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gowin: Update segment router

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Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat
2026-05-13 16:12:56 +02:00
parent 3a83235f91
commit 12c5a8eebd
1 changed files with 10 additions and 11 deletions
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21
himbaechel/uarch/gowin/globals.cc
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@@ -677,18 +677,17 @@ struct GowinGlobalRouter
if (ctx->debug) {
log_info(" step 0: %s -> %s\n", ctx->nameOfWire(lbo_wire), ctx->nameOfWire(dst_wire));
}
// The DFF can currently only connect to a neighbouring LUT. Skip such networks.
// The DFF might connect to a neighbouring LUT. Skip such networks.
if (ctx->getWireName(dst_wire)[1].in(id_XD0, id_XD1, id_XD2, id_XD3, id_XD4, id_XD5)) {
auto pips = ctx->getPipsUphill(dst_wire);
auto pip_it = pips.begin();
++pip_it;
NPNR_ASSERT_MSG(!(pip_it != pips.end()), "DFFs have been given the ability to connect independently of the "
"neighbouring LUT. Segment routing must be corrected.\n");
// Connect LUT OUT to DFF IN
PipId pip = *pips.begin();
ctx->bindPip(pip, ni, STRENGTH_LOCKED);
bound_pips.push_back(pip);
return SEG_ROUTED_TO_ANOTHER_SEGMENT;
for (auto pip : ctx->getPipsUphill(dst_wire)) {
WireId src_wire = ctx->getPipSrcWire(pip);
if (src_wire == ctx->getNetinfoSourceWire(ni)) {
// Connect LUT OUT to DFF IN
ctx->bindPip(pip, ni, STRENGTH_LOCKED);
bound_pips.push_back(pip);
return SEG_ROUTED_TO_ANOTHER_SEGMENT;
}
}
}
routed = backwards_bfs_route(
ni, lbo_wire, dst_wire, 1000000, false, [&](PipId pip, WireId src) { return true; }, &bound_pips);