_fd_sc_hd__nand2_1 _434_ (
    .A(\ra[3] ),
    .B(\rb[6] ),
    .Y(_181_)
  );
  sky130_fd_sc_hd__xnor2_1 _435_ (
    .A(_180_),
    .B(_181_),
    .Y(_182_)
  );
  sky130_fd_sc_hd__xnor2_1 _436_ (
    .A(_179_),
    .B(_182_),
    .Y(_183_)
  );
  sky130_fd_sc_hd__xnor2_1 _437_ (
    .A(_176_),
    .B(_178_),
    .Y(_184_)
  );
  sky130_fd_sc_hd__maj3_1 _438_ (
    .A(_176_),
    .B(_178_),
    .C(_183_),
    .X(_185_)
  );
  sky130_fd_sc_hd__xor3_1 _439_ (
    .A(_150_),
    .B(_151_),
    .C(_156_),
    .X(_186_)
  );
  sky130_fd_sc_hd__maj3_1 _440_ (
    .A(_179_),
    .B(_180_),
    .C(_181_),
    .X(_187_)
  );
  sky130_fd_sc_hd__nor2_1 _441_ (
    .A(acc[11]),
    .B(\p[11] ),
    .Y(_065_)
  );
  sky130_fd_sc_hd__xor2_1 _442_ (
    .A(_185_),
    .B(_186_),
    .X(_188_)
  );
  sky130_fd_sc_hd__maj3_1 _443_ (
    .A(_185_),
    .B(_186_),
    .C(_187_),
    .X(_189_)
  );
  sky130_fd_sc_hd__xor2_1 _444_ (
    .A(_160_),
    .B(_161_),
    .X(_190_)
  );
  sky130_fd_sc_hd__nor2_1 _445_ (
    .A(_189_),
    .B(_190_),
    .Y(_191_)
  );
  sky130_fd_sc_hd__nand2_1 _446_ (
    .A(\ra[5] ),
    .B(\rb[0] ),
    .Y(_192_)
  );
  sky130_fd_sc_hd__and2_0 _447_ (
    .A(\ra[5] ),
    .B(\rb[1] ),
    .X(_193_)
  );
  sky130_fd_sc_hd__and2_0 _448_ (
    .A(\ra[4] ),
    .B(\rb[2] ),
    .X(_194_)
  );
  sky130_fd_sc_hd__maj3_1 _449_ (
    .A(_166_),
    .B(_193_),
    .C(_194_),
    .X(_195_)
  );
  sky130_fd_sc_hd__xnor3_1 _450_ (
    .A(_144_),
    .B(_167_),
    .C(_168_),
    .X(_196_)
  );
  sky130_fd_sc_hd__nand2_1 _451_ (
    .A(\ra[2] ),
    .B(\rb[5] ),
    .Y(_197_)
  );
  sky130_fd_sc_hd__clkinv_1 _452_ (
    .A(_065_),
    .Y(_066_)
  );
  sky130_fd_sc_hd__nand2_1 _453_ (
    .A(\ra[3] ),
    .B(\rb[4] ),
    .Y(_198_)
  );
  sky130_fd_sc_hd__nand2_1 _454_ (
    .A(\ra[3] ),
    .B(\rb[3] ),
    .Y(_199_)
  );
  sky130_fd_sc_hd__xnor3_1 _455_ (
    .A(_174_),
    .B(_197_),
    .C(_198_),
    .X(_200_)
  );
  sky130_fd_sc_hd__maj3_1 _456_ (
    .A(_195_),
    .B(_196_),
    .C(_200_),
    .X(_201_)
  );
  sky130_fd_sc_hd__xnor3_1 _457_ (
    .A(_169_),
    .B(_171_),
    .C(_175_),
    .X(_202_)
  );
  sky130_fd_sc_hd__nand2_1 _458_ (
    .A(\rb[7] ),
    .B(\ra[1] ),
    .Y(_203_)
  );
  sky130_fd_sc_hd__maj3_1 _459_ (
    .A(_174_),
    .B(_197_),
    .C(_198_),
    .X(_204_)
  );
  sky130_fd_sc_hd__nand2_1 _460_ (
    .A(\ra[2] ),
    .B(\rb[6] ),
    .Y(_205_)
  );
  sky130_fd_sc_hd__xor2_1 _461_ (
    .A(_204_),
    .B(_205_),
    .X(_206_)
  );
  sky130_fd_sc_hd__xnor2_1 _462_ (
    .A(_203_),
    .B(_206_),
    .Y(_207_)
  );
  sky130_fd_sc_hd__and2_0 _463_ (
    .A(acc[10]),
    .B(\p[10] ),
    .X(_067_)
  );
  sky130_fd_sc_hd__xor2_1 _464_ (
    .A(_201_),
    .B(_202_),
    .X(_208_)
  );
  sky130_fd_sc_hd__maj3_1 _465_ (
    .A(_201_),
    .B(_202_),
    .C(_207_),
    .X(_209_)
  );
  sky130_fd_sc_hd__xnor2_1 _466_ (
    .A(_183_),
    .B(_184_),
    .Y(_210_)
  );
  sky130_fd_sc_hd__nand2b_1 _467_ (
    .A_N(_210_),
    .B(_209_),
    .Y(_211_)
  );
  sky130_fd_sc_hd__maj3_1 _468_ (
    .A(_203_),
    .B(_204_),
    .C(_205_),
    .X(_212_)
  );
  sky130_fd_sc_hd__xnor2_1 _469_ (
    .A(_209_),
    .B(_210_),
    .Y(_213_)
  );
  sky130_fd_sc_hd__nand2b_1 _470_ (
    .A_N(_212_),
    .B(_213_),
    .Y(_214_)
  );
  sky130_fd_sc_hd__and2_0 _471_ (
    .A(_211_),
    .B(_214_),
    .X(_215_)
  );
  sky130_fd_sc_hd__xor2_1 _472_ (
    .A(_187_),
    .B(_188_),
    .X(_216_)
  );
  sky130_fd_sc_hd__nor2_1 _473_ (
    .A(_215_),
    .B(_216_),
    .Y(_217_)
  );
  sky130_fd_sc_hd__nor2_1 _474_ (
    .A(acc[10]),
    .B(\p[10] ),
    .Y(_068_)
  );
  sky130_fd_sc_hd__nand2_1 _475_ (
    .A(\ra[4] ),
    .B(\rb[1] ),
    .Y(_218_)
  );
  sky130_fd_sc_hd__and2_0 _476_ (
    .A(\ra[4] ),
    .B(\rb[0] ),
    .X(_219_)
  );
  sky130_fd_sc_hd__nand2_1 _477_ (
    .A(\ra[3] ),
    .B(\rb[2] ),
    .Y(_220_)
  );
  sky130_fd_sc_hd__maj3_1 _478_ (
    .A(_192_),
    .B(_218_),
    .C(_220_),
    .X(_221_)
  );
  sky130_fd_sc_hd__xnor3_1 _479_ (
    .A(_166_),
    .B(_193_),
    .C(_194_),
    .X(_222_)
  );
  sky130_fd_sc_hd__nand2_1 _480_ (
    .A(\ra[1] ),
    .B(\rb[5] ),
    .Y(_223_)
  );
  sky130_fd_sc_hd__nand2_1 _481_ (
    .A(\ra[2] ),
    .B(\rb[4] ),
    .Y(_224_)
  );
  sky130_fd_sc_hd__nand2_1 _482_ (
    .A(\ra[2] ),
    .B(\rb[3] ),
    .Y(_225_)
  );
  sky130_fd_sc_hd__xor3_1 _483_ (
    .A(_199_),
    .B(_223_),
    .C(_224_),
    .X(_226_)
  );
  sky130_fd_sc_hd__maj3_1 _484_ (
    .A(_221_),
    .B(_222_),
    .C(_226_),
    .X(_227_)
  );
  sky130_fd_sc_hd__nor2_1 _485_ (
    .A(_067_),
    .B(_068_),
    .Y(_069_)
  );
  sky130_fd_sc_hd__xnor3_1 _486_ (
    .A(_195_),
    .B(_196_),
    .C(_200_),
    .X(_228_)
  );
  sky130_fd_sc_hd__nand2_1 _487_ (
    .A(\rb[7] ),
    .B(\ra[0] ),
    .Y(_229_)
  );
  sky130_fd_sc_hd__maj3_1 _488_ (
    .A(_199_),
    .B(_223_),
