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MegaBoom clock skew

Tool: OpenSTA

Subcategory: Clock skew issue

Conversation

oharboe

I get a lot of clock skew with https://github.com/The-OpenROAD-Project/megaboom/commit/f5dd1af7841cf1c811a51206bda6f36b446ff335 

>>> report_clock_skew
Clock auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock
Latency      CRPR       Skew
prci_ctrl_domain/_0952_/CLK ^
  11.20
tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095958_/CLK ^
2185.78      0.00    -2174.58

Clock clock
No launch/capture paths found.

Clock clock_vir
No launch/capture paths found.

Clock debug_clock
Latency      CRPR       Skew
tlDM/dmInner/_0926_/CLK ^
 118.89
tlDM/dmInner/dmInner/_13930_/CLK ^
 143.67      0.00     -24.78

image

However, a simple clock skew number doesn't really tell me if the clock skew is a problem. This presentation talks about that: https://www.eng.biu.ac.il/temanad/files/2017/02/Lecture-8-CTS.pdf

The clock skew is a problem if two flip flops that have a path between them have a large clock skew. Overcompensating for clock skew is bad for power/area/performance.

Though, it is hard to believe that 2000ps clock skew isn't going to be an issue....

Looking at the max path, ignoring all the hold elements(clock skew?), it seems like a very deep logic path going from the reorder buffer, through the load store unit and back into the rename stage. I can definitely see how this needs to be flattened in synthesis.

Startpoint: tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095683_
            (rising edge-triggered flip-flop clocked by auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock)
Endpoint: tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_44863_
          (rising edge-triggered flip-flop clocked by auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock)
Path Group: auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock
Path Type: max

