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nexus: Add support for initialised LRAM

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-12-07 11:57:10 +00:00
parent 270efdca85
commit f923d32620
4 changed files with 50 additions and 12 deletions
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1
nexus/arch.h
View File

@ -849,6 +849,7 @@ enum CellPinStyle
PINSTYLE_ADLSB = 0x4017, // special case of the EBR address MSBs
PINSTYLE_INV_PD = 0x0017, // invertible, pull down by default
PINSTYLE_INV_PD_CIB = 0x4017, // invertible, pull down by default
PINSTYLE_INV_PU = 0x4027, // invertible, pull up by default
PINSTYLE_IOL_CE = 0x2027, // CE type signal, with explicit 'const-1' config bit

24
nexus/fasm.cc
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@ -603,7 +603,7 @@ struct NexusFasmWriter
push_bel(bel);
write_enum(cell, "ASYNC_RST_RELEASE", "SYNC");
write_enum(cell, "EBR_SP_EN", "DISABLE");
write_enum(cell, "ECC_BYTE_SEL", "ECC_EN");
write_enum(cell, "ECC_BYTE_SEL", "BYTE_EN");
write_enum(cell, "GSR", "DISABLED");
write_enum(cell, "OUT_REGMODE_A", "NO_REG");
write_enum(cell, "OUT_REGMODE_B", "NO_REG");
@ -611,6 +611,28 @@ struct NexusFasmWriter
write_enum(cell, "UNALIGNED_READ", "DISABLE");
write_cell_muxes(cell);
pop();
blank();
Loc l = ctx->getBelLocation(bel);
push(stringf("IP_LRAM_CORE_R%dC%d", l.y, l.x));
for (int i = 0; i < 128; i++) {
IdString param = ctx->id(stringf("INITVAL_%02X", i));
if (!cell->params.count(param))
continue;
auto &prop = cell->params.at(param);
std::string value;
if (prop.is_string) {
NPNR_ASSERT(prop.str.substr(0, 2) == "0x");
// Lattice-style hex string
value = prop.str.substr(2);
value = stringf("5120'h%s", value.c_str());
} else {
// True Verilog bitvector
value = stringf("5120'b%s", prop.str.c_str());
}
write_bit(stringf("INITVAL_%02X[5119:0] = %s", i, value.c_str()));
}
pop();
}
// Write out FASM for unused bels where needed
void write_unused()

7
nexus/pack.cc
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@ -1132,14 +1132,17 @@ struct NexusPacker
CellInfo *ci = cell.second;
if (ci->type != id_LRAM_CORE)
continue;
if (str_or_default(ci->params, ctx->id("ECC_BYTE_SEL"), "BYTE_EN") == "BYTE_EN")
continue;
for (int i = 0; i < 0x80; i++) {
// FIXME: support on the prjoxide side
// FIXME: document ECC and remove this DRC
std::string name = stringf("INITVAL_%02X", i);
if (!ci->params.count(ctx->id(name)))
continue;
if (ci->params.at(ctx->id(name)).str.find_last_not_of("0x") == std::string::npos)
continue;
log_error("LRAM initialisation is currently unsupported (prjoxide limitation).\n");
log_error("LRAM initialisation is currently unsupported in ECC mode (to disable ECC, set ECC_BYTE_SEL "
"to BYTE_EN).\n");
}
}
}

24
nexus/pins.cc
View File

@ -170,12 +170,24 @@ static const std::unordered_map<IdString, Arch::CellPinsData> base_cell_pin_data
}},
{id_LRAM_CORE,
{
{id_CLK, PINSTYLE_CLK}, {id_CEA, PINSTYLE_CE}, {id_CEB, PINSTYLE_CE},
{id_OCEA, PINSTYLE_PU}, {id_OCEB, PINSTYLE_PU}, {id_CSA, PINSTYLE_CE},
{id_CSB, PINSTYLE_CE}, {id_RSTA, PINSTYLE_LSR}, {id_RSTB, PINSTYLE_LSR},
{id_WEA, PINSTYLE_LSR}, {id_WEB, PINSTYLE_LSR}, {id_IGN, PINSTYLE_PU},
{id_INITN, PINSTYLE_PU}, {id_STDBYN, PINSTYLE_PU}, {id_TBISTN, PINSTYLE_PU},
{id_SCANCLK, PINSTYLE_DEDI}, {id_SCANRST, PINSTYLE_DEDI}, {id_OPCGLDCK, PINSTYLE_DEDI},
{id_CLK, PINSTYLE_CLK},
{id_CEA, PINSTYLE_CE},
{id_CEB, PINSTYLE_CE},
{id_OCEA, PINSTYLE_PU},
{id_OCEB, PINSTYLE_PU},
{id_CSA, PINSTYLE_PU},
{id_CSB, PINSTYLE_PU},
{id_RSTA, PINSTYLE_LSR},
{id_RSTB, PINSTYLE_LSR},
{id_WEA, PINSTYLE_INV_PD_CIB},
{id_WEB, PINSTYLE_INV_PD_CIB},
{id_IGN, PINSTYLE_PU},
{id_INITN, PINSTYLE_PU},
{id_STDBYN, PINSTYLE_PU},
{id_TBISTN, PINSTYLE_PU},
{id_SCANCLK, PINSTYLE_DEDI},
{id_SCANRST, PINSTYLE_DEDI},
{id_OPCGLDCK, PINSTYLE_DEDI},
{{}, PINSTYLE_CIB},
}}};
} // namespace