    .C(_224_),
    .X(_230_)
  );
  sky130_fd_sc_hd__nand2_1 _489_ (
    .A(\ra[1] ),
    .B(\rb[6] ),
    .Y(_231_)
  );
  sky130_fd_sc_hd__xor3_1 _490_ (
    .A(_229_),
    .B(_230_),
    .C(_231_),
    .X(_232_)
  );
  sky130_fd_sc_hd__xnor2_1 _491_ (
    .A(_227_),
    .B(_228_),
    .Y(_233_)
  );
  sky130_fd_sc_hd__maj3_1 _492_ (
    .A(_227_),
    .B(_228_),
    .C(_232_),
    .X(_234_)
  );
  sky130_fd_sc_hd__xnor2_1 _493_ (
    .A(_207_),
    .B(_208_),
    .Y(_235_)
  );
  sky130_fd_sc_hd__nor2_1 _494_ (
    .A(_234_),
    .B(_235_),
    .Y(_236_)
  );
  sky130_fd_sc_hd__maj3_1 _495_ (
    .A(_229_),
    .B(_230_),
    .C(_231_),
    .X(_237_)
  );
  sky130_fd_sc_hd__and2_0 _496_ (
    .A(acc[9]),
    .B(\p[9] ),
    .X(_070_)
  );
  sky130_fd_sc_hd__xor3_1 _497_ (
    .A(_207_),
    .B(_208_),
    .C(_234_),
    .X(_238_)
  );
  sky130_fd_sc_hd__nor2_1 _498_ (
    .A(_237_),
    .B(_238_),
    .Y(_239_)
  );
  sky130_fd_sc_hd__nor2_1 _499_ (
    .A(_236_),
    .B(_239_),
    .Y(_240_)
  );
  sky130_fd_sc_hd__xnor2_1 _500_ (
    .A(_212_),
    .B(_213_),
    .Y(_241_)
  );
  sky130_fd_sc_hd__o21ai_0 _501_ (
    .A1(_236_),
    .A2(_239_),
    .B1(_241_),
    .Y(_242_)
  );
  sky130_fd_sc_hd__and2_0 _502_ (
    .A(\ra[3] ),
    .B(\rb[1] ),
    .X(_243_)
  );
  sky130_fd_sc_hd__nand2_1 _503_ (
    .A(\ra[3] ),
    .B(\rb[0] ),
    .Y(_244_)
  );
  sky130_fd_sc_hd__and2_0 _504_ (
    .A(\ra[2] ),
    .B(\rb[2] ),
    .X(_245_)
  );
  sky130_fd_sc_hd__maj3_1 _505_ (
    .A(_219_),
    .B(_243_),
    .C(_245_),
    .X(_246_)
  );
  sky130_fd_sc_hd__xnor3_1 _506_ (
    .A(_192_),
    .B(_218_),
    .C(_220_),
    .X(_247_)
  );
  sky130_fd_sc_hd__mux2_1 _507_ (
    .A0(\ra[7] ),
    .A1(a[7]),
    .S(en),
    .X(_051_)
  );
  sky130_fd_sc_hd__or2_0 _508_ (
    .A(acc[9]),
    .B(\p[9] ),
    .X(_071_)
  );
  sky130_fd_sc_hd__nand2_1 _509_ (
    .A(\ra[0] ),
    .B(\rb[5] ),
    .Y(_248_)
  );
  sky130_fd_sc_hd__nand2_1 _510_ (
    .A(\ra[1] ),
    .B(\rb[4] ),
    .Y(_249_)
  );
  sky130_fd_sc_hd__nand2_1 _511_ (
    .A(\ra[1] ),
    .B(\rb[3] ),
    .Y(_250_)
  );
  sky130_fd_sc_hd__xnor3_1 _512_ (
    .A(_225_),
    .B(_248_),
    .C(_249_),
    .X(_251_)
  );
  sky130_fd_sc_hd__maj3_1 _513_ (
    .A(_246_),
    .B(_247_),
    .C(_251_),
    .X(_252_)
  );
  sky130_fd_sc_hd__xnor3_1 _514_ (
    .A(_221_),
    .B(_222_),
    .C(_226_),
    .X(_253_)
  );
  sky130_fd_sc_hd__maj3_1 _515_ (
    .A(_225_),
    .B(_248_),
    .C(_249_),
    .X(_254_)
  );
  sky130_fd_sc_hd__nand2_1 _516_ (
    .A(\ra[0] ),
    .B(\rb[6] ),
    .Y(_255_)
  );
  sky130_fd_sc_hd__nor2_1 _517_ (
    .A(_254_),
    .B(_255_),
    .Y(_256_)
  );
  sky130_fd_sc_hd__xor2_1 _518_ (
    .A(_254_),
    .B(_255_),
    .X(_257_)
  );
  sky130_fd_sc_hd__nand2_1 _519_ (
    .A(acc[8]),
    .B(\p[8] ),
    .Y(_072_)
  );
  sky130_fd_sc_hd__xnor2_1 _520_ (
    .A(_252_),
    .B(_253_),
    .Y(_258_)
  );
  sky130_fd_sc_hd__maj3_1 _521_ (
    .A(_252_),
    .B(_253_),
    .C(_257_),
    .X(_259_)
  );
  sky130_fd_sc_hd__xor2_1 _522_ (
    .A(_232_),
    .B(_233_),
    .X(_260_)
  );
  sky130_fd_sc_hd__xor2_1 _523_ (
    .A(_259_),
    .B(_260_),
    .X(_261_)
  );
  sky130_fd_sc_hd__maj3_1 _524_ (
    .A(_256_),
    .B(_259_),
    .C(_260_),
    .X(_262_)
  );
  sky130_fd_sc_hd__xor2_1 _525_ (
    .A(_237_),
    .B(_238_),
    .X(_263_)
  );
  sky130_fd_sc_hd__nand2_1 _526_ (
    .A(_262_),
    .B(_263_),
    .Y(_264_)
  );
  sky130_fd_sc_hd__xnor2_1 _527_ (
    .A(_262_),
    .B(_263_),
    .Y(_265_)
  );
  sky130_fd_sc_hd__xnor2_1 _528_ (
    .A(_256_),
    .B(_261_),
    .Y(_266_)
  );
  sky130_fd_sc_hd__nand2_1 _529_ (
    .A(\ra[2] ),
    .B(\rb[1] ),
    .Y(_267_)
  );
  sky130_fd_sc_hd__nor2_1 _530_ (
    .A(acc[8]),
    .B(\p[8] ),
    .Y(_073_)
  );
  sky130_fd_sc_hd__nand2_1 _531_ (
    .A(\ra[2] ),
    .B(\rb[0] ),
    .Y(_268_)
  );
  sky130_fd_sc_hd__nand2_1 _532_ (
    .A(\ra[1] ),
    .B(\rb[2] ),
    .Y(_269_)
  );
  sky130_fd_sc_hd__xnor2_1 _533_ (
    .A(_244_),
    .B(_267_),
    .Y(_270_)
  );
  sky130_fd_sc_hd__maj3_1 _534_ (
    .A(_244_),
    .B(_267_),
    .C(_269_),
    .X(_271_)
  );
  sky130_fd_sc_hd__xnor3_1 _535_ (
    .A(_219_),
    .B(_243_),
    .C(_245_),
    .X(_272_)
  );
  sky130_fd_sc_hd__nand2_1 _536_ (
    .A(\ra[0] ),
    .B(\rb[4] ),
    .Y(_273_)
  );
  sky130_fd_sc_hd__nand2_1 _537_ (
    .A(\ra[0] ),
    .B(\rb[3] ),
    .Y(_274_)
  );
  sky130_fd_sc_hd__nor2_1 _538_ (
    .A(_250_),
    .B(_273_),
    .Y(_275_)
  );
  sky130_fd_sc_hd__xnor2_1 _539_ (
    .A(_250_),
    .B(_273_),
    .Y(_276_)
  );
  sky130_fd_sc_hd__maj3_1 _540_ (
    .A(_271_),
    .B(_272_),
    .C(_276_),
    .X(_277_)
  );
  sky130_fd_sc_hd__xor2_1 _541_ (
    .A(acc[8]),
    .B(\p[8] ),
    .X(_074_)
  );
  sky130_fd_sc_hd__clkinv_1 _542_ (
    .A(_277_),
    .Y(_278_)
  );
  sky130_fd_sc_hd__xor3_1 _543_ (
