riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

coolrunner2: Correctly handle $_NOT_ after $sop

This commit is contained in:
Robert Ou 2017-06-25 02:42:36 -07:00
parent 908ce3fdce
commit 5798105d47
1 changed files with 41 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
techlibs/coolrunner2/coolrunner2_sop.cpp
View File

@ -38,6 +38,24 @@ 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 $_NOT_ cells
dict<SigBit, tuple<SigBit, Cell*>> not_cells;
for (auto module : design->selected_modules())
{
SigMap sigmap(module);
for (auto cell : module->selected_cells())
{
if (cell->type == "$_NOT_")
{
log("found not cell %s\n", log_id(cell));
auto not_input = cell->getPort("\\A")[0];
auto not_output = cell->getPort("\\Y")[0];
not_cells[not_input] = {not_output, cell};
}
}
}
pool<tuple<Module*, Cell*>> cells_to_remove;
for (auto module : design->selected_modules())
{
SigMap sigmap(module);
@ -52,6 +70,20 @@ struct Coolrunner2SopPass : public Pass {
auto sop_width = cell->getParam("\\WIDTH").as_int();
auto sop_table = cell->getParam("\\TABLE");
// Check for a $_NOT_ at the output
bool has_invert = false;
if (not_cells.count(sop_output))
{
log("sop output is inverted %s\n", log_id(cell));
auto not_cell = not_cells.at(sop_output);
has_invert = true;
sop_output = std::get<0>(not_cell);
// remove the $_NOT_ cell because it gets folded into the xor
cells_to_remove.insert({module, std::get<1>(not_cell)});
}
// Construct AND cells
pool<SigBit> intermed_wires;
for (int i = 0; i < sop_depth; i++) {
@ -83,14 +115,12 @@ struct Coolrunner2SopPass : public Pass {
and_cell->setPort("\\IN_B", and_in_comp);
}
// TODO: Find the $_NOT_ on the output
if (sop_depth == 1)
{
// If there is only one term, don't construct an OR cell. Directly construct the XOR gate
auto xor_cell = module->addCell(NEW_ID, "\\MACROCELL_XOR");
xor_cell->setParam("\\INVERT_PTC", 0);
xor_cell->setParam("\\INVERT_OUT", 0);
xor_cell->setParam("\\INVERT_OUT", has_invert);
xor_cell->setPort("\\IN_PTC", *intermed_wires.begin());
xor_cell->setPort("\\OUT", sop_output);
}
@ -108,16 +138,22 @@ struct Coolrunner2SopPass : public Pass {
// Construct the XOR cell
auto xor_cell = module->addCell(NEW_ID, "\\MACROCELL_XOR");
xor_cell->setParam("\\INVERT_PTC", 0);
xor_cell->setParam("\\INVERT_OUT", 0);
xor_cell->setParam("\\INVERT_OUT", has_invert);
xor_cell->setPort("\\IN_ORTERM", or_to_xor_wire);
xor_cell->setPort("\\OUT", sop_output);
}
// Finally, remove the $sop cell
module->remove(cell);
cells_to_remove.insert({module, 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));
}
}
} Coolrunner2SopPass;