  Delay    Time   Description
---------------------------------------------------------
   0.00    0.00   clock auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock (rise edge)
1958.08 1958.08   clock network delay (propagated)
   0.00 1958.08 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095683_/CLK (DFFHQNx2_ASAP7_75t_R)
  82.49 2040.56 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095683_/QN (DFFHQNx2_ASAP7_75t_R)
  80.51 2121.07 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_052821_/Y (CKINVDCx20_ASAP7_75t_R)
  86.15 2207.22 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095639_/CON (HAxp5_ASAP7_75t_R)
  37.20 2244.42 v load_slew37373/Y (BUFx6f_ASAP7_75t_R)
  19.23 2263.65 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_052860_/Y (CKINVDCx9p33_ASAP7_75t_R)
  24.44 2288.08 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_064857_/Y (AND2x2_ASAP7_75t_R)
  88.61 2376.70 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095641_/CON (HAxp5_ASAP7_75t_R)
  51.73 2428.42 v max_cap29793/Y (BUFx10_ASAP7_75t_R)
  34.45 2462.87 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053096_/Y (OA222x2_ASAP7_75t_R)
  20.54 2483.41 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053100_/Y (AND5x1_ASAP7_75t_R)
  25.37 2508.78 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053118_/Y (AND3x4_ASAP7_75t_R)
  49.24 2558.02 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053120_/Y (AND2x6_ASAP7_75t_R)
  46.31 2604.33 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053122_/Y (AND4x2_ASAP7_75t_R)
  72.25 2676.58 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09441_/Y (NAND2x1_ASAP7_75t_R)
  23.28 2699.86 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09452_/Y (OA21x2_ASAP7_75t_R)
   6.13 2705.99 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09453_/Y (INVx1_ASAP7_75t_R)
  14.46 2720.45 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09455_/Y (AND4x2_ASAP7_75t_R)
  12.60 2733.05 v hold3456/Y (BUFx2_ASAP7_75t_R)
  12.42 2745.47 v hold3147/Y (BUFx2_ASAP7_75t_R)
  12.35 2757.83 v hold3457/Y (BUFx2_ASAP7_75t_R)
  12.25 2770.08 v hold2749/Y (BUFx2_ASAP7_75t_R)
  12.23 2782.31 v hold3458/Y (BUFx2_ASAP7_75t_R)
  12.22 2794.54 v hold3148/Y (BUFx2_ASAP7_75t_R)
  12.34 2806.88 v hold3459/Y (BUFx2_ASAP7_75t_R)
  12.28 2819.16 v hold2589/Y (BUFx2_ASAP7_75t_R)
  12.26 2831.41 v hold3460/Y (BUFx2_ASAP7_75t_R)
  12.22 2843.64 v hold3149/Y (BUFx2_ASAP7_75t_R)
  12.29 2855.93 v hold3461/Y (BUFx2_ASAP7_75t_R)
  12.30 2868.23 v hold2750/Y (BUFx2_ASAP7_75t_R)
  12.57 2880.80 v hold3462/Y (BUFx2_ASAP7_75t_R)
  13.60 2894.40 v hold3150/Y (BUFx2_ASAP7_75t_R)
  13.82 2908.22 v hold3463/Y (BUFx2_ASAP7_75t_R)
  27.44 2935.66 v tile_prci_domain/tile_reset_domain/boom_tile/core/_10541_/Y (AND3x4_ASAP7_75t_R)
  18.64 2954.30 v wire17733/Y (BUFx16f_ASAP7_75t_R)
  89.70 3044.00 v wire17732/Y (BUFx16f_ASAP7_75t_R)
 119.92 3163.91 v max_length17731/Y (BUFx16f_ASAP7_75t_R)
  30.15 3194.06 v wire17730/Y (BUFx16f_ASAP7_75t_R)
  91.23 3285.29 v wire17729/Y (BUFx16f_ASAP7_75t_R)
