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coolrunner2: Insert many more required feedthrough cells

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This commit is contained in:
R. Ou 2020-03-01 06:54:07 -08:00
parent 69c2d3848a
commit a6aeee4e1a
3 changed files with 217 additions and 104 deletions
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96
techlibs/coolrunner2/coolrunner2_sop.cc
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@ -108,14 +108,8 @@ struct Coolrunner2SopPass : public Pass {
}
// Check for special P-term usage
bool is_special_pterm = false;
bool special_pterm_can_invert = false;
if (special_pterms_no_inv.count(sop_output) || special_pterms_inv.count(sop_output))
{
is_special_pterm = true;
if (!special_pterms_no_inv[sop_output].size())
special_pterm_can_invert = true;
}
bool is_special_pterm =
special_pterms_no_inv.count(sop_output) || special_pterms_inv.count(sop_output);
// Construct AND cells
pool<SigBit> intermed_wires;
@ -159,53 +153,38 @@ struct Coolrunner2SopPass : public Pass {
// Special P-term handling
if (is_special_pterm)
{
if (!has_invert || special_pterm_can_invert)
// Can always connect the P-term directly if it's going
// into something invert-capable
for (auto x : special_pterms_inv[sop_output])
{
std::get<0>(x)->setPort(std::get<1>(x), *intermed_wires.begin());
// If this signal is indeed inverted, flip the cell polarity
if (has_invert)
{
auto cell = std::get<0>(x);
if (cell->type == "\\FDCP") cell->type = "\\FDCP_N";
else if (cell->type == "\\FDCP_N") cell->type = "\\FDCP";
else if (cell->type == "\\FTCP") cell->type = "\\FTCP_N";
else if (cell->type == "\\FTCP_N") cell->type = "\\FTCP";
else if (cell->type == "\\FDCPE") cell->type = "\\FDCPE_N";
else if (cell->type == "\\FDCPE_N") cell->type = "\\FDCPE";
else if (cell->type == "\\LDCP") cell->type = "\\LDCP_N";
else if (cell->type == "\\LDCP_N") cell->type = "\\LDCP";
else log_assert(!"Internal error! Bad cell type!");
}
}
// If it's going into something that's not invert-capable,
// connect it directly only if this signal isn't inverted
if (!has_invert)
{
// Can connect the P-term directly to the special term sinks
for (auto x : special_pterms_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), *intermed_wires.begin());
for (auto x : special_pterms_no_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), *intermed_wires.begin());
}
if (has_invert)
{
if (special_pterm_can_invert)
{
log_assert(special_pterms_no_inv[sop_output].size() == 0);
for (auto x : special_pterms_inv[sop_output])
{
auto cell = std::get<0>(x);
// Need to invert the polarity of the cell
if (cell->type == "\\FDCP") cell->type = "\\FDCP_N";
else if (cell->type == "\\FDCP_N") cell->type = "\\FDCP";
else if (cell->type == "\\FTCP") cell->type = "\\FTCP_N";
else if (cell->type == "\\FTCP_N") cell->type = "\\FTCP";
else if (cell->type == "\\FDCPE") cell->type = "\\FDCPE_N";
else if (cell->type == "\\FDCPE_N") cell->type = "\\FDCPE";
else if (cell->type == "\\LDCP") cell->type = "\\LDCP_N";
else if (cell->type == "\\LDCP_N") cell->type = "\\LDCP";
else log_assert(!"Internal error! Bad cell type!");
}
}
else
{
// Need to construct a feed-through term
auto feedthrough_out = module->addWire(NEW_ID);
auto feedthrough_cell = module->addCell(NEW_ID, "\\ANDTERM");
feedthrough_cell->setParam("\\TRUE_INP", 1);
feedthrough_cell->setParam("\\COMP_INP", 0);
feedthrough_cell->setPort("\\OUT", feedthrough_out);
feedthrough_cell->setPort("\\IN", sop_output);
feedthrough_cell->setPort("\\IN_B", SigSpec());
for (auto x : special_pterms_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), feedthrough_out);
for (auto x : special_pterms_no_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), feedthrough_out);
}
}
// Otherwise, a feedthrough P-term has to be created. Leave that to happen
// in the coolrunner2_fixup pass.
}
}
else
@ -224,23 +203,6 @@ struct Coolrunner2SopPass : public Pass {
xor_cell->setParam("\\INVERT_OUT", has_invert);
xor_cell->setPort("\\IN_ORTERM", or_to_xor_wire);
xor_cell->setPort("\\OUT", sop_output);
if (is_special_pterm)
{
// Need to construct a feed-through term
auto feedthrough_out = module->addWire(NEW_ID);
auto feedthrough_cell = module->addCell(NEW_ID, "\\ANDTERM");
feedthrough_cell->setParam("\\TRUE_INP", 1);
feedthrough_cell->setParam("\\COMP_INP", 0);
feedthrough_cell->setPort("\\OUT", feedthrough_out);
feedthrough_cell->setPort("\\IN", sop_output);
feedthrough_cell->setPort("\\IN_B", SigSpec());
for (auto x : special_pterms_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), feedthrough_out);
for (auto x : special_pterms_no_inv[sop_output])
std::get<0>(x)->setPort(std::get<1>(x), feedthrough_out);
}
}
// Finally, remove the $sop cell