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Add "memory_nordff" pass 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2018-03-06 23:31:51 +01:00
parent dcc4a18d5a
commit 73c01dca65
2 changed files with 112 additions and 0 deletions
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1
passes/memory/Makefile.inc
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@ -7,4 +7,5 @@ OBJS += passes/memory/memory_unpack.o
OBJS += passes/memory/memory_bram.o
OBJS += passes/memory/memory_map.o
OBJS += passes/memory/memory_memx.o
OBJS += passes/memory/memory_nordff.o

111
passes/memory/memory_nordff.cc Normal file
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@ -0,0 +1,111 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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 MemoryNordffPass : public Pass {
MemoryNordffPass() : Pass("memory_nordff", "extract read port FFs from memories") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" memory_nordff [options] [selection]\n");
log("\n");
log("This pass extracts FFs from memory read ports. This results in a netlist\n");
log("similar to what one would get from calling memory_dff with -nordff.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
log_header(design, "Executing MEMORY_NORDFF pass (extracting $dff cells from $mem).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
// if (args[argidx] == "-nordff" || args[argidx] == "-wr_only") {
// flag_wr_only = true;
// continue;
// }
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
for (auto cell : vector<Cell*>(module->selected_cells()))
{
if (cell->type != "$mem")
continue;
int rd_ports = cell->getParam("\\RD_PORTS").as_int();
int abits = cell->getParam("\\ABITS").as_int();
int width = cell->getParam("\\WIDTH").as_int();
SigSpec rd_addr = cell->getPort("\\RD_ADDR");
SigSpec rd_data = cell->getPort("\\RD_DATA");
Const rd_clk_enable = cell->getParam("\\RD_CLK_ENABLE");
for (int i = 0; i < rd_ports; i++)
{
bool clk_enable = rd_clk_enable[i] == State::S1;
if (!clk_enable)
continue;
bool clk_polarity = cell->getParam("\\RD_CLK_POLARITY")[i] == State::S1;
bool transparent = cell->getParam("\\RD_TRANSPARENT")[i] == State::S1;
SigSpec clk = cell->getPort("\\RD_CLK")[i] ;
SigSpec en = cell->getPort("\\RD_EN")[i];
Cell *c;
if (transparent)
{
SigSpec sig_q = module->addWire(NEW_ID, abits);
SigSpec sig_d = rd_addr.extract(abits * i, abits);
rd_addr.replace(abits * i, sig_q);
if (en != State::S1)
sig_d = module->Mux(NEW_ID, sig_q, sig_d, en);
c = module->addDff(NEW_ID, clk, sig_d, sig_q, clk_polarity);
}
else
{
SigSpec sig_d = module->addWire(NEW_ID, width);
SigSpec sig_q = rd_data.extract(width * i, width);
rd_data.replace(width *i, sig_d);
if (en != State::S1)
sig_d = module->Mux(NEW_ID, sig_q, sig_d, en);
c = module->addDff(NEW_ID, clk, sig_d, sig_q, clk_polarity);
}
log("Extracted %s FF from read port %d of %s.%s: %s\n", transparent ? "addr" : "data",
i, log_id(module), log_id(cell), log_id(c));
rd_clk_enable[i] = State::S0;
}
cell->setPort("\\RD_ADDR", rd_addr);
cell->setPort("\\RD_DATA", rd_data);
cell->setParam("\\RD_CLK_ENABLE", rd_clk_enable);
}
}
} MemoryNordffPass;
PRIVATE_NAMESPACE_END