mirror of https://github.com/YosysHQ/yosys.git
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/*
|
|
* yosys -- Yosys Open SYnthesis Suite
|
|
*
|
|
* Copyright (C) 2020 Marcelina Kościelnicka <mwk@0x04.net>
|
|
*
|
|
* 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"
|
|
#include "kernel/ff.h"
|
|
|
|
USING_YOSYS_NAMESPACE
|
|
PRIVATE_NAMESPACE_BEGIN
|
|
|
|
struct DffunmapPass : public Pass {
|
|
DffunmapPass() : Pass("dffunmap", "unmap clock enable and synchronous reset from FFs") { }
|
|
void help() override
|
|
{
|
|
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
|
|
log("\n");
|
|
log(" dffunmap [options] [selection]\n");
|
|
log("\n");
|
|
log("This pass transforms FF types with clock enable and/or synchronous reset into\n");
|
|
log("their base type (with neither clock enable nor sync reset) by emulating the clock\n");
|
|
log("enable and synchronous reset with multiplexers on the cell input.\n");
|
|
log("\n");
|
|
log(" -ce-only\n");
|
|
log(" unmap only clock enables, leave synchronous resets alone.\n");
|
|
log("\n");
|
|
log(" -srst-only\n");
|
|
log(" unmap only synchronous resets, leave clock enables alone.\n");
|
|
log("\n");
|
|
}
|
|
void execute(std::vector<std::string> args, RTLIL::Design *design) override
|
|
{
|
|
log_header(design, "Executing DFFUNMAP pass (unmap clock enable and synchronous reset from FFs).\n");
|
|
|
|
bool ce_only = false;
|
|
bool srst_only = false;
|
|
|
|
size_t argidx;
|
|
for (argidx = 1; argidx < args.size(); argidx++) {
|
|
if (args[argidx] == "-ce-only") {
|
|
ce_only = true;
|
|
continue;
|
|
}
|
|
if (args[argidx] == "-srst-only") {
|
|
srst_only = true;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
extra_args(args, argidx, design);
|
|
|
|
if (ce_only && srst_only)
|
|
log_cmd_error("Options -ce-only and -srst-only are mutually exclusive!\n");
|
|
|
|
for (auto mod : design->selected_modules())
|
|
{
|
|
SigMap sigmap(mod);
|
|
FfInitVals initvals(&sigmap, mod);
|
|
|
|
for (auto cell : mod->selected_cells())
|
|
{
|
|
if (!RTLIL::builtin_ff_cell_types().count(cell->type))
|
|
continue;
|
|
|
|
FfData ff(&initvals, cell);
|
|
IdString name = cell->name;
|
|
|
|
if (!ff.has_clk)
|
|
continue;
|
|
|
|
if (ce_only) {
|
|
if (!ff.has_ce)
|
|
continue;
|
|
ff.unmap_ce(mod);
|
|
} else if (srst_only) {
|
|
if (!ff.has_srst)
|
|
continue;
|
|
ff.unmap_srst(mod);
|
|
} else {
|
|
if (!ff.has_ce && !ff.has_srst)
|
|
continue;
|
|
ff.unmap_ce_srst(mod);
|
|
}
|
|
|
|
mod->remove(cell);
|
|
ff.emit(mod, name);
|
|
}
|
|
}
|
|
}
|
|
} DffunmapPass;
|
|
|
|
PRIVATE_NAMESPACE_END
|