  79.50 3364.80 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139693_/Y (AND2x2_ASAP7_75t_R)
  30.15 3394.94 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139694_/Y (NAND2x2_ASAP7_75t_R)
  54.32 3449.26 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139729_/Y (AOI21x1_ASAP7_75t_R)
  27.75 3477.02 v max_cap15253/Y (BUFx12f_ASAP7_75t_R)
 108.62 3585.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267045_/CON (HAxp5_ASAP7_75t_R)
  21.51 3607.14 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139732_/Y (CKINVDCx12_ASAP7_75t_R)
  28.07 3635.22 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267043_/CON (HAxp5_ASAP7_75t_R)
  15.42 3650.63 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267017_/Y (INVx1_ASAP7_75t_R)
  53.40 3704.04 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267041_/CON (HAxp5_ASAP7_75t_R)
  35.49 3739.53 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267041_/SN (HAxp5_ASAP7_75t_R)
  31.36 3770.89 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149214_/Y (XNOR2x1_ASAP7_75t_R)
  31.07 3801.95 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149219_/Y (AND5x2_ASAP7_75t_R)
  20.78 3822.73 v wire11834/Y (BUFx12f_ASAP7_75t_R)
  81.40 3904.13 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09445_/Y (AO221x2_ASAP7_75t_R)
  25.17 3929.30 v wire11643/Y (BUFx16f_ASAP7_75t_R)
  70.74 4000.04 v wire11642/Y (BUFx16f_ASAP7_75t_R)
  84.41 4084.45 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09446_/Y (OR5x2_ASAP7_75t_R)
  15.55 4100.01 v hold2875/Y (BUFx2_ASAP7_75t_R)
  12.67 4112.67 v hold2611/Y (BUFx2_ASAP7_75t_R)
  12.70 4125.38 v hold2876/Y (BUFx2_ASAP7_75t_R)
  12.45 4137.83 v hold2489/Y (BUFx2_ASAP7_75t_R)
  12.41 4150.23 v hold2877/Y (BUFx2_ASAP7_75t_R)
  12.47 4162.71 v hold2612/Y (BUFx2_ASAP7_75t_R)
  14.28 4176.98 v hold2878/Y (BUFx2_ASAP7_75t_R)
   6.16 4183.14 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09447_/Y (INVx1_ASAP7_75t_R)
  12.17 4195.32 ^ hold2613/Y (BUFx2_ASAP7_75t_R)
  11.66 4206.97 ^ hold2490/Y (BUFx2_ASAP7_75t_R)
  11.89 4218.86 ^ hold2614/Y (BUFx2_ASAP7_75t_R)
  12.66 4231.52 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09449_/Y (AO21x1_ASAP7_75t_R)
  12.91 4244.43 ^ hold2615/Y (BUFx2_ASAP7_75t_R)
  11.74 4256.17 ^ hold2491/Y (BUFx2_ASAP7_75t_R)
  13.34 4269.51 ^ hold2616/Y (BUFx2_ASAP7_75t_R)
  21.75 4291.26 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_10540_/Y (AND3x4_ASAP7_75t_R)
  12.97 4304.23 ^ hold2753/Y (BUFx2_ASAP7_75t_R)
  12.13 4316.36 ^ hold2617/Y (BUFx2_ASAP7_75t_R)
  12.16 4328.52 ^ hold2754/Y (BUFx2_ASAP7_75t_R)
  12.13 4340.65 ^ hold2591/Y (BUFx2_ASAP7_75t_R)
  12.20 4352.86 ^ hold2755/Y (BUFx2_ASAP7_75t_R)
  12.19 4365.04 ^ hold2618/Y (BUFx2_ASAP7_75t_R)
  12.19 4377.23 ^ hold2756/Y (BUFx2_ASAP7_75t_R)
  12.13 4389.36 ^ hold2492/Y (BUFx2_ASAP7_75t_R)
  12.22 4401.58 ^ hold2757/Y (BUFx2_ASAP7_75t_R)
  12.31 4413.89 ^ hold2619/Y (BUFx2_ASAP7_75t_R)
  12.35 4426.24 ^ hold2758/Y (BUFx2_ASAP7_75t_R)
  25.20 4451.44 ^ hold2592/Y (BUFx2_ASAP7_75t_R)
