The-OpenROAD-Project
cts not honoring fanout limits
Describe the bug
CTS does not appear to be honoring fanout limits in ihp130.
Pin Limit Fanout Slack
---------------------------------------------------------
clkbuf_leaf_11_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_12_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_16_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_29_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_41_clk/X 8 14 -6 (VIOLATED)
Expected Behavior
No DRV violations from CTS
Environment
Jenkins CI runner
To Reproduce
aes with ihp130 from ORFS (in jenkins CI so should be reprodusable)
Relevant log output
Pin Limit Fanout Slack
---------------------------------------------------------
clkbuf_leaf_11_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_12_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_16_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_29_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_41_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_9_clk/X 8 14 -6 (VIOLATED)
clkbuf_leaf_13_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_17_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_20_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_28_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_40_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_48_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_53_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_55_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_5_clk/X 8 13 -5 (VIOLATED)
clkbuf_leaf_19_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_22_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_23_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_25_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_35_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_46_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_54_clk/X 8 12 -4 (VIOLATED)
clkbuf_leaf_0_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_15_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_1_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_21_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_34_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_52_clk/X 8 11 -3 (VIOLATED)
clkbuf_leaf_57_clk/X 8 11 -3 (VIOLATED)
clkbuf_3_1_0_clk/X 8 10 -2 (VIOLATED)
clkbuf_3_2_0_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_10_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_2_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_32_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_38_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_39_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_45_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_51_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_7_clk/X 8 10 -2 (VIOLATED)
clkbuf_leaf_8_clk/X 8 10 -2 (VIOLATED)
clkbuf_3_0_0_clk/X 8 9 (VIOLATED)
clkbuf_3_6_0_clk/X 8 9 (VIOLATED)
clkbuf_leaf_30_clk/X 8 9 (VIOLATED)
clkbuf_leaf_31_clk/X 8 9 (VIOLATED)
clkbuf_leaf_33_clk/X 8 9 (VIOLATED)
clkbuf_leaf_3_clk/X 8 9 (VIOLATED)
clkbuf_leaf_42_clk/X 8 9 (VIOLATED)
Screenshots
No response
Additional Context
No response
I don't see such errors in the latest CI (https://jenkins.openroad.tools/blue/rest/organizations/jenkins/pipelines/OpenROAD-flow-scripts-Nightly-Public/runs/4174/nodes/1246/log/?start=0)
@maliberty it's in the timing report (for CTS) in the uploaded artifacts (I'm not sure why the CI is not showing the timing in the log). I'm sorry I should have mentioned that in the original post.
https://jenkins.openroad.tools/job/OpenROAD-flow-scripts-Public/job/public_tests_all/job/master/1285/artifact/flow/final_report_aes_ihp-sg13g2_base_2024-06-28_14-31.tar.gz
@precisionmoon I don't see anything in CTS that checks max fanout. I tried setting export CTS_CLUSTER_SIZE = 8 but that only fixes the leaf clusters and violations remain higher in the tree.