    .A(_246_),
    .B(_247_),
    .C(_251_),
    .X(_279_)
  );
  sky130_fd_sc_hd__xor2_1 _544_ (
    .A(_277_),
    .B(_279_),
    .X(_280_)
  );
  sky130_fd_sc_hd__maj3_1 _545_ (
    .A(_275_),
    .B(_278_),
    .C(_279_),
    .X(_281_)
  );
  sky130_fd_sc_hd__xnor2_1 _546_ (
    .A(_257_),
    .B(_258_),
    .Y(_282_)
  );
  sky130_fd_sc_hd__nand2_1 _547_ (
    .A(_281_),
    .B(_282_),
    .Y(_283_)
  );
  sky130_fd_sc_hd__xnor2_1 _548_ (
    .A(_281_),
    .B(_282_),
    .Y(_284_)
  );
  sky130_fd_sc_hd__nand2_1 _549_ (
    .A(\ra[1] ),
    .B(\rb[1] ),
    .Y(_285_)
  );
  sky130_fd_sc_hd__nand2_1 _550_ (
    .A(\ra[0] ),
    .B(\rb[2] ),
    .Y(_286_)
  );
  sky130_fd_sc_hd__xor2_1 _551_ (
    .A(_268_),
    .B(_285_),
    .X(_287_)
  );
  sky130_fd_sc_hd__and2_0 _552_ (
    .A(acc[7]),
    .B(\p[7] ),
    .X(_075_)
  );
  sky130_fd_sc_hd__maj3_1 _553_ (
    .A(_268_),
    .B(_285_),
    .C(_286_),
    .X(_288_)
  );
  sky130_fd_sc_hd__xnor2_1 _554_ (
    .A(_269_),
    .B(_270_),
    .Y(_289_)
  );
  sky130_fd_sc_hd__maj3_1 _555_ (
    .A(_274_),
    .B(_288_),
    .C(_289_),
    .X(_290_)
  );
  sky130_fd_sc_hd__xnor3_1 _556_ (
    .A(_271_),
    .B(_272_),
    .C(_276_),
    .X(_291_)
  );
  sky130_fd_sc_hd__nand2b_1 _557_ (
    .A_N(_290_),
    .B(_291_),
    .Y(_292_)
  );
  sky130_fd_sc_hd__xnor2_1 _558_ (
    .A(_275_),
    .B(_280_),
    .Y(_293_)
  );
  sky130_fd_sc_hd__nand2b_1 _559_ (
    .A_N(_292_),
    .B(_293_),
    .Y(_294_)
  );
  sky130_fd_sc_hd__nand2_1 _560_ (
    .A(\ra[0] ),
    .B(\rb[0] ),
    .Y(_295_)
  );
  sky130_fd_sc_hd__nand4_1 _561_ (
    .A(\ra[0] ),
    .B(\ra[1] ),
    .C(\rb[0] ),
    .D(\rb[1] ),
    .Y(_296_)
  );
  sky130_fd_sc_hd__xnor2_1 _562_ (
    .A(_286_),
    .B(_287_),
    .Y(_297_)
  );
  sky130_fd_sc_hd__nor2_1 _563_ (
    .A(acc[7]),
    .B(\p[7] ),
    .Y(_076_)
  );
  sky130_fd_sc_hd__nand2b_1 _564_ (
    .A_N(_296_),
    .B(_297_),
    .Y(_298_)
  );
  sky130_fd_sc_hd__xor3_1 _565_ (
    .A(_274_),
    .B(_288_),
    .C(_289_),
    .X(_299_)
  );
  sky130_fd_sc_hd__nor2_1 _566_ (
    .A(_298_),
    .B(_299_),
    .Y(_300_)
  );
  sky130_fd_sc_hd__nand2b_1 _567_ (
    .A_N(_291_),
    .B(_290_),
    .Y(_301_)
  );
  sky130_fd_sc_hd__and2_0 _568_ (
    .A(_292_),
    .B(_301_),
    .X(_302_)
  );
  sky130_fd_sc_hd__nand2_1 _569_ (
    .A(_300_),
    .B(_302_),
    .Y(_303_)
  );
  sky130_fd_sc_hd__xor2_1 _570_ (
    .A(_292_),
    .B(_293_),
    .X(_304_)
  );
  sky130_fd_sc_hd__nand4_1 _571_ (
    .A(_292_),
    .B(_293_),
    .C(_300_),
    .D(_301_),
    .Y(_305_)
  );
  sky130_fd_sc_hd__a21o_1 _572_ (
    .A1(_294_),
    .A2(_305_),
    .B1(_284_),
    .X(_306_)
  );
  sky130_fd_sc_hd__a21oi_1 _573_ (
    .A1(_283_),
    .A2(_306_),
    .B1(_266_),
    .Y(_307_)
  );
  sky130_fd_sc_hd__and2_0 _574_ (
    .A(acc[6]),
    .B(\p[6] ),
    .X(_077_)
  );
  sky130_fd_sc_hd__a211o_1 _575_ (
    .A1(_283_),
    .A2(_306_),
    .B1(_265_),
    .C1(_266_),
    .X(_308_)
  );
  sky130_fd_sc_hd__xor2_1 _576_ (
    .A(_240_),
    .B(_241_),
    .X(_309_)
  );
  sky130_fd_sc_hd__a21o_1 _577_ (
    .A1(_264_),
    .A2(_308_),
    .B1(_309_),
    .X(_310_)
  );
  sky130_fd_sc_hd__nand2_1 _578_ (
    .A(_242_),
    .B(_310_),
    .Y(_311_)
  );
  sky130_fd_sc_hd__xor2_1 _579_ (
    .A(_215_),
    .B(_216_),
    .X(_312_)
  );
  sky130_fd_sc_hd__a21boi_0 _580_ (
    .A1(_242_),
    .A2(_310_),
    .B1_N(_312_),
    .Y(_313_)
  );
  sky130_fd_sc_hd__xor2_1 _581_ (
    .A(_189_),
    .B(_190_),
    .X(_314_)
  );
  sky130_fd_sc_hd__o21a_1 _582_ (
    .A1(_217_),
    .A2(_313_),
    .B1(_314_),
    .X(_315_)
  );
  sky130_fd_sc_hd__nor3_1 _583_ (
    .A(_159_),
    .B(_162_),
    .C(_163_),
    .Y(_316_)
  );
  sky130_fd_sc_hd__nor2_1 _584_ (
    .A(_164_),
    .B(_316_),
    .Y(_317_)
  );
  sky130_fd_sc_hd__nand2_1 _585_ (
    .A(acc[1]),
    .B(\p[1] ),
    .Y(_078_)
  );
  sky130_fd_sc_hd__o21a_1 _586_ (
    .A1(_191_),
    .A2(_315_),
    .B1(_317_),
    .X(_318_)
  );
  sky130_fd_sc_hd__nand2_1 _587_ (
    .A(_137_),
    .B(_142_),
    .Y(_319_)
  );
  sky130_fd_sc_hd__nand2_1 _588_ (
    .A(_143_),
    .B(_319_),
    .Y(_320_)
  );
  sky130_fd_sc_hd__o21bai_1 _589_ (
    .A1(_164_),
    .A2(_318_),
    .B1_N(_320_),
    .Y(_321_)
  );
  sky130_fd_sc_hd__nand3_1 _590_ (
    .A(\ra[7] ),
    .B(\rb[7] ),
    .C(_127_),
    .Y(_322_)
  );
  sky130_fd_sc_hd__maj3_1 _591_ (
    .A(_133_),
    .B(_138_),
    .C(_140_),
    .X(_323_)
  );
  sky130_fd_sc_hd__xor2_1 _592_ (
    .A(_322_),
    .B(_323_),
    .X(_324_)
  );
  sky130_fd_sc_hd__a21o_1 _593_ (
    .A1(_143_),
    .A2(_321_),
    .B1(_324_),
    .X(_325_)
  );
  sky130_fd_sc_hd__o211ai_1 _594_ (
    .A1(_128_),
    .A2(_323_),
    .B1(\ra[7] ),
    .C1(\rb[7] ),
    .Y(_326_)
  );
  sky130_fd_sc_hd__a31oi_1 _595_ (
    .A1(en),
    .A2(_325_),
    .A3(_326_),
    .B1(_110_),
    .Y(_047_)
  );