  39.44 4490.88 ^ wire10835/Y (BUFx16f_ASAP7_75t_R)
 118.30 4609.18 ^ wire10834/Y (BUFx16f_ASAP7_75t_R)
  42.72 4651.90 ^ wire10832/Y (BUFx16f_ASAP7_75t_R)
  92.03 4743.92 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139741_/Y (AND3x4_ASAP7_75t_R)
 131.71 4875.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139752_/Y (XNOR2x2_ASAP7_75t_R)
  23.62 4899.25 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_200474_/Y (INVx13_ASAP7_75t_R)
  25.32 4924.57 v max_length9483/Y (BUFx16f_ASAP7_75t_R)
  70.19 4994.76 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267079_/CON (HAxp5_ASAP7_75t_R)
  16.21 5010.97 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139765_/Y (CKINVDCx6p67_ASAP7_75t_R)
  31.91 5042.88 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139770_/Y (AND3x1_ASAP7_75t_R)
 106.34 5149.23 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267049_/SN (HAxp5_ASAP7_75t_R)
  44.98 5194.21 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149221_/Y (XNOR2x1_ASAP7_75t_R)
  33.17 5227.38 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149226_/Y (AND5x2_ASAP7_75t_R)
  25.28 5252.66 v wire7254/Y (BUFx12f_ASAP7_75t_R)
  77.52 5330.18 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09462_/Y (AO221x2_ASAP7_75t_R)
  21.54 5351.72 v wire7115/Y (BUFx16f_ASAP7_75t_R)
  69.67 5421.39 v wire7114/Y (BUFx16f_ASAP7_75t_R)
  74.63 5496.02 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09468_/Y (OR4x1_ASAP7_75t_R)
  14.86 5510.88 v hold3695/Y (BUFx2_ASAP7_75t_R)
  12.38 5523.26 v hold2552/Y (BUFx2_ASAP7_75t_R)
  12.33 5535.59 v hold3696/Y (BUFx2_ASAP7_75t_R)
  12.31 5547.89 v hold2504/Y (BUFx2_ASAP7_75t_R)
  12.31 5560.21 v hold3697/Y (BUFx2_ASAP7_75t_R)
  13.56 5573.77 v hold2553/Y (BUFx2_ASAP7_75t_R)
   5.94 5579.70 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_13953_/Y (INVx1_ASAP7_75t_R)
  12.23 5591.93 ^ hold2554/Y (BUFx2_ASAP7_75t_R)
  11.66 5603.59 ^ hold2505/Y (BUFx2_ASAP7_75t_R)
  11.73 5615.32 ^ hold2555/Y (BUFx2_ASAP7_75t_R)
  28.61 5643.93 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_13955_/Y (AND4x2_ASAP7_75t_R)
  13.70 5657.64 ^ hold2883/Y (BUFx2_ASAP7_75t_R)
  11.87 5669.51 ^ hold2556/Y (BUFx2_ASAP7_75t_R)
  11.76 5681.27 ^ hold2884/Y (BUFx2_ASAP7_75t_R)
  11.68 5692.95 ^ hold2525/Y (BUFx2_ASAP7_75t_R)
  11.99 5704.94 ^ hold2885/Y (BUFx2_ASAP7_75t_R)
  12.13 5717.06 ^ hold2557/Y (BUFx2_ASAP7_75t_R)
  12.07 5729.14 ^ hold2886/Y (BUFx2_ASAP7_75t_R)
  11.83 5740.97 ^ hold2506/Y (BUFx2_ASAP7_75t_R)
  11.69 5752.66 ^ hold2887/Y (BUFx2_ASAP7_75t_R)
  11.82 5764.48 ^ hold2558/Y (BUFx2_ASAP7_75t_R)
  11.91 5776.39 ^ hold2888/Y (BUFx2_ASAP7_75t_R)
  11.94 5788.33 ^ hold2526/Y (BUFx2_ASAP7_75t_R)
  12.00 5800.33 ^ hold2889/Y (BUFx2_ASAP7_75t_R)
  16.89 5817.22 ^ hold2559/Y (BUFx2_ASAP7_75t_R)
  34.94 5852.15 ^ hold2890/Y (BUFx2_ASAP7_75t_R)
  26.15 5878.30 ^ max_length6496/Y (BUFx16f_ASAP7_75t_R)
  13.60 5891.91 ^ hold2891/Y (BUFx2_ASAP7_75t_R)
  12.02 5903.93 ^ hold2560/Y (BUFx2_ASAP7_75t_R)
  11.87 5915.80 ^ hold2892/Y (BUFx2_ASAP7_75t_R)
