diff options
Diffstat (limited to 'techlibs/coolrunner2/coolrunner2_sop.cc')
-rw-r--r-- | techlibs/coolrunner2/coolrunner2_sop.cc | 138 |
1 files changed, 122 insertions, 16 deletions
diff --git a/techlibs/coolrunner2/coolrunner2_sop.cc b/techlibs/coolrunner2/coolrunner2_sop.cc index eb8754de7..b57214ccb 100644 --- a/techlibs/coolrunner2/coolrunner2_sop.cc +++ b/techlibs/coolrunner2/coolrunner2_sop.cc @@ -38,26 +38,53 @@ struct Coolrunner2SopPass : public Pass { log_header(design, "Executing COOLRUNNER2_SOP pass (break $sop cells into ANDTERM/ORTERM cells).\n"); extra_args(args, 1, design); - // Find all the $_NOT_ cells - dict<SigBit, tuple<SigBit, Cell*>> not_cells; for (auto module : design->selected_modules()) { + pool<Cell*> cells_to_remove; SigMap sigmap(module); + + // Find all the $_NOT_ cells + dict<SigBit, tuple<SigBit, Cell*>> not_cells; for (auto cell : module->selected_cells()) { if (cell->type == "$_NOT_") { - auto not_input = cell->getPort("\\A")[0]; - auto not_output = cell->getPort("\\Y")[0]; + auto not_input = sigmap(cell->getPort("\\A")[0]); + auto not_output = sigmap(cell->getPort("\\Y")[0]); not_cells[not_input] = tuple<SigBit, Cell*>(not_output, cell); } } - } - pool<tuple<Module*, Cell*>> cells_to_remove; - for (auto module : design->selected_modules()) - { - SigMap sigmap(module); + // Find wires that need to become special product terms + dict<SigBit, pool<tuple<Cell*, std::string>>> special_pterms_no_inv; + dict<SigBit, pool<tuple<Cell*, std::string>>> special_pterms_inv; + for (auto cell : module->selected_cells()) + { + if (cell->type == "\\FDCP" || cell->type == "\\FDCP_N" || cell->type == "\\FDDCP" || + cell->type == "\\FTCP" || cell->type == "\\FTCP_N" || cell->type == "\\FTDCP" || + cell->type == "\\FDCPE" || cell->type == "\\FDCPE_N" || cell->type == "\\FDDCPE" || + cell->type == "\\LDCP" || cell->type == "\\LDCP_N") + { + if (cell->hasPort("\\PRE")) + special_pterms_no_inv[sigmap(cell->getPort("\\PRE")[0])].insert( + tuple<Cell*, const char *>(cell, "\\PRE")); + if (cell->hasPort("\\CLR")) + special_pterms_no_inv[sigmap(cell->getPort("\\CLR")[0])].insert( + tuple<Cell*, const char *>(cell, "\\CLR")); + if (cell->hasPort("\\CE")) + special_pterms_no_inv[sigmap(cell->getPort("\\CE")[0])].insert( + tuple<Cell*, const char *>(cell, "\\CE")); + + if (cell->hasPort("\\C")) + special_pterms_inv[sigmap(cell->getPort("\\C")[0])].insert( + tuple<Cell*, const char *>(cell, "\\C")); + if (cell->hasPort("\\G")) + special_pterms_inv[sigmap(cell->getPort("\\G")[0])].insert( + tuple<Cell*, const char *>(cell, "\\G")); + } + } + + // Process $sop cells for (auto cell : module->selected_cells()) { if (cell->type == "$sop") @@ -79,7 +106,17 @@ struct Coolrunner2SopPass : public Pass { sop_output = std::get<0>(not_cell); // remove the $_NOT_ cell because it gets folded into the xor - cells_to_remove.insert(tuple<Module*, Cell*>(module, std::get<1>(not_cell))); + cells_to_remove.insert(std::get<1>(not_cell)); + } + + // 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; } // Construct AND cells @@ -120,6 +157,58 @@ struct Coolrunner2SopPass : public Pass { xor_cell->setParam("\\INVERT_OUT", has_invert); xor_cell->setPort("\\IN_PTC", *intermed_wires.begin()); xor_cell->setPort("\\OUT", sop_output); + + // Special P-term handling + if (is_special_pterm) + { + if (!has_invert || special_pterm_can_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); + } + } + } } else { @@ -137,18 +226,35 @@ 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 - cells_to_remove.insert(tuple<Module*, Cell*>(module, cell)); + cells_to_remove.insert(cell); } } - } - // Actually do the removal now that we aren't iterating - for (auto mod_and_cell : cells_to_remove) - { - std::get<0>(mod_and_cell)->remove(std::get<1>(mod_and_cell)); + // Actually do the removal now that we aren't iterating + for (auto cell : cells_to_remove) + { + module->remove(cell); + } } } } Coolrunner2SopPass; |