caiyu/nextpnr
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'redist_slack' into 'redist_slack'

Browse Source 
Keep things simple by not overconstraining Fmax

See merge request eddiehung/nextpnr!15
This commit is contained in:
Eddie Hung 2018-07-29 05:58:20 +00:00
commit b884d6bcf3
1 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
common/timing.cc
View File

@ -158,13 +158,10 @@ void assign_budget(Context *ctx, bool quiet)
}
}
// If user has not specified a frequency, adjust the target frequency dynamically
// TODO(eddieh): Tune these factors
// If user has not specified a frequency, dynamically adjust the target
// frequency to be the current maximum
if (!ctx->user_freq) {
if (min_slack < 0)
ctx->target_freq = 1e12 / (default_slack - 0.95 * min_slack);
else
ctx->target_freq = 1e12 / (default_slack - 1.2 * min_slack);
ctx->target_freq = 1e12 / (default_slack - 1.2 * min_slack);
if (ctx->verbose)
log_info("minimum slack for this assign = %d, target Fmax for next update = %.2f MHz\n", min_slack,
ctx->target_freq / 1e6);