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ice40: Add noglobal attribute and raise promotion threshold 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2026-07-24 10:55:23 +02:00
parent da46844ca6
commit 6b1da08d81
2 changed files with 5 additions and 4 deletions
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1
ice40/constids.inc
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@ -615,3 +615,4 @@ X(u2k)
X(u4k)
X(up3k)
X(up5k)
X(noglobal)

8
ice40/pack.cc
View File

@ -680,13 +680,13 @@ static void insert_global(Context *ctx, NetInfo *net, bool is_reset, bool is_cen
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;
const int logic_fanout_thresh = 40;
const int enable_fanout_thresh = 40;
const int reset_fanout_thresh = 40;
std::map<IdString, int> clock_count, reset_count, cen_count, logic_count;
for (auto &net : ctx->nets) {
NetInfo *ni = net.second.get();
if (ni->driver.cell != nullptr && !ctx->is_global_net(ni)) {
if (ni->driver.cell != nullptr && !ctx->is_global_net(ni) && !bool_or_default(ni->attrs, id_noglobal)) {
clock_count[net.first] = 0;
reset_count[net.first] = 0;
cen_count[net.first] = 0;