  11.74 5927.54 ^ hold2527/Y (BUFx2_ASAP7_75t_R)
  11.79 5939.33 ^ hold2893/Y (BUFx2_ASAP7_75t_R)
  11.81 5951.14 ^ hold2561/Y (BUFx2_ASAP7_75t_R)
  11.96 5963.09 ^ hold2894/Y (BUFx2_ASAP7_75t_R)
  11.93 5975.03 ^ hold2507/Y (BUFx2_ASAP7_75t_R)
  11.94 5986.97 ^ hold2895/Y (BUFx2_ASAP7_75t_R)
  11.87 5998.84 ^ hold2562/Y (BUFx2_ASAP7_75t_R)
  11.96 6010.80 ^ hold2896/Y (BUFx2_ASAP7_75t_R)
  11.88 6022.68 ^ hold2528/Y (BUFx2_ASAP7_75t_R)
  11.83 6034.51 ^ hold2897/Y (BUFx2_ASAP7_75t_R)
  29.92 6064.43 ^ hold2563/Y (BUFx2_ASAP7_75t_R)
  64.30 6128.72 ^ wire6494/Y (BUFx12f_ASAP7_75t_R)
  65.09 6193.82 ^ wire6493/Y (BUFx16f_ASAP7_75t_R)
  75.13 6268.94 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139772_/Y (AND2x2_ASAP7_75t_R)
  30.93 6299.88 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139794_/Y (NAND2x2_ASAP7_75t_R)
  37.31 6337.19 v max_length5802/Y (BUFx16f_ASAP7_75t_R)
  41.02 6378.21 v load_slew5800/Y (BUFx16f_ASAP7_75t_R)
  20.76 6398.97 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_145708_/Y (NOR2x1_ASAP7_75t_R)
  55.06 6454.03 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_145709_/Y (XNOR2x2_ASAP7_75t_R)
 103.05 6557.08 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_193309_/Y (NOR2x2_ASAP7_75t_R)
  50.56 6607.64 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_212054_/Y (AND2x2_ASAP7_75t_R)
  26.07 6633.71 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267110_/CON (HAxp5_ASAP7_75t_R)
  25.60 6659.31 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267110_/SN (HAxp5_ASAP7_75t_R)
  25.32 6684.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149203_/Y (XOR2x1_ASAP7_75t_R)
  58.24 6742.87 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149205_/Y (AND5x2_ASAP7_75t_R)
  57.64 6800.51 ^ wire3875/Y (BUFx16f_ASAP7_75t_R)
  78.48 6878.99 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09474_/Y (AO221x2_ASAP7_75t_R)
  34.79 6913.78 ^ wire3865/Y (BUFx16f_ASAP7_75t_R)
  56.61 6970.39 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09475_/Y (OR4x1_ASAP7_75t_R)
  13.02 6983.41 ^ hold3416/Y (BUFx2_ASAP7_75t_R)
  11.71 6995.11 ^ hold2992/Y (BUFx2_ASAP7_75t_R)
  11.65 7006.76 ^ hold3417/Y (BUFx2_ASAP7_75t_R)
  11.64 7018.40 ^ hold2679/Y (BUFx2_ASAP7_75t_R)
  11.69 7030.09 ^ hold3418/Y (BUFx2_ASAP7_75t_R)
  11.66 7041.75 ^ hold2993/Y (BUFx2_ASAP7_75t_R)
  11.77 7053.52 ^ hold3419/Y (BUFx2_ASAP7_75t_R)
  14.52 7068.04 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09476_/Y (AO22x2_ASAP7_75t_R)
  12.18 7080.22 ^ hold3699/Y (BUFx2_ASAP7_75t_R)
  11.67 7091.90 ^ hold2994/Y (BUFx2_ASAP7_75t_R)
  11.66 7103.56 ^ hold3700/Y (BUFx2_ASAP7_75t_R)
  11.73 7115.29 ^ hold2680/Y (BUFx2_ASAP7_75t_R)
  11.77 7127.06 ^ hold3701/Y (BUFx2_ASAP7_75t_R)
  11.84 7138.90 ^ hold2995/Y (BUFx2_ASAP7_75t_R)
  11.86 7150.75 ^ hold3702/Y (BUFx2_ASAP7_75t_R)
  16.27 7167.03 ^ hold3420/Y (BUFx2_ASAP7_75t_R)
   6.40 7173.43 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09477_/Y (INVx1_ASAP7_75t_R)
  12.83 7186.26 v hold2996/Y (BUFx2_ASAP7_75t_R)