  sky130_fd_sc_hd__nand2_1 _596_ (
    .A(acc[0]),
    .B(\p[0] ),
    .Y(_079_)
  );
  sky130_fd_sc_hd__mux2_1 _597_ (
    .A0(\rb[7] ),
    .A1(b[7]),
    .S(en),
    .X(_046_)
  );
  sky130_fd_sc_hd__mux2_1 _598_ (
    .A0(\ra[0] ),
    .A1(a[0]),
    .S(en),
    .X(_045_)
  );
  sky130_fd_sc_hd__mux2_1 _599_ (
    .A0(\ra[1] ),
    .A1(a[1]),
    .S(en),
    .X(_044_)
  );
  sky130_fd_sc_hd__mux2_1 _600_ (
    .A0(\ra[2] ),
    .A1(a[2]),
    .S(en),
    .X(_043_)
  );
  sky130_fd_sc_hd__mux2_1 _601_ (
    .A0(\ra[3] ),
    .A1(a[3]),
    .S(en),
    .X(_042_)
  );
  sky130_fd_sc_hd__mux2_1 _602_ (
    .A0(\ra[4] ),
    .A1(a[4]),
    .S(en),
    .X(_041_)
  );
  sky130_fd_sc_hd__mux2_1 _603_ (
    .A0(\ra[5] ),
    .A1(a[5]),
    .S(en),
    .X(_040_)
  );
  sky130_fd_sc_hd__mux2_1 _604_ (
    .A0(\ra[6] ),
    .A1(a[6]),
    .S(en),
    .X(_039_)
  );
  sky130_fd_sc_hd__xnor2_1 _605_ (
    .A(_062_),
    .B(_099_),
    .Y(_327_)
  );
  sky130_fd_sc_hd__nor2_1 _606_ (
    .A(en),
    .B(acc[12]),
    .Y(_328_)
  );
  sky130_fd_sc_hd__xnor2_1 _607_ (
    .A(acc[1]),
    .B(\p[1] ),
    .Y(_080_)
  );
  sky130_fd_sc_hd__a21oi_1 _608_ (
    .A1(en),
    .A2(_327_),
    .B1(_328_),
    .Y(_038_)
  );
  sky130_fd_sc_hd__xnor2_1 _609_ (
    .A(_069_),
    .B(_096_),
    .Y(_329_)
  );
  sky130_fd_sc_hd__nor2_1 _610_ (
    .A(en),
    .B(acc[10]),
    .Y(_330_)
  );
  sky130_fd_sc_hd__a21oi_1 _611_ (
    .A1(en),
    .A2(_329_),
    .B1(_330_),
    .Y(_037_)
  );
  sky130_fd_sc_hd__xnor2_1 _612_ (
    .A(_074_),
    .B(_094_),
    .Y(_331_)
  );
  sky130_fd_sc_hd__nor2_1 _613_ (
    .A(en),
    .B(acc[8]),
    .Y(_332_)
  );
  sky130_fd_sc_hd__a21oi_1 _614_ (
    .A1(en),
    .A2(_331_),
    .B1(_332_),
    .Y(_036_)
  );
  sky130_fd_sc_hd__xnor2_1 _615_ (
    .A(\p[15] ),
    .B(acc[15]),
    .Y(_333_)
  );
  sky130_fd_sc_hd__xnor2_1 _616_ (
    .A(_102_),
    .B(_333_),
    .Y(_334_)
  );
  sky130_fd_sc_hd__nor2_1 _617_ (
    .A(en),
    .B(acc[15]),
    .Y(_335_)
  );
  sky130_fd_sc_hd__nand2_1 _618_ (
    .A(\p[15] ),
    .B(acc[15]),
    .Y(_054_)
  );
  sky130_fd_sc_hd__o21ai_0 _619_ (
    .A1(_079_),
    .A2(_080_),
    .B1(_078_),
    .Y(_081_)
  );
  sky130_fd_sc_hd__a21oi_1 _620_ (
    .A1(en),
    .A2(_334_),
    .B1(_335_),
    .Y(_035_)
  );
  sky130_fd_sc_hd__xnor2_1 _621_ (
    .A(_089_),
    .B(_091_),
    .Y(_336_)
  );
  sky130_fd_sc_hd__nor2_1 _622_ (
    .A(en),
    .B(acc[6]),
    .Y(_337_)
  );
  sky130_fd_sc_hd__a21oi_1 _623_ (
    .A1(en),
    .A2(_336_),
    .B1(_337_),
    .Y(_034_)
  );
  sky130_fd_sc_hd__nor2_1 _624_ (
    .A(en),
    .B(acc[11]),
    .Y(_338_)
  );
  sky130_fd_sc_hd__nand2_1 _625_ (
    .A(_064_),
    .B(_066_),
    .Y(_339_)
  );
  sky130_fd_sc_hd__xnor2_1 _626_ (
    .A(_098_),
    .B(_339_),
    .Y(_340_)
  );
  sky130_fd_sc_hd__a21oi_1 _627_ (
    .A1(en),
    .A2(_340_),
    .B1(_338_),
    .Y(_033_)
  );
  sky130_fd_sc_hd__nor2b_1 _628_ (
    .A(en),
    .B_N(\p[14] ),
    .Y(_341_)
  );
  sky130_fd_sc_hd__nand3_1 _629_ (
    .A(_143_),
    .B(_321_),
    .C(_324_),
    .Y(_342_)
  );
  sky130_fd_sc_hd__xor2_1 _630_ (
    .A(acc[2]),
    .B(\p[2] ),
    .X(_082_)
  );
  sky130_fd_sc_hd__a31o_1 _631_ (
    .A1(en),
    .A2(_325_),
    .A3(_342_),
    .B1(_341_),
    .X(_032_)
  );
  sky130_fd_sc_hd__xnor2_1 _632_ (
    .A(_057_),
    .B(_101_),
    .Y(_343_)
  );
  sky130_fd_sc_hd__nor2_1 _633_ (
    .A(en),
    .B(acc[14]),
    .Y(_344_)
  );
  sky130_fd_sc_hd__a21oi_1 _634_ (
    .A1(en),
    .A2(_343_),
    .B1(_344_),
    .Y(_031_)
  );
  sky130_fd_sc_hd__nor2_1 _635_ (
    .A(acc[16]),
    .B(_104_),
    .Y(_345_)
  );
  sky130_fd_sc_hd__nor2_1 _636_ (
    .A(_105_),
    .B(_345_),
    .Y(_030_)
  );
  sky130_fd_sc_hd__xnor2_1 _637_ (
    .A(acc[13]),
    .B(\p[13] ),
    .Y(_346_)
  );
  sky130_fd_sc_hd__nand3_1 _638_ (
    .A(_060_),
    .B(_100_),
    .C(_346_),
    .Y(_347_)
  );
  sky130_fd_sc_hd__a21oi_1 _639_ (
    .A1(_060_),
    .A2(_100_),
    .B1(_346_),
    .Y(_348_)
  );
  sky130_fd_sc_hd__nor3b_1 _640_ (
    .A(_348_),
    .B(_052_),
    .C_N(_347_),
    .Y(_349_)
  );
  sky130_fd_sc_hd__maj3_1 _641_ (
    .A(acc[2]),
    .B(\p[2] ),
    .C(_081_),
    .X(_083_)
  );
  sky130_fd_sc_hd__a21o_1 _642_ (
    .A1(_052_),
    .A2(acc[13]),
    .B1(_349_),
    .X(_029_)
  );
  sky130_fd_sc_hd__xnor2_1 _643_ (
    .A(_079_),
    .B(_080_),
    .Y(_350_)
  );
  sky130_fd_sc_hd__nor2_1 _644_ (
    .A(en),
    .B(acc[1]),
    .Y(_351_)
  );
  sky130_fd_sc_hd__a21oi_1 _645_ (
    .A1(en),
    .A2(_350_),
    .B1(_351_),
    .Y(_028_)
  );
  sky130_fd_sc_hd__nor3b_1 _646_ (
    .A(_164_),
    .B(_318_),
    .C_N(_320_),
    .Y(_352_)
  );
  sky130_fd_sc_hd__nand2_1 _647_ (
    .A(en),
    .B(_321_),
    .Y(_353_)
  );
  sky130_fd_sc_hd__o2bb2ai_1 _648_ (
    .A1_N(_052_),
    .A2_N(\p[13] ),
    .B1(_352_),
    .B2(_353_),
    .Y(_027_)
  );
