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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2017 Robert Ou <rqou@robertou.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct Coolrunner2SopPass : public Pass {
Coolrunner2SopPass() : Pass("coolrunner2_sop", "break $sop cells into ANDTERM/ORTERM cells") { }
virtual void help()
{
log("\n");
log(" coolrunner2_sop [options] [selection]\n");
log("\n");
log("Break $sop cells into ANDTERM/ORTERM cells.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
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_")
{
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);
for (auto cell : module->selected_cells())
{
if (cell->type == "$sop")
{
// Read the inputs/outputs/parameters of the $sop cell
auto sop_inputs = sigmap(cell->getPort("\\A"));
auto sop_output = sigmap(cell->getPort("\\Y"))[0];
auto sop_depth = cell->getParam("\\DEPTH").as_int();
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))
{
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++) {
// Wire for the output
auto and_out = module->addWire(NEW_ID);
intermed_wires.insert(and_out);
// Signals for the inputs
pool<SigBit> and_in_true;
pool<SigBit> and_in_comp;
for (int j = 0; j < sop_width; j++)
{
if (sop_table[2 * (i * sop_width + j) + 0])
{
and_in_comp.insert(sop_inputs[j]);
}
if (sop_table[2 * (i * sop_width + j) + 1])
{
and_in_true.insert(sop_inputs[j]);
}
}
// Construct the cell
auto and_cell = module->addCell(NEW_ID, "\\ANDTERM");
and_cell->setParam("\\TRUE_INP", GetSize(and_in_true));
and_cell->setParam("\\COMP_INP", GetSize(and_in_comp));
and_cell->setPort("\\OUT", and_out);
and_cell->setPort("\\IN", and_in_true);
and_cell->setPort("\\IN_B", and_in_comp);
}
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", has_invert);
xor_cell->setPort("\\IN_PTC", *intermed_wires.begin());
xor_cell->setPort("\\OUT", sop_output);
}
else
{
// Wire from OR to XOR
auto or_to_xor_wire = module->addWire(NEW_ID);
// Construct the OR cell
auto or_cell = module->addCell(NEW_ID, "\\ORTERM");
or_cell->setParam("\\WIDTH", sop_depth);
or_cell->setPort("\\IN", intermed_wires);
or_cell->setPort("\\OUT", or_to_xor_wire);
// Construct the XOR cell
auto xor_cell = module->addCell(NEW_ID, "\\MACROCELL_XOR");
xor_cell->setParam("\\INVERT_PTC", 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
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;
PRIVATE_NAMESPACE_END
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