hold time violation on nangate45/swerv

[ttok9]

hi, everyone. I try to make nangate45/swerv.
I defined parameters like this on config.mk
export CAP_MARGIN = 60
export SLEW_MARGIN = 40
export PL_RESIZER_HOLD_MAX_BUFFER_PERCENT = 70
export PL_RESIZER_HOLD_SLACK_MARGIN = 0.8
export GLB_RESIZER_HOLD_MAX_BUFFER_PERCENT = 70
export GLB_RESIZER_HOLD_SLACK_MARGIN = 0.8
but there are hold time violation on final result.

This is default config.mk version hold violation

This is modified version.
I modified config.mk for fix hold violation and slew, cap violation..
How can I fix hold violation? Thanks for any help!

[vijayank88]

Follow instruction and attach make place_issue test case here: https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/issues/new?assignees=&labels=&projects=&template=bug_report_with_orfs.yml

[ttok9]

make place_issue seems to not work.. How can I make it?

[vijayank88]

ok. its nangate45/swerv design? Have you changed anything wrt., source files/configuration?

[ttok9]

Oh I made cts_issue and place_issue. Thank you! But tar size is too big to upload there..(389mb) I changed only config.mk(CAP margin, etc) and constraint file(clk speed)!

[ttok9]

export CAP_MARGIN = 60
export SLEW_MARGIN = 40
export PL_RESIZER_HOLD_MAX_BUFFER_PERCENT = 70
export PL_RESIZER_HOLD_SLACK_MARGIN = 0.8
export GLB_RESIZER_HOLD_MAX_BUFFER_PERCENT = 70
export GLB_RESIZER_HOLD_SLACK_MARGIN = 0.8
config.mk
and clk_period 400 on constraint.sdc

[vvbandeira]

@ttok9
This design is expected to have some hold violations with the default values, see here:

OpenROAD-flow-scripts/flow/designs/nangate45/swerv/metadata-base-ok.json

Line 177 in e8bb324

"finish__timing__drv__hold_violation_count": 236,

Please file an Issue (not a discussion) and fill in all relevant and required fields in the issue form.

[maliberty]

You are using OL variables in ORFS where they will have no effect. There is already a nangate45/swerv (and swerv_wrapper). What is the goal here?