  sky130_fd_sc_hd__xnor2_1 _649_ (
    .A(_083_),
    .B(_084_),
    .Y(_354_)
  );
  sky130_fd_sc_hd__nor2_1 _650_ (
    .A(en),
    .B(acc[3]),
    .Y(_355_)
  );
  sky130_fd_sc_hd__a21oi_1 _651_ (
    .A1(en),
    .A2(_354_),
    .B1(_355_),
    .Y(_026_)
  );
  sky130_fd_sc_hd__xor2_1 _652_ (
    .A(acc[3]),
    .B(\p[3] ),
    .X(_084_)
  );
  sky130_fd_sc_hd__nand2_1 _653_ (
    .A(en),
    .B(\p[0] ),
    .Y(_356_)
  );
  sky130_fd_sc_hd__xnor2_1 _654_ (
    .A(acc[0]),
    .B(_356_),
    .Y(_025_)
  );
  sky130_fd_sc_hd__xnor2_1 _655_ (
    .A(_087_),
    .B(_088_),
    .Y(_357_)
  );
  sky130_fd_sc_hd__nor2_1 _656_ (
    .A(en),
    .B(acc[5]),
    .Y(_358_)
  );
  sky130_fd_sc_hd__a21oi_1 _657_ (
    .A1(en),
    .A2(_357_),
    .B1(_358_),
    .Y(_024_)
  );
  sky130_fd_sc_hd__nor3_1 _658_ (
    .A(_191_),
    .B(_315_),
    .C(_317_),
    .Y(_359_)
  );
  sky130_fd_sc_hd__nor3_1 _659_ (
    .A(_052_),
    .B(_318_),
    .C(_359_),
    .Y(_360_)
  );
  sky130_fd_sc_hd__a21o_1 _660_ (
    .A1(_052_),
    .A2(\p[12] ),
    .B1(_360_),
    .X(_023_)
  );
  sky130_fd_sc_hd__nor2_1 _661_ (
    .A(_075_),
    .B(_076_),
    .Y(_361_)
  );
  sky130_fd_sc_hd__xor2_1 _662_ (
    .A(_092_),
    .B(_361_),
    .X(_362_)
  );
  sky130_fd_sc_hd__maj3_1 _663_ (
    .A(acc[3]),
    .B(\p[3] ),
    .C(_083_),
    .X(_085_)
  );
  sky130_fd_sc_hd__mux2_1 _664_ (
    .A0(acc[7]),
    .A1(_362_),
    .S(en),
    .X(_022_)
  );
  sky130_fd_sc_hd__nor2b_1 _665_ (
    .A(_070_),
    .B_N(_071_),
    .Y(_363_)
  );
  sky130_fd_sc_hd__xnor2_1 _666_ (
    .A(_095_),
    .B(_363_),
    .Y(_364_)
  );
  sky130_fd_sc_hd__nor2_1 _667_ (
    .A(en),
    .B(acc[9]),
    .Y(_365_)
  );
  sky130_fd_sc_hd__a21oi_1 _668_ (
    .A1(en),
    .A2(_364_),
    .B1(_365_),
    .Y(_021_)
  );
  sky130_fd_sc_hd__xor2_1 _669_ (
    .A(acc[17]),
    .B(_105_),
    .X(_020_)
  );
  sky130_fd_sc_hd__xnor2_1 _670_ (
    .A(_081_),
    .B(_082_),
    .Y(_366_)
  );
  sky130_fd_sc_hd__nor2_1 _671_ (
    .A(en),
    .B(acc[2]),
    .Y(_367_)
  );
  sky130_fd_sc_hd__a21oi_1 _672_ (
    .A1(en),
    .A2(_366_),
    .B1(_367_),
    .Y(_019_)
  );
  sky130_fd_sc_hd__mux2_1 _673_ (
    .A0(\rb[0] ),
    .A1(b[0]),
    .S(en),
    .X(_018_)
  );
  sky130_fd_sc_hd__xor2_1 _674_ (
    .A(acc[4]),
    .B(\p[4] ),
    .X(_086_)
  );
  sky130_fd_sc_hd__mux2_1 _675_ (
    .A0(\rb[1] ),
    .A1(b[1]),
    .S(en),
    .X(_017_)
  );
  sky130_fd_sc_hd__mux2_1 _676_ (
    .A0(\rb[2] ),
    .A1(b[2]),
    .S(en),
    .X(_016_)
  );
  sky130_fd_sc_hd__mux2_1 _677_ (
    .A0(\rb[3] ),
    .A1(b[3]),
    .S(en),
    .X(_015_)
  );
  sky130_fd_sc_hd__mux2_1 _678_ (
    .A0(\rb[4] ),
    .A1(b[4]),
    .S(en),
    .X(_014_)
  );
  sky130_fd_sc_hd__mux2_1 _679_ (
    .A0(\rb[5] ),
    .A1(b[5]),
    .S(en),
    .X(_013_)
  );
  sky130_fd_sc_hd__mux2_1 _680_ (
    .A0(\rb[6] ),
    .A1(b[6]),
    .S(en),
    .X(_012_)
  );
  sky130_fd_sc_hd__nor2_1 _681_ (
    .A(en),
    .B(\p[0] ),
    .Y(_368_)
  );
  sky130_fd_sc_hd__a21oi_1 _682_ (
    .A1(en),
    .A2(_295_),
    .B1(_368_),
    .Y(_011_)
  );
  sky130_fd_sc_hd__a22oi_1 _683_ (
    .A1(\ra[1] ),
    .A2(\rb[0] ),
    .B1(\rb[1] ),
    .B2(\ra[0] ),
    .Y(_369_)
  );
  sky130_fd_sc_hd__nand2_1 _684_ (
    .A(en),
    .B(_296_),
    .Y(_370_)
  );
  sky130_fd_sc_hd__maj3_1 _685_ (
    .A(acc[4]),
    .B(\p[4] ),
    .C(_085_),
    .X(_087_)
  );
  sky130_fd_sc_hd__o2bb2ai_1 _686_ (
    .A1_N(_052_),
    .A2_N(\p[1] ),
    .B1(_369_),
    .B2(_370_),
    .Y(_010_)
  );
  sky130_fd_sc_hd__xor2_1 _687_ (
    .A(_296_),
    .B(_297_),
    .X(_371_)
  );
  sky130_fd_sc_hd__nor2_1 _688_ (
    .A(en),
    .B(\p[2] ),
    .Y(_372_)
  );
  sky130_fd_sc_hd__a21oi_1 _689_ (
    .A1(en),
    .A2(_371_),
    .B1(_372_),
    .Y(_009_)
  );
  sky130_fd_sc_hd__xnor2_1 _690_ (
    .A(_298_),
    .B(_299_),
    .Y(_373_)
  );
  sky130_fd_sc_hd__nor2_1 _691_ (
    .A(en),
    .B(\p[3] ),
    .Y(_374_)
  );
  sky130_fd_sc_hd__a21oi_1 _692_ (
    .A1(en),
    .A2(_373_),
    .B1(_374_),
    .Y(_008_)
  );
  sky130_fd_sc_hd__nor2_1 _693_ (
    .A(_300_),
    .B(_302_),
    .Y(_375_)
  );
  sky130_fd_sc_hd__nand2_1 _694_ (
    .A(en),
    .B(_303_),
    .Y(_376_)
  );
  sky130_fd_sc_hd__o2bb2ai_1 _695_ (
    .A1_N(_052_),
    .A2_N(\p[4] ),
    .B1(_375_),
    .B2(_376_),
    .Y(_007_)
  );
  sky130_fd_sc_hd__xor2_1 _696_ (
    .A(acc[5]),
    .B(\p[5] ),
    .X(_088_)
  );
  sky130_fd_sc_hd__nand2_1 _697_ (
    .A(_303_),
    .B(_304_),
    .Y(_377_)
  );
  sky130_fd_sc_hd__nand2_1 _698_ (
    .A(_305_),
    .B(_377_),
    .Y(_378_)
  );
  sky130_fd_sc_hd__nor2_1 _699_ (
    .A(en),
    .B(\p[5] ),
    .Y(_379_)
  );
  sky130_fd_sc_hd__a21oi_1 _700_ (
    .A1(en),
    .A2(_378_),
    .B1(_379_),
    .Y(_006_)
  );
  sky130_fd_sc_hd__nand3_1 _701_ (
    .A(_284_),
    .B(_294_),
    .C(_305_),
    .Y(_380_)
  );
