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Improve timing and placement tuning in flow scripts (specifically in Nangate45) #9824

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Improve timing and placement tuning in flow scripts (specifically in Nangate45) #9824

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Improve UPF flow: timing and placement tuning in Nangate45
Waleed99i Mar 19, 2026
93c2bbc
Incidentally pushed old files , now modified the one to which I got t…
Waleed99i Mar 19, 2026
5f991da
removed -skip_gate_cloning initially but in my final report , I got r…
Waleed99i Mar 19, 2026
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4 changes: 2 additions & 2 deletions test/flow.tcl
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ set_propagated_clock [all_clocks]

# Global routing is fast enough for the flow regressions.
# It is NOT FAST ENOUGH FOR PRODUCTION USE.
set repair_timing_use_grt_parasitics 0
set repair_timing_use_grt_parasitics 1
if { $repair_timing_use_grt_parasitics } {
# Global route for parasitics - no guide file requied
global_route -congestion_iterations 100
Expand All @@ -138,7 +138,7 @@ if { $repair_timing_use_grt_parasitics } {
estimate_parasitics -placement
}

repair_timing -skip_gate_cloning
repair_timing -skip_gate_cloning -max_buffer_percent 50 -max_utilization 80

# Post timing repair.
report_worst_slack -min -digits 3
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1 change: 1 addition & 0 deletions test/gcd_nangate45.tcl
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Expand Up @@ -10,4 +10,5 @@ set sdc_file "gcd_nangate45.sdc"
set die_area {0 0 100.13 100.8}
set core_area {10.07 11.2 90.25 91}

set global_place_density 0.4
include -echo "flow.tcl"
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