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nexus: Add FASM export for comb logic and FFs

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-01-10 21:35:21 +00:00
parent 2c49f812d9
commit 689922bc21
2 changed files with 65 additions and 0 deletions
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5
nexus/constids.inc
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@ -96,3 +96,8 @@ X(LSRMODE)
X(MODE)
X(INJECT)
X(PLC)
X(CIB)
X(CIB_T)
X(CIB_LR)

60
nexus/fasm.cc
View File

@ -80,6 +80,17 @@ struct NexusFasmWriter
write_vector(name, bits, invert);
}
void write_enum(const CellInfo *cell, const std::string &name, const std::string &defval = "")
{
auto fnd = cell->params.find(ctx->id(name));
if (fnd == cell->params.end()) {
if (!defval.empty())
write_bit(stringf("%s.%s", name.c_str(), defval.c_str()));
} else {
write_bit(stringf("%s.%s", name.c_str(), fnd->second.c_str()));
}
}
NexusFasmWriter(const Context *ctx, std::ostream &out) : ctx(ctx), out(out) {}
std::string tile_name(int loc, const PhysicalTileInfoPOD &tile)
{
@ -108,6 +119,7 @@ struct NexusFasmWriter
}
return escaped;
}
void push_tile(int loc, IdString tile_type) { push(tile_name(loc, tile_by_type_and_loc(loc, tile_type))); }
void write_pip(PipId pip)
{
auto &pd = ctx->pip_data(pip);
@ -128,12 +140,60 @@ struct NexusFasmWriter
write_pip(p);
blank();
}
void write_comb(const CellInfo *cell)
{
BelId bel = cell->bel;
int z = ctx->bel_data(bel).z;
int k = z & 0x1;
char slice = 'A' + (z >> 8);
push_tile(bel.tile, id_PLC);
push(stringf("SLICE%c", slice));
if (cell->params.count(id_INIT))
write_int_vector(stringf("K%d.INIT", k), int_or_default(cell->params, id_INIT, 0), 16);
if (cell->lutInfo.is_carry) {
write_bit("MODE.CCU2");
write_enum(cell, "INJECT", "NO");
}
pop(2);
}
void write_ff(const CellInfo *cell)
{
BelId bel = cell->bel;
int z = ctx->bel_data(bel).z;
int k = z & 0x1;
char slice = 'A' + (z >> 8);
push_tile(bel.tile, id_PLC);
push(stringf("SLICE%c", slice));
push(stringf("FF%d", k));
write_bit("USED.YES");
write_enum(cell, "REGSET", "RESET");
write_enum(cell, "LSRMODE", "LSR");
write_enum(cell, "SEL", "DF");
pop();
write_enum(cell, "REGDDR");
write_enum(cell, "SRMODE");
write_enum(cell, "CLKMUX");
write_enum(cell, "CEMUX");
write_enum(cell, "LSRMUX");
write_enum(cell, "GSR");
pop(2);
}
void operator()()
{
// Write routing
for (auto n : sorted(ctx->nets)) {
write_net(n.second);
}
// Write cell config
for (auto c : sorted(ctx->cells)) {
const CellInfo *ci = c.second;
write_comment(stringf("# Cell %s", ctx->nameOf(ci)));
if (ci->type == id_OXIDE_COMB)
write_comb(ci);
else if (ci->type == id_OXIDE_FF)
write_ff(ci);
blank();
}
}
};
} // namespace