  sky130_fd_sc_hd__a21oi_1 _702_ (
    .A1(_306_),
    .A2(_380_),
    .B1(_052_),
    .Y(_381_)
  );
  sky130_fd_sc_hd__nor2_1 _703_ (
    .A(en),
    .B(\p[6] ),
    .Y(_382_)
  );
  sky130_fd_sc_hd__nor2_1 _704_ (
    .A(_381_),
    .B(_382_),
    .Y(_005_)
  );
  sky130_fd_sc_hd__nor2_1 _705_ (
    .A(en),
    .B(\p[7] ),
    .Y(_383_)
  );
  sky130_fd_sc_hd__nand3_1 _706_ (
    .A(_266_),
    .B(_283_),
    .C(_306_),
    .Y(_384_)
  );
  sky130_fd_sc_hd__maj3_1 _707_ (
    .A(acc[5]),
    .B(\p[5] ),
    .C(_087_),
    .X(_089_)
  );
  sky130_fd_sc_hd__nand2b_1 _708_ (
    .A_N(_307_),
    .B(_384_),
    .Y(_385_)
  );
  sky130_fd_sc_hd__a21oi_1 _709_ (
    .A1(en),
    .A2(_385_),
    .B1(_383_),
    .Y(_004_)
  );
  sky130_fd_sc_hd__xor2_1 _710_ (
    .A(_265_),
    .B(_307_),
    .X(_386_)
  );
  sky130_fd_sc_hd__nor2_1 _711_ (
    .A(en),
    .B(\p[8] ),
    .Y(_387_)
  );
  sky130_fd_sc_hd__a21oi_1 _712_ (
    .A1(en),
    .A2(_386_),
    .B1(_387_),
    .Y(_003_)
  );
  sky130_fd_sc_hd__nand3_1 _713_ (
    .A(_264_),
    .B(_308_),
    .C(_309_),
    .Y(_388_)
  );
  sky130_fd_sc_hd__a21oi_1 _714_ (
    .A1(_310_),
    .A2(_388_),
    .B1(_052_),
    .Y(_389_)
  );
  sky130_fd_sc_hd__nor2_1 _715_ (
    .A(en),
    .B(\p[9] ),
    .Y(_390_)
  );
  sky130_fd_sc_hd__nor2_1 _716_ (
    .A(_389_),
    .B(_390_),
    .Y(_002_)
  );
  sky130_fd_sc_hd__xnor2_1 _717_ (
    .A(_311_),
    .B(_312_),
    .Y(_391_)
  );
  sky130_fd_sc_hd__nor2_1 _718_ (
    .A(acc[6]),
    .B(\p[6] ),
    .Y(_090_)
  );
  sky130_fd_sc_hd__nor2_1 _719_ (
    .A(en),
    .B(\p[10] ),
    .Y(_392_)
  );
  sky130_fd_sc_hd__a21oi_1 _720_ (
    .A1(en),
    .A2(_391_),
    .B1(_392_),
    .Y(_001_)
  );
  sky130_fd_sc_hd__nor3_1 _721_ (
    .A(_217_),
    .B(_313_),
    .C(_314_),
    .Y(_393_)
  );
  sky130_fd_sc_hd__nor3_1 _722_ (
    .A(_052_),
    .B(_315_),
    .C(_393_),
    .Y(_394_)
  );
  sky130_fd_sc_hd__a21o_1 _723_ (
    .A1(_052_),
    .A2(\p[11] ),
    .B1(_394_),
    .X(_000_)
  );
  sky130_fd_sc_hd__and2_0 _724_ (
    .A(\p[14] ),
    .B(acc[14]),
    .X(_055_)
  );
  sky130_fd_sc_hd__nor2_1 _725_ (
    .A(_077_),
    .B(_090_),
    .Y(_091_)
  );
  sky130_fd_sc_hd__a21o_1 _726_ (
    .A1(_089_),
    .A2(_091_),
    .B1(_077_),
    .X(_092_)
  );
  sky130_fd_sc_hd__a211oi_1 _727_ (
    .A1(_089_),
    .A2(_091_),
    .B1(_075_),
    .C1(_077_),
    .Y(_093_)
  );
  sky130_fd_sc_hd__nor2_1 _728_ (
    .A(_076_),
    .B(_093_),
    .Y(_094_)
  );
  sky130_fd_sc_hd__o31ai_1 _729_ (
    .A1(_073_),
    .A2(_076_),
    .A3(_093_),
    .B1(_072_),
    .Y(_095_)
  );
  sky130_fd_sc_hd__o21a_1 _730_ (
    .A1(_070_),
    .A2(_095_),
    .B1(_071_),
    .X(_096_)
  );
  sky130_fd_sc_hd__o211a_1 _731_ (
    .A1(_070_),
    .A2(_095_),
    .B1(_071_),
    .C1(_069_),
    .X(_097_)
  );
  sky130_fd_sc_hd__nor2_1 _732_ (
    .A(_067_),
    .B(_097_),
    .Y(_098_)
  );
  sky130_fd_sc_hd__a21oi_1 _733_ (
    .A1(_064_),
    .A2(_098_),
    .B1(_065_),
    .Y(_099_)
  );
  sky130_fd_sc_hd__o311ai_0 _734_ (
    .A1(_063_),
    .A2(_067_),
    .A3(_097_),
    .B1(_066_),
    .C1(_062_),
    .Y(_100_)
  );
  sky130_fd_sc_hd__nor2_1 _735_ (
    .A(\p[14] ),
    .B(acc[14]),
    .Y(_056_)
  );
  sky130_fd_sc_hd__a31oi_1 _736_ (
    .A1(_058_),
    .A2(_060_),
    .A3(_100_),
    .B1(_059_),
    .Y(_101_)
  );
  sky130_fd_sc_hd__a21oi_1 _737_ (
    .A1(_057_),
    .A2(_101_),
    .B1(_055_),
    .Y(_102_)
  );
  sky130_fd_sc_hd__o21ai_0 _738_ (
    .A1(\p[15] ),
    .A2(acc[15]),
    .B1(en),
    .Y(_103_)
  );
  sky130_fd_sc_hd__a21oi_1 _739_ (
    .A1(_054_),
    .A2(_102_),
    .B1(_103_),
    .Y(_104_)
  );
  sky130_fd_sc_hd__a211oi_1 _740_ (
    .A1(_054_),
    .A2(_102_),
    .B1(_103_),
    .C1(_053_),
    .Y(_105_)
  );
  sky130_fd_sc_hd__nand2_1 _741_ (
    .A(acc[17]),
    .B(_105_),
    .Y(_106_)
  );
  sky130_fd_sc_hd__nand3_1 _742_ (
    .A(acc[18]),
    .B(acc[17]),
    .C(_105_),
    .Y(_107_)
  );
  sky130_fd_sc_hd__xnor2_1 _743_ (
    .A(acc[18]),
    .B(_106_),
    .Y(_050_)
  );
  sky130_fd_sc_hd__xnor2_1 _744_ (
    .A(_085_),
    .B(_086_),
    .Y(_108_)
  );
  sky130_fd_sc_hd__nor2_1 _745_ (
    .A(en),
    .B(acc[4]),
    .Y(_109_)
  );
  sky130_fd_sc_hd__nor2_1 _746_ (
    .A(_055_),
    .B(_056_),
    .Y(_057_)
  );
  sky130_fd_sc_hd__a21oi_1 _747_ (
    .A1(en),
    .A2(_108_),
    .B1(_109_),
    .Y(_049_)
  );
  sky130_fd_sc_hd__xnor2_1 _748_ (
    .A(acc[19]),
    .B(_107_),
    .Y(_048_)
  );
  sky130_fd_sc_hd__nor2_1 _749_ (
    .A(en),
    .B(\p[15] ),
    .Y(_110_)
  );
  sky130_fd_sc_hd__nand2_1 _750_ (
    .A(\rb[7] ),
    .B(\ra[4] ),
    .Y(_111_)
  );
  sky130_fd_sc_hd__nand2_1 _751_ (
    .A(\ra[6] ),
    .B(\rb[3] ),
    .Y(_112_)
  );
  sky130_fd_sc_hd__nand2_1 _752_ (
    .A(\ra[6] ),
    .B(\rb[4] ),
    .Y(_113_)
  );
  sky130_fd_sc_hd__nand2_1 _753_ (
    .A(\ra[7] ),
    .B(\rb[3] ),
