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ecp5: Fix placement of ECLKBRIDGECS

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-11-01 16:02:23 +00:00
parent 5cf0ed5ede
commit 58b7cb920f
1 changed files with 41 additions and 11 deletions
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46
ecp5/pack.cc
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@ -2353,6 +2353,7 @@ class Ecp5Packer
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_ECLKBRIDGECS) {
Loc loc;
NetInfo *i0 = get_net_or_empty(ci, id_CLK0), *i1 = get_net_or_empty(ci, id_CLK1),
*o = get_net_or_empty(ci, id_ECSOUT);
for (NetInfo *input : {i0, i1}) {
@ -2366,9 +2367,44 @@ class Ecp5Packer
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
Loc loc = ctx->getBelLocation(bel);
loc = ctx->getBelLocation(bel);
if (loc.x == user_loc.x) {
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
goto eclkbridge_done;
}
}
}
if (input->driver.cell != nullptr) {
CellInfo *drv = input->driver.cell;
if (!drv->attrs.count(ctx->id("BEL")))
continue;
Loc drv_loc = ctx->getBelLocation(
ctx->getBelByName(ctx->id(drv->attrs.at(ctx->id("BEL")).as_string())));
BelId closest;
int closest_x = -1; // aim for same side of chip
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
loc = ctx->getBelLocation(bel);
if (closest_x == -1 || std::abs(loc.x - drv_loc.x) < std::abs(closest_x - drv_loc.x)) {
closest_x = loc.x;
closest = bel;
}
}
NPNR_ASSERT(closest != BelId());
loc = ctx->getBelLocation(closest);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(closest).str(ctx);
goto eclkbridge_done;
}
}
// If all else fails, place randomly
for (auto bel : ctx->getBels()) {
if (ctx->getBelType(bel) != id_ECLKBRIDGECS)
continue;
loc = ctx->getBelLocation(bel);
ci->attrs[ctx->id("BEL")] = ctx->getBelName(bel).str(ctx);
}
eclkbridge_done:
if (o != nullptr)
for (auto user2 : o->users) {
// Set side hint to ensure edge clock choice is routeable
@ -2378,12 +2414,6 @@ class Ecp5Packer
bridge_side_hint[synco] = (loc.x > 1) ? 0 : 1;
}
}
goto eclkbridge_done;
}
}
}
}
eclkbridge_done:
continue;
}
}
@ -2659,12 +2689,12 @@ class Ecp5Packer
prepack_checks();
pack_io();
pack_dqsbuf();
preplace_plls();
pack_iologic();
pack_ebr();
pack_dsps();
pack_dcus();
pack_misc();
preplace_plls();
pack_constants();
pack_dram();
pack_carries();