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ecp5: Fixing EBR constant tie-offs

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-10-05 16:47:03 +01:00
parent 85a95ec250
commit cd688a2784
2 changed files with 51 additions and 1 deletions
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3
ecp5/bitstream.cc
View File

@ -88,6 +88,7 @@ static void tie_cib_signal(Context *ctx, ChipConfig &cc, WireId wire, bool value
NPNR_ASSERT(uphill.begin() != uphill.end()); // At least one uphill pip
auto iter = uphill.begin();
cibsig = ctx->getPipSrcWire(*iter);
basename = ctx->getWireBasename(cibsig).str(ctx);
++iter;
NPNR_ASSERT(!(iter != uphill.end())); // Exactly one uphill pip
}
@ -454,7 +455,7 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
// Tie signals as appropriate
for (auto port : ci->ports) {
if (port.second.net == nullptr) {
if (port.second.net == nullptr && port.second.type == PORT_IN) {
if (port.first == id_CLKA || port.first == id_CLKB || port.first == id_WEA ||
port.first == id_WEB || port.first == id_CEA || port.first == id_CEB || port.first == id_OCEA ||
port.first == id_OCEB || port.first == id_RSTA || port.first == id_RSTB)

49
ecp5/pack.cc
View File

@ -909,10 +909,59 @@ class Ecp5Packer
}
}
void autocreate_empty_port(CellInfo *cell, IdString port)
{
if (!cell->ports.count(port)) {
cell->ports[port].name = port;
cell->ports[port].net = nullptr;
cell->ports[port].type = PORT_IN;
}
}
// Pack EBR
void pack_ebr()
{
for (auto cell : sorted(ctx->cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_DP16KD) {
// Add ports, even if disconnected, to ensure correct tie-offs
for (int i = 0; i < 14; i++) {
autocreate_empty_port(ci, ctx->id("ADA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("ADB" + std::to_string(i)));
}
for (int i = 0; i < 18; i++) {
autocreate_empty_port(ci, ctx->id("DIA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("DIB" + std::to_string(i)));
}
for (int i = 0; i < 3; i++) {
autocreate_empty_port(ci, ctx->id("CSA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("CSB" + std::to_string(i)));
}
for (int i = 0; i < 3; i++) {
autocreate_empty_port(ci, ctx->id("CSA" + std::to_string(i)));
autocreate_empty_port(ci, ctx->id("CSB" + std::to_string(i)));
}
autocreate_empty_port(ci, id_CLKA);
autocreate_empty_port(ci, id_CEA);
autocreate_empty_port(ci, id_OCEA);
autocreate_empty_port(ci, id_WEA);
autocreate_empty_port(ci, id_RSTA);
autocreate_empty_port(ci, id_CLKB);
autocreate_empty_port(ci, id_CEB);
autocreate_empty_port(ci, id_OCEB);
autocreate_empty_port(ci, id_WEB);
autocreate_empty_port(ci, id_RSTB);
}
}
}
public:
void pack()
{
pack_io();
pack_ebr();
pack_constants();
pack_dram();
pack_carries();