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ice40: add reset global promotion threshold.

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This commit is contained in:
whitequark 2018-12-04 07:40:55 +00:00
parent 6e728c9a9b
commit 7fad6058bd
1 changed files with 3 additions and 1 deletions
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4
ice40/pack.cc
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@ -569,6 +569,7 @@ static void promote_globals(Context *ctx)
log_info("Promoting globals..\n");
const int logic_fanout_thresh = 15;
const int enable_fanout_thresh = 15;
const int reset_fanout_thresh = 15;
std::map<IdString, int> clock_count, reset_count, cen_count, logic_count;
for (auto net : sorted(ctx->nets)) {
NetInfo *ni = net.second;
@ -650,7 +651,8 @@ static void promote_globals(Context *ctx)
reset_count.erase(logicnet->name);
cen_count.erase(logicnet->name);
logic_count.erase(logicnet->name);
} else if (global_reset->second > global_clock->second && prom_resets < resets_available) {
} else if (global_reset->second > global_clock->second && prom_resets < resets_available &&
global_reset->second > reset_fanout_thresh) {
NetInfo *rstnet = ctx->nets[global_reset->first].get();
insert_global(ctx, rstnet, true, false, false, global_reset->second);
++prom_globals;