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ecp5: Check for incorrect use of TRELLIS_IO 'B' pin

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-12-25 19:45:10 +00:00
parent e76479f379
commit 1661350d25
1 changed files with 9 additions and 0 deletions
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9
ecp5/pack.cc
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@ -299,7 +299,16 @@ class Ecp5Packer
// iobuf
log_info("%s feeds TRELLIS_IO %s, removing %s %s.\n", ci->name.c_str(ctx), trio->name.c_str(ctx),
ci->type.c_str(ctx), ci->name.c_str(ctx));
NetInfo *net = trio->ports.at(ctx->id("B")).net;
if (((ci->type == ctx->id("$nextpnr_ibuf") || ci->type == ctx->id("$nextpnr_iobuf")) &&
net->users.size() > 1) ||
(ci->type == ctx->id("$nextpnr_obuf") &&
(net->users.size() > 2 || net->driver.cell != nullptr)) ||
(ci->type == ctx->id("$nextpnr_iobuf") && ci->ports.at(ctx->id("I")).net != nullptr &&
ci->ports.at(ctx->id("I")).net->driver.cell != nullptr))
log_error("Pin B of %s '%s' connected to more than a single top level IO.\n",
trio->type.c_str(ctx), trio->name.c_str(ctx));
if (net != nullptr) {
ctx->nets.erase(net->name);
trio->ports.at(ctx->id("B")).net = nullptr;