( ESNUG 285 Item 8 ) ----------------------------------------------- [4/3/98]
From: Jean-Marc Allard <jm.allard@hol.fr>
Subject: Need Help With Synopsys In-Place Optimisation (IPO) Technique
John,
I want to fix design rule violations (max_capacitance and max transition)
on a backannoted design using synopsys IPO (in place optimisation). I only
want to allow cell swapping, from low drive to higher drive. I have about
100 violations and synopsys swaps about 1000 cells. I do not understand
why so many cells are swapped. I notice that few cells are replaced with
a lower drive cell. My script is the following:
compile_ignore_footprint_during_inplace_opt = TRUE
compile_ignore_area_during_inplace_opt = TRUE
compile_disable_area_opt_during_inplace_opt = TRUE
reoptimize_design_disable_area_opt_during_postlayout_opt = TRUE
compile_ok_to_buffer_during_inplace_opt = FALSE
reoptimize_design_changed_list_file_name =
reports_be/ipo_swapped_cells.txt
reoptimize_design -in_place -only_design_rule
What am I doing wrong here?
- Jean-Marc Allard
HOL
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