    .Y(_114_)
  );
  sky130_fd_sc_hd__nand2_1 _754_ (
    .A(\ra[5] ),
    .B(\rb[5] ),
    .Y(_115_)
  );
  sky130_fd_sc_hd__xnor2_1 _755_ (
    .A(_113_),
    .B(_114_),
    .Y(_116_)
  );
  sky130_fd_sc_hd__maj3_1 _756_ (
    .A(_113_),
    .B(_114_),
    .C(_115_),
    .X(_117_)
  );
  sky130_fd_sc_hd__nand2_1 _757_ (
    .A(acc[13]),
    .B(\p[13] ),
    .Y(_058_)
  );
  sky130_fd_sc_hd__nand2_1 _758_ (
    .A(\ra[5] ),
    .B(\rb[6] ),
    .Y(_118_)
  );
  sky130_fd_sc_hd__xnor2_1 _759_ (
    .A(_117_),
    .B(_118_),
    .Y(_119_)
  );
  sky130_fd_sc_hd__xnor2_1 _760_ (
    .A(_111_),
    .B(_119_),
    .Y(_120_)
  );
  sky130_fd_sc_hd__nand2_1 _761_ (
    .A(\ra[7] ),
    .B(\rb[5] ),
    .Y(_121_)
  );
  sky130_fd_sc_hd__nor2_1 _762_ (
    .A(_113_),
    .B(_121_),
    .Y(_122_)
  );
  sky130_fd_sc_hd__a22oi_1 _763_ (
    .A1(\ra[7] ),
    .A2(\rb[4] ),
    .B1(\rb[5] ),
    .B2(\ra[6] ),
    .Y(_123_)
  );
  sky130_fd_sc_hd__nor2_1 _764_ (
    .A(_122_),
    .B(_123_),
    .Y(_124_)
  );
  sky130_fd_sc_hd__nand2b_1 _765_ (
    .A_N(_120_),
    .B(_124_),
    .Y(_125_)
  );
  sky130_fd_sc_hd__nand2_1 _766_ (
    .A(\rb[7] ),
    .B(\ra[5] ),
    .Y(_126_)
  );
  sky130_fd_sc_hd__nand2_1 _767_ (
    .A(\ra[6] ),
    .B(\rb[6] ),
    .Y(_127_)
  );
  sky130_fd_sc_hd__nor2_1 _768_ (
    .A(acc[13]),
    .B(\p[13] ),
    .Y(_059_)
  );
  sky130_fd_sc_hd__clkinv_1 _769_ (
    .A(_127_),
    .Y(_128_)
  );
  sky130_fd_sc_hd__nor2_1 _770_ (
    .A(_122_),
    .B(_128_),
    .Y(_129_)
  );
  sky130_fd_sc_hd__nand2_1 _771_ (
    .A(\rb[6] ),
    .B(_122_),
    .Y(_130_)
  );
  sky130_fd_sc_hd__a21oi_1 _772_ (
    .A1(\rb[6] ),
    .A2(_122_),
    .B1(_129_),
    .Y(_131_)
  );
  sky130_fd_sc_hd__xnor2_1 _773_ (
    .A(_126_),
    .B(_131_),
    .Y(_132_)
  );
  sky130_fd_sc_hd__nor2b_1 _774_ (
    .A(_121_),
    .B_N(_132_),
    .Y(_133_)
  );
  sky130_fd_sc_hd__xor2_1 _775_ (
    .A(_121_),
    .B(_132_),
    .X(_134_)
  );
  sky130_fd_sc_hd__maj3_1 _776_ (
    .A(_111_),
    .B(_117_),
    .C(_118_),
    .X(_135_)
  );
  sky130_fd_sc_hd__xnor2_1 _777_ (
    .A(_125_),
    .B(_134_),
    .Y(_136_)
  );
  sky130_fd_sc_hd__maj3_1 _778_ (
    .A(_125_),
    .B(_134_),
    .C(_135_),
    .X(_137_)
  );
  sky130_fd_sc_hd__nand2_1 _779_ (
    .A(acc[12]),
    .B(\p[12] ),
    .Y(_060_)
  );
  sky130_fd_sc_hd__o21ai_0 _780_ (
    .A1(_126_),
    .A2(_129_),
    .B1(_130_),
    .Y(_138_)
  );
  sky130_fd_sc_hd__a22oi_1 _781_ (
    .A1(\rb[7] ),
    .A2(\ra[6] ),
    .B1(\rb[6] ),
    .B2(\ra[7] ),
    .Y(_139_)
  );
  sky130_fd_sc_hd__a31oi_1 _782_ (
    .A1(\ra[7] ),
    .A2(\rb[7] ),
    .A3(_128_),
    .B1(_139_),
    .Y(_140_)
  );
  sky130_fd_sc_hd__xnor2_1 _783_ (
    .A(_133_),
    .B(_140_),
    .Y(_141_)
  );
  sky130_fd_sc_hd__xor2_1 _784_ (
    .A(_138_),
    .B(_141_),
    .X(_142_)
  );
  sky130_fd_sc_hd__or2_0 _785_ (
    .A(_137_),
    .B(_142_),
    .X(_143_)
  );
  sky130_fd_sc_hd__nand2_1 _786_ (
    .A(\ra[6] ),
    .B(\rb[1] ),
    .Y(_144_)
  );
  sky130_fd_sc_hd__nand2_1 _787_ (
    .A(\ra[4] ),
    .B(\rb[5] ),
    .Y(_145_)
  );
  sky130_fd_sc_hd__nand2_1 _788_ (
    .A(\ra[5] ),
    .B(\rb[4] ),
    .Y(_146_)
  );
  sky130_fd_sc_hd__nand2_1 _789_ (
    .A(\ra[5] ),
    .B(\rb[3] ),
    .Y(_147_)
  );
  sky130_fd_sc_hd__dfrtp_1 _790_ (
    .CLK(clk),
    .D(_012_),
    .Q(\rb[6] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _791_ (
    .CLK(clk),
    .D(_046_),
    .Q(\rb[7] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _792_ (
    .CLK(clk),
    .D(_011_),
    .Q(\p[0] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _793_ (
    .CLK(clk),
    .D(_010_),
    .Q(\p[1] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _794_ (
    .CLK(clk),
    .D(_009_),
    .Q(\p[2] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _795_ (
    .CLK(clk),
    .D(_008_),
    .Q(\p[3] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _796_ (
    .CLK(clk),
    .D(_007_),
    .Q(\p[4] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _797_ (
    .CLK(clk),
    .D(_006_),
    .Q(\p[5] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _798_ (
    .CLK(clk),
    .D(_005_),
    .Q(\p[6] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _799_ (
    .CLK(clk),
    .D(_004_),
    .Q(\p[7] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _800_ (
    .CLK(clk),
    .D(_003_),
    .Q(\p[8] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _801_ (
    .CLK(clk),
    .D(_002_),
    .Q(\p[9] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _802_ (
    .CLK(clk),
    .D(_001_),
    .Q(\p[10] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _803_ (
    .CLK(clk),
    .D(_000_),
    .Q(\p[11] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _804_ (
    .CLK(clk),
    .D(_023_),
    .Q(\p[12] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _805_ (
    .CLK(clk),
    .D(_027_),
