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Added handling of the case when tri-state control net bypasses SIOLOGIC bel

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Signed-off-by: Maciej Kurc <mkurc@antmicro.com>
This commit is contained in:
Maciej Kurc 2021-09-15 14:56:05 +02:00
parent 7c82a04df5
commit 6948d41616
1 changed files with 81 additions and 2 deletions
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83
nexus/pack.cc
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@ -1197,10 +1197,10 @@ struct NexusPacker
NetInfo *dout = get_net_or_empty(ci, id_DOUT);
if (dout != nullptr && dout->users.size() == 1)
iob = dout->users.at(0).cell;
NetInfo *tout = get_net_or_empty(ci, id_DOUT);
NetInfo *tout = get_net_or_empty(ci, id_TOUT);
if (tout != nullptr && tout->users.size() == 1)
iob = tout->users.at(0).cell;
if (iob->type != id_SEIO18_CORE && iob->type != id_SEIO33_CORE && iob->type != id_DIFFIO18_CORE)
if (iob == nullptr || (iob->type != id_SEIO18_CORE && iob->type != id_SEIO33_CORE && iob->type != id_DIFFIO18_CORE))
log_error("Failed to find associated IOB for IOLOGIC %s\n", ctx->nameOf(ci));
io_to_iol[iob->name].push_back(ci);
}
@ -2075,6 +2075,84 @@ struct NexusPacker
}
}
// IOLOGIC requires some special handling around itself and IOB. This
// function does that.
void handle_iologic() {
for (auto &cell : ctx->cells) {
CellInfo* iol = cell.second.get();
if (iol->type != id_SIOLOGIC && iol->type != id_IOLOGIC) {
continue;
}
CellInfo *iob = nullptr;
NetInfo *di = get_net_or_empty(iol, id_DI);
if (di != nullptr && di->driver.cell != nullptr)
iob = di->driver.cell;
NetInfo *dout = get_net_or_empty(iol, id_DOUT);
if (dout != nullptr && dout->users.size() == 1)
iob = dout->users.at(0).cell;
NetInfo *tout = get_net_or_empty(iol, id_TOUT);
if (tout != nullptr && tout->users.size() == 1)
iob = tout->users.at(0).cell;
NPNR_ASSERT(iob != nullptr);
// SIOLOGIC handling
if (iol->type == id_SIOLOGIC) {
// Enable glitch filter for when it uses IDDR as observed
// done by the vendor toolchain.
NetInfo* dout = get_net_or_empty(iol, id_DOUT);
if (dout != nullptr && dout->users.size() == 1) {
if (iol->params.count(id_MODE) && iol->params.at(id_MODE).as_string() == "IDDRX1_ODDRX1") {
if (!iob->attrs.count(ctx->id("GLITCHFILTER"))) {
iob->attrs[ctx->id("GLITCHFILTER")] = std::string("ON");
}
}
}
// Detect case when SEIO33_CORE.T is not driven by
// SIOLOGIC.TOUT. In this case connect SIOLOGIC.TSDATA0 to the
// same ned as SEIO33_CORE.I.
NetInfo* iob_t = get_net_or_empty(iob, id_T);
if (iob_t != nullptr) {
NetInfo* iol_t = get_net_or_empty(iol, id_TOUT);
// SIOLOGIC.TOUT is not driving SEIO33_CORE.I
if ((iol_t == nullptr) ||
(iol_t != nullptr && iol_t->users.empty()) ||
(iol_t != nullptr && !iol_t->users.empty() && iol_t->name != iob_t->name)) {
// In this case if SIOLOGIC.TSDATA0 is not connected
// to the same net as SEIO33_CORE.I and is not
// floating then that configuration is illegal.
NetInfo* iol_ti = get_net_or_empty(iol, id_TSDATA0);
if (iol_ti != nullptr && (iol_ti->name != iob_t->name)
&& (iol_ti->name != gnd_net->name))
{
log_error("Cannot have %s.TSDATA0 and %s.T driven by different nets (%s vs. %s)\n",
ctx->nameOf(iol), ctx->nameOf(iob),
ctx->nameOf(iol_ti), ctx->nameOf(iob_t));
}
// Re-connect TSDATA (even if it has already been
// connected to gnd_net, see the condition above).
if (!iol->ports.count(id_TSDATA0)) {
iol->addInput(id_TSDATA0);
}
disconnect_port(ctx, iol, id_TSDATA0);
connect_port(ctx, iob_t, iol, id_TSDATA0);
if (ctx->debug) {
log_info("Reconnecting %s.TSDATA0 to %s\n", ctx->nameOf(iol), ctx->nameOf(iob_t));
}
}
}
}
}
}
explicit NexusPacker(Context *ctx) : ctx(ctx) {}
void operator()()
@ -2096,6 +2174,7 @@ struct NexusPacker
promote_globals();
place_globals();
generate_constraints();
handle_iologic();
}
};