  12.44 7198.70 v hold2681/Y (BUFx2_ASAP7_75t_R)
  13.05 7211.75 v hold2997/Y (BUFx2_ASAP7_75t_R)
  23.94 7235.69 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09480_/Y (AND3x4_ASAP7_75t_R)
  17.05 7252.74 v hold3703/Y (BUFx2_ASAP7_75t_R)
  13.73 7266.47 v hold2998/Y (BUFx2_ASAP7_75t_R)
  13.82 7280.29 v hold3704/Y (BUFx2_ASAP7_75t_R)
  13.62 7293.91 v hold2682/Y (BUFx2_ASAP7_75t_R)
  13.64 7307.54 v hold3705/Y (BUFx2_ASAP7_75t_R)
  13.25 7320.80 v hold2999/Y (BUFx2_ASAP7_75t_R)
  12.85 7333.65 v hold3706/Y (BUFx2_ASAP7_75t_R)
  36.78 7370.43 v hold3421/Y (BUFx2_ASAP7_75t_R)
  38.82 7409.25 v hold3707/Y (BUFx2_ASAP7_75t_R)
  15.66 7424.91 v max_length3853/Y (BUFx12f_ASAP7_75t_R)
  11.90 7436.81 v hold3708/Y (BUFx2_ASAP7_75t_R)
  12.17 7448.98 v hold3000/Y (BUFx2_ASAP7_75t_R)
  12.28 7461.26 v hold3709/Y (BUFx2_ASAP7_75t_R)
  12.32 7473.58 v hold2683/Y (BUFx2_ASAP7_75t_R)
  12.42 7486.00 v hold3710/Y (BUFx2_ASAP7_75t_R)
  12.22 7498.22 v hold3001/Y (BUFx2_ASAP7_75t_R)
  12.30 7510.52 v hold3711/Y (BUFx2_ASAP7_75t_R)
  30.05 7540.57 v hold3422/Y (BUFx2_ASAP7_75t_R)
  34.72 7575.29 v tile_prci_domain/tile_reset_domain/boom_tile/core/_14044_/Y (AND2x6_ASAP7_75t_R)
  17.31 7592.60 v hold4909/Y (BUFx2_ASAP7_75t_R)
  17.42 7610.02 v hold3002/Y (BUFx2_ASAP7_75t_R)
  17.51 7627.53 v hold4910/Y (BUFx2_ASAP7_75t_R)
  17.30 7644.84 v hold2684/Y (BUFx2_ASAP7_75t_R)
  16.93 7661.77 v hold4911/Y (BUFx2_ASAP7_75t_R)
  15.77 7677.54 v hold3003/Y (BUFx2_ASAP7_75t_R)
  14.70 7692.24 v hold4912/Y (BUFx2_ASAP7_75t_R)
  27.90 7720.14 v hold3423/Y (BUFx2_ASAP7_75t_R)
  56.26 7776.40 v wire3837/Y (BUFx16f_ASAP7_75t_R)
  43.71 7820.11 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05007_/Y (INVx1_ASAP7_75t_R)
  27.46 7847.57 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05009_/Y (OR3x4_ASAP7_75t_R)
  41.42 7889.00 ^ wire3756/Y (BUFx16f_ASAP7_75t_R)
  91.66 7980.65 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05011_/Y (CKINVDCx20_ASAP7_75t_R)
  48.71 8029.36 v wire3438/Y (BUFx12f_ASAP7_75t_R)
  70.54 8099.90 v wire3437/Y (BUFx16f_ASAP7_75t_R)
 146.90 8246.80 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25600_/Y (AND3x4_ASAP7_75t_R)
  29.19 8275.99 v max_length2710/Y (BUFx12f_ASAP7_75t_R)
  38.04 8314.04 v wire2709/Y (BUFx16f_ASAP7_75t_R)
 127.32 8441.35 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25735_/Y (AND3x4_ASAP7_75t_R)
  44.12 8485.47 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25736_/Y (AO21x2_ASAP7_75t_R)
  48.25 8533.72 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25737_/Y (AO21x2_ASAP7_75t_R)
  66.41 8600.12 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25738_/Y (AOI21x1_ASAP7_75t_R)
  40.95 8641.07 ^ max_cap481/Y (BUFx10_ASAP7_75t_R)
  12.72 8653.80 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_38380_/Y (OAI21x1_ASAP7_75t_R)
  18.12 8671.91 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_38384_/Y (AO21x1_ASAP7_75t_R)
   0.01 8671.92 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_44863_/D (DFFHQNx2_ASAP7_75t_R)
        8671.92   data arrival time

