hi - i had some hold violations that were resolved...
# openlanea
andrew foote
03/19/2022, 8:57 PMhi - i had some hold violations that were resolved by increasing
PL_RESIZER_HOLD_SLACK_MARGINandrew foote
03/19/2022, 8:58 PMsnippet from reports/routing/26-parasitics_sta.min.rpt:
Copy code
===========================================================================
report_checks -path_delay min (Hold)
============================================================================
Startpoint: wb_data_i[4] (input port clocked by wb_clock_i)
Endpoint: _22900_ (rising edge-triggered flip-flop clocked by wb_clock_i)
Path Group: wb_clock_i
Path Type: min
Fanout Cap Slew Delay Time Description
-----------------------------------------------------------------------------
0.00 0.00 clock wb_clock_i (rise edge)
0.00 0.00 clock network delay (propagated)
2.00 2.00 v input external delay
0.03 0.02 2.02 v wb_data_i[4] (in)
2 0.01 wb_data_i[4] (net)
0.03 0.00 2.02 v hold79/A (sky130_fd_sc_hd__clkdlybuf4s50_1)
0.10 0.44 2.46 v hold79/X (sky130_fd_sc_hd__clkdlybuf4s50_1)
1 0.01 net341 (net)
0.10 0.00 2.46 v input16/A (sky130_fd_sc_hd__buf_12)
0.02 0.14 2.60 v input16/X (sky130_fd_sc_hd__buf_12)
1 0.01 net16 (net)
0.02 0.00 2.60 v hold78/A (sky130_fd_sc_hd__buf_12)
0.09 0.15 2.74 v hold78/X (sky130_fd_sc_hd__buf_12)
8 0.17 net340 (net)
0.10 0.02 2.77 v _15792_/A (sky130_fd_sc_hd__buf_8)
0.08 0.18 2.95 v _15792_/X (sky130_fd_sc_hd__buf_8)
10 0.10 _03298_ (net)
0.08 0.01 2.96 v _16441_/A (sky130_fd_sc_hd__buf_2)
0.07 0.17 3.13 v _16441_/X (sky130_fd_sc_hd__buf_2)
5 0.03 _03699_ (net)
0.07 0.00 3.13 v _16759_/A (sky130_fd_sc_hd__clkbuf_2)
0.08 0.15 3.28 v _16759_/X (sky130_fd_sc_hd__clkbuf_2)
5 0.02 _03893_ (net)
0.08 0.00 3.28 v _16837_/A0 (sky130_fd_sc_hd__mux2_1)
0.05 0.28 3.56 v _16837_/X (sky130_fd_sc_hd__mux2_1)
1 0.00 _03939_ (net)
0.05 0.00 3.56 v _16838_/A (sky130_fd_sc_hd__clkbuf_1)
0.02 0.08 3.64 v _16838_/X (sky130_fd_sc_hd__clkbuf_1)
1 0.00 _01026_ (net)
0.02 0.00 3.64 v _22900_/D (sky130_fd_sc_hd__dfxtp_2)
3.64 data arrival time
0.00 0.00 clock wb_clock_i (rise edge)
0.00 0.00 clock source latency
0.53 0.39 0.39 ^ wb_clock_i (in)
2 0.12 wb_clock_i (net)
0.53 0.00 0.39 ^ clkbuf_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_16)
0.06 0.27 0.65 ^ clkbuf_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_16)
4 0.03 clknet_0_wb_clock_i (net)
0.06 0.00 0.66 ^ clkbuf_1_1_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.09 0.15 0.81 ^ clkbuf_1_1_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
1 0.02 clknet_1_1_0_wb_clock_i (net)
0.09 0.00 0.81 ^ clkbuf_1_1_1_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.27 0.29 1.10 ^ clkbuf_1_1_1_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
4 0.05 clknet_1_1_1_wb_clock_i (net)
0.27 0.00 1.10 ^ clkbuf_2_2_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.07 0.20 1.30 ^ clkbuf_2_2_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
1 0.01 clknet_2_2_0_wb_clock_i (net)
0.07 0.00 1.30 ^ clkbuf_2_2_1_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.27 0.28 1.59 ^ clkbuf_2_2_1_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
4 0.05 clknet_2_2_1_wb_clock_i (net)
0.27 0.00 1.59 ^ clkbuf_3_5_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.20 0.29 1.89 ^ clkbuf_3_5_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
4 0.04 clknet_3_5_0_wb_clock_i (net)
0.20 0.00 1.89 ^ clkbuf_4_10_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.17 0.25 2.14 ^ clkbuf_4_10_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
4 0.03 clknet_4_10_0_wb_clock_i (net)
0.17 0.00 2.14 ^ clkbuf_5_21_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.12 0.21 2.35 ^ clkbuf_5_21_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
4 0.02 clknet_5_21_0_wb_clock_i (net)
0.12 0.00 2.35 ^ clkbuf_6_43_0_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_2)
0.74 0.64 2.99 ^ clkbuf_6_43_0_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_2)
20 0.14 clknet_6_43_0_wb_clock_i (net)
0.74 0.01 3.00 ^ clkbuf_leaf_341_wb_clock_i/A (sky130_fd_sc_hd__clkbuf_16)
0.07 0.30 3.30 ^ clkbuf_leaf_341_wb_clock_i/X (sky130_fd_sc_hd__clkbuf_16)
11 0.04 clknet_leaf_341_wb_clock_i (net)
0.07 0.00 3.30 ^ _22900_/CLK (sky130_fd_sc_hd__dfxtp_2)
0.25 3.55 clock uncertainty
0.00 3.55 clock reconvergence pessimism
-0.03 3.52 library hold time
3.52 data required time
-----------------------------------------------------------------------------
3.52 data required time
-3.64 data arrival time
-----------------------------------------------------------------------------
0.12 slack (MET)a
Arman Avetisyan
03/19/2022, 9:02 PM1. its reports for hold (min delay)
2. The network delay is clearly shown, see the hold fixing buffers, etc. The propogated clock delay is I would assume a constraint, not the actual network delay
a
andrew foote
03/19/2022, 10:01 PMthanks!
the report above is just one example, i see the same for all paths (min & max).
i did see that there's a lot buffers & delays that are accounted for in the path, just a bit confused about the 'clock network delay' row and how that relates.
a
Arman Avetisyan
03/20/2022, 5:34 AMIt's Input to register timing path. There is no launch clock delay, since it's an input with delay set by constaints