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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2019 gatecat <gatecat@ds0.me>
*
* 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 "cells.h"
#include "design_utils.h"
#include "log.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
std::unique_ptr<CellInfo> create_generic_cell(Context *ctx, IdString type, std::string name)
{
static int auto_idx = 0;
IdString name_id =
name.empty() ? ctx->id("$nextpnr_" + type.str(ctx) + "_" + std::to_string(auto_idx++)) : ctx->id(name);
auto new_cell = std::make_unique<CellInfo>(ctx, name_id, type);
if (type == ctx->id("GENERIC_SLICE")) {
new_cell->params[ctx->id("K")] = ctx->args.K;
new_cell->params[ctx->id("INIT")] = 0;
new_cell->params[ctx->id("FF_USED")] = 0;
for (int i = 0; i < ctx->args.K; i++)
new_cell->addInput(ctx->id("I[" + std::to_string(i) + "]"));
new_cell->addInput(ctx->id("CLK"));
new_cell->addOutput(ctx->id("F"));
new_cell->addOutput(ctx->id("Q"));
} else if (type == ctx->id("GENERIC_IOB")) {
new_cell->params[ctx->id("INPUT_USED")] = 0;
new_cell->params[ctx->id("OUTPUT_USED")] = 0;
new_cell->params[ctx->id("ENABLE_USED")] = 0;
new_cell->addInout(ctx->id("PAD"));
new_cell->addInput(ctx->id("I"));
new_cell->addInput(ctx->id("EN"));
new_cell->addOutput(ctx->id("O"));
} else {
log_error("unable to create generic cell of type %s", type.c_str(ctx));
}
return new_cell;
}
void lut_to_lc(const Context *ctx, CellInfo *lut, CellInfo *lc, bool no_dff)
{
lc->params[ctx->id("INIT")] = lut->params[ctx->id("INIT")];
int lut_k = int_or_default(lut->params, ctx->id("K"), 4);
NPNR_ASSERT(lut_k <= ctx->args.K);
for (int i = 0; i < lut_k; i++) {
IdString port = ctx->id("I[" + std::to_string(i) + "]");
lut->movePortTo(port, lc, port);
}
if (no_dff) {
lc->params[ctx->id("FF_USED")] = 0;
lut->movePortTo(ctx->id("Q"), lc, ctx->id("F"));
}
}
void dff_to_lc(const Context *ctx, CellInfo *dff, CellInfo *lc, bool pass_thru_lut)
{
lc->params[ctx->id("FF_USED")] = 1;
dff->movePortTo(ctx->id("CLK"), lc, ctx->id("CLK"));
if (pass_thru_lut) {
// Fill LUT with alternating 10
const int init_size = 1 << lc->params[ctx->id("K")].as_int64();
std::string init;
init.reserve(init_size);
for (int i = 0; i < init_size; i += 2)
init.append("10");
lc->params[ctx->id("INIT")] = Property::from_string(init);
dff->movePortTo(ctx->id("D"), lc, ctx->id("I[0]"));
}
dff->movePortTo(ctx->id("Q"), lc, ctx->id("Q"));
}
void nxio_to_iob(Context *ctx, CellInfo *nxio, CellInfo *iob, pool<IdString> &todelete_cells)
{
if (nxio->type == ctx->id("$nextpnr_ibuf")) {
iob->params[ctx->id("INPUT_USED")] = 1;
nxio->movePortTo(ctx->id("O"), iob, ctx->id("O"));
} else if (nxio->type == ctx->id("$nextpnr_obuf")) {
iob->params[ctx->id("OUTPUT_USED")] = 1;
nxio->movePortTo(ctx->id("I"), iob, ctx->id("I"));
} else if (nxio->type == ctx->id("$nextpnr_iobuf")) {
// N.B. tristate will be dealt with below
iob->params[ctx->id("INPUT_USED")] = 1;
iob->params[ctx->id("OUTPUT_USED")] = 1;
nxio->movePortTo(ctx->id("I"), iob, ctx->id("I"));
nxio->movePortTo(ctx->id("O"), iob, ctx->id("O"));
} else {
NPNR_ASSERT(false);
}
NetInfo *donet = iob->ports.at(ctx->id("I")).net;
CellInfo *tbuf = net_driven_by(
ctx, donet, [](const Context *ctx, const CellInfo *cell) { return cell->type == ctx->id("$_TBUF_"); },
ctx->id("Y"));
if (tbuf) {
iob->params[ctx->id("ENABLE_USED")] = 1;
tbuf->movePortTo(ctx->id("A"), iob, ctx->id("I"));
tbuf->movePortTo(ctx->id("E"), iob, ctx->id("EN"));
if (donet->users.entries() > 1) {
for (auto user : donet->users)
log_info(" remaining tristate user: %s.%s\n", user.cell->name.c_str(ctx), user.port.c_str(ctx));
log_error("unsupported tristate IO pattern for IO buffer '%s', "
"instantiate GENERIC_IOB manually to ensure correct behaviour\n",
nxio->name.c_str(ctx));
}
ctx->nets.erase(donet->name);
todelete_cells.insert(tbuf->name);
}
}
NEXTPNR_NAMESPACE_END
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