8500.00 8500.00   clock auto_prci_ctrl_domain_reset_setter_clock_in_member_allClocks_uncore_clock (rise edge)
 201.71 8701.71   clock network delay (propagated)
 -10.00 8691.71   clock uncertainty
   0.00 8691.71   clock reconvergence pessimism
        8691.71 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_44863_/CLK (DFFHQNx2_ASAP7_75t_R)
  15.71 8707.42   library setup time
        8707.42   data required time
---------------------------------------------------------
        8707.42   data required time
        -8671.92   data arrival time
---------------------------------------------------------
          35.50   slack (MET)

If I strip away everything but the logic, I get:

  Delay    Time   Description
---------------------------------------------------------
  82.49 2040.56 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095683_/QN (DFFHQNx2_ASAP7_75t_R)
  80.51 2121.07 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_052821_/Y (CKINVDCx20_ASAP7_75t_R)
  86.15 2207.22 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095639_/CON (HAxp5_ASAP7_75t_R)
  19.23 2263.65 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_052860_/Y (CKINVDCx9p33_ASAP7_75t_R)
  24.44 2288.08 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_064857_/Y (AND2x2_ASAP7_75t_R)
  88.61 2376.70 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_095641_/CON (HAxp5_ASAP7_75t_R)
  34.45 2462.87 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053096_/Y (OA222x2_ASAP7_75t_R)
  20.54 2483.41 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053100_/Y (AND5x1_ASAP7_75t_R)
  25.37 2508.78 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053118_/Y (AND3x4_ASAP7_75t_R)
  49.24 2558.02 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053120_/Y (AND2x6_ASAP7_75t_R)
  46.31 2604.33 v tile_prci_domain/tile_reset_domain/boom_tile/core/rob/_053122_/Y (AND4x2_ASAP7_75t_R)
  72.25 2676.58 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09441_/Y (NAND2x1_ASAP7_75t_R)
  23.28 2699.86 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09452_/Y (OA21x2_ASAP7_75t_R)
   6.13 2705.99 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09453_/Y (INVx1_ASAP7_75t_R)
  14.46 2720.45 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09455_/Y (AND4x2_ASAP7_75t_R)
  27.44 2935.66 v tile_prci_domain/tile_reset_domain/boom_tile/core/_10541_/Y (AND3x4_ASAP7_75t_R)
  79.50 3364.80 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139693_/Y (AND2x2_ASAP7_75t_R)
  30.15 3394.94 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139694_/Y (NAND2x2_ASAP7_75t_R)
  54.32 3449.26 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139729_/Y (AOI21x1_ASAP7_75t_R)
 108.62 3585.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267045_/CON (HAxp5_ASAP7_75t_R)
  21.51 3607.14 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139732_/Y (CKINVDCx12_ASAP7_75t_R)
  28.07 3635.22 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267043_/CON (HAxp5_ASAP7_75t_R)
  15.42 3650.63 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267017_/Y (INVx1_ASAP7_75t_R)
  53.40 3704.04 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267041_/CON (HAxp5_ASAP7_75t_R)
  35.49 3739.53 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267041_/SN (HAxp5_ASAP7_75t_R)
  31.36 3770.89 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149214_/Y (XNOR2x1_ASAP7_75t_R)
  31.07 3801.95 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149219_/Y (AND5x2_ASAP7_75t_R)
  81.40 3904.13 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09445_/Y (AO221x2_ASAP7_75t_R)
  84.41 4084.45 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09446_/Y (OR5x2_ASAP7_75t_R)
   6.16 4183.14 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09447_/Y (INVx1_ASAP7_75t_R)
  12.66 4231.52 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09449_/Y (AO21x1_ASAP7_75t_R)
  21.75 4291.26 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_10540_/Y (AND3x4_ASAP7_75t_R)
  92.03 4743.92 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139741_/Y (AND3x4_ASAP7_75t_R)