    .Q(\p[13] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _806_ (
    .CLK(clk),
    .D(_032_),
    .Q(\p[14] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _807_ (
    .CLK(clk),
    .D(_047_),
    .Q(\p[15] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _808_ (
    .CLK(clk),
    .D(_025_),
    .Q(acc[0]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _809_ (
    .CLK(clk),
    .D(_028_),
    .Q(acc[1]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _810_ (
    .CLK(clk),
    .D(_019_),
    .Q(acc[2]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _811_ (
    .CLK(clk),
    .D(_026_),
    .Q(acc[3]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _812_ (
    .CLK(clk),
    .D(_049_),
    .Q(acc[4]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _813_ (
    .CLK(clk),
    .D(_024_),
    .Q(acc[5]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _814_ (
    .CLK(clk),
    .D(_034_),
    .Q(acc[6]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _815_ (
    .CLK(clk),
    .D(_022_),
    .Q(acc[7]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _816_ (
    .CLK(clk),
    .D(_036_),
    .Q(acc[8]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _817_ (
    .CLK(clk),
    .D(_021_),
    .Q(acc[9]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _818_ (
    .CLK(clk),
    .D(_037_),
    .Q(acc[10]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _819_ (
    .CLK(clk),
    .D(_033_),
    .Q(acc[11]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _820_ (
    .CLK(clk),
    .D(_038_),
    .Q(acc[12]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _821_ (
    .CLK(clk),
    .D(_029_),
    .Q(acc[13]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _822_ (
    .CLK(clk),
    .D(_031_),
    .Q(acc[14]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _823_ (
    .CLK(clk),
    .D(_035_),
    .Q(acc[15]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _824_ (
    .CLK(clk),
    .D(_030_),
    .Q(acc[16]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _825_ (
    .CLK(clk),
    .D(_020_),
    .Q(acc[17]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _826_ (
    .CLK(clk),
    .D(_050_),
    .Q(acc[18]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _827_ (
    .CLK(clk),
    .D(_048_),
    .Q(acc[19]),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _828_ (
    .CLK(clk),
    .D(_045_),
    .Q(\ra[0] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _829_ (
    .CLK(clk),
    .D(_044_),
    .Q(\ra[1] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _830_ (
    .CLK(clk),
    .D(_043_),
    .Q(\ra[2] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _831_ (
    .CLK(clk),
    .D(_042_),
    .Q(\ra[3] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _832_ (
    .CLK(clk),
    .D(_041_),
    .Q(\ra[4] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _833_ (
    .CLK(clk),
    .D(_040_),
    .Q(\ra[5] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _834_ (
    .CLK(clk),
    .D(_039_),
    .Q(\ra[6] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _835_ (
    .CLK(clk),
    .D(_051_),
    .Q(\ra[7] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _836_ (
    .CLK(clk),
    .D(_018_),
    .Q(\rb[0] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _837_ (
    .CLK(clk),
    .D(_017_),
    .Q(\rb[1] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _838_ (
    .CLK(clk),
    .D(_016_),
    .Q(\rb[2] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _839_ (
    .CLK(clk),
    .D(_015_),
    .Q(\rb[3] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _840_ (
    .CLK(clk),
    .D(_014_),
    .Q(\rb[4] ),
    .RESET_B(rst_n)
  );
  sky130_fd_sc_hd__dfrtp_1 _841_ (
    .CLK(clk),
    .D(_013_),
    .Q(\rb[5] ),
    .RESET_B(rst_n)
  );
endmodule

Check yourself

Predict the outputRaise the live exercise’s period from 6 ns to 7 ns. What worst maximum slack does it report, in ns?
create_clock -name clk -period 7 [get_ports clk]
set_input_delay 1 -clock clk [delete_from_list [all_inputs] [get_ports clk]]
set_output_delay 1 -clock clk [all_outputs]
set_input_transition 0.1 [delete_from_list [all_inputs] [get_ports clk]]
set_load 0.02 [all_outputs]
ConceptA negative minimum slack ends at an asynchronous-reset pin. Which check should you inspect?
ConceptWhy use the same final netlist and SPEF across the cell-corner comparison?
ConceptAn endpoint has no timing requirement and no reported negative slack. What does that establish?
ConceptWhich statement accurately describes this corner experiment?

Remember

  • Keep the physical design fixed when comparing analysis views.
  • Report setup, hold, recovery, removal and electrical checks separately.
  • Audit missing constraints and parasitic annotation before accepting slack.
  • One cell corner or one RC model does not establish complete sign-off coverage.