 131.71 4875.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139752_/Y (XNOR2x2_ASAP7_75t_R)
  23.62 4899.25 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_200474_/Y (INVx13_ASAP7_75t_R)
  70.19 4994.76 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267079_/CON (HAxp5_ASAP7_75t_R)
  16.21 5010.97 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139765_/Y (CKINVDCx6p67_ASAP7_75t_R)
  31.91 5042.88 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139770_/Y (AND3x1_ASAP7_75t_R)
 106.34 5149.23 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267049_/SN (HAxp5_ASAP7_75t_R)
  44.98 5194.21 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149221_/Y (XNOR2x1_ASAP7_75t_R)
  33.17 5227.38 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149226_/Y (AND5x2_ASAP7_75t_R)
  77.52 5330.18 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09462_/Y (AO221x2_ASAP7_75t_R)
  74.63 5496.02 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09468_/Y (OR4x1_ASAP7_75t_R)
   5.94 5579.70 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_13953_/Y (INVx1_ASAP7_75t_R)
  28.61 5643.93 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_13955_/Y (AND4x2_ASAP7_75t_R)
  75.13 6268.94 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139772_/Y (AND2x2_ASAP7_75t_R)
  30.93 6299.88 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_139794_/Y (NAND2x2_ASAP7_75t_R)
  20.76 6398.97 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_145708_/Y (NOR2x1_ASAP7_75t_R)
  55.06 6454.03 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_145709_/Y (XNOR2x2_ASAP7_75t_R)
 103.05 6557.08 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_193309_/Y (NOR2x2_ASAP7_75t_R)
  50.56 6607.64 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_212054_/Y (AND2x2_ASAP7_75t_R)
  26.07 6633.71 v tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267110_/CON (HAxp5_ASAP7_75t_R)
  25.60 6659.31 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_267110_/SN (HAxp5_ASAP7_75t_R)
  25.32 6684.63 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149203_/Y (XOR2x1_ASAP7_75t_R)
  58.24 6742.87 ^ tile_prci_domain/tile_reset_domain/boom_tile/lsu/_149205_/Y (AND5x2_ASAP7_75t_R)
  78.48 6878.99 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09474_/Y (AO221x2_ASAP7_75t_R)
  56.61 6970.39 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09475_/Y (OR4x1_ASAP7_75t_R)
  14.52 7068.04 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/_09476_/Y (AO22x2_ASAP7_75t_R)
   6.40 7173.43 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09477_/Y (INVx1_ASAP7_75t_R)
  23.94 7235.69 v tile_prci_domain/tile_reset_domain/boom_tile/core/_09480_/Y (AND3x4_ASAP7_75t_R)
  34.72 7575.29 v tile_prci_domain/tile_reset_domain/boom_tile/core/_14044_/Y (AND2x6_ASAP7_75t_R)
  43.71 7820.11 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05007_/Y (INVx1_ASAP7_75t_R)
  27.46 7847.57 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05009_/Y (OR3x4_ASAP7_75t_R)
  91.66 7980.65 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/_05011_/Y (CKINVDCx20_ASAP7_75t_R)
 146.90 8246.80 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25600_/Y (AND3x4_ASAP7_75t_R)
 127.32 8441.35 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25735_/Y (AND3x4_ASAP7_75t_R)
  44.12 8485.47 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25736_/Y (AO21x2_ASAP7_75t_R)
  48.25 8533.72 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25737_/Y (AO21x2_ASAP7_75t_R)
  66.41 8600.12 ^ tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_25738_/Y (AOI21x1_ASAP7_75t_R)
  12.72 8653.80 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_38380_/Y (OAI21x1_ASAP7_75t_R)
  18.12 8671.91 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_38384_/Y (AO21x1_ASAP7_75t_R)
   0.01 8671.92 v tile_prci_domain/tile_reset_domain/boom_tile/core/rename_stage/freelist/_44863_/D (DFFHQNx2_ASAP7_75t_R)

This is a delay of 70 levels of logic yielding 3445.12ps. The fanout of a number of these levels are in the 10-20 range.

oharboe

@precisionmoon FYI

maliberty

The reported clock skew from sta considers only ff that have a path between them.