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Gowin. Add the ability to place registers in IOB #1403

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merged 8 commits into from
Jan 1, 2025
Merged

Gowin. Add the ability to place registers in IOB #1403

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b82cf51
Gowin. Add the ability to place registers in IOB
yrabbit Dec 8, 2024
79282bd
Gowin. Registers in IO
yrabbit Dec 8, 2024
e08b587
Gowin. IO regs. Verbose warnings.
yrabbit Dec 9, 2024
70a2d95
Gowin. BUGFIX. Fix FFs compatibility.
yrabbit Dec 9, 2024
85210ca
Gowin. FFs in IO. Changing diagnostic messages.
yrabbit Dec 18, 2024
74e7f87
Merge branch 'master' into ioregs-w
yrabbit Dec 31, 2024
1c28394
Gowin. Registers in IO.
yrabbit Dec 31, 2024
ddd2ba6
Gowin. Registers in IO. Fix style.
yrabbit Jan 1, 2025
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21 changes: 21 additions & 0 deletions himbaechel/uarch/gowin/constids.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -1312,3 +1312,24 @@ X(LSREN)

// EMCU
X(EMCU)

// Register placement options
X(IREG_IN_IOB)
X(OREG_IN_IOB)
X(IOREG_IN_IOB)
X(HAS_REG)
X(IREG_TYPE)
X(OREG_TYPE)
X(TREG_TYPE)
X(IREG_CLK_NET)
X(IREG_CE_NET)
X(IREG_LSR_NET)
X(OREG_CLK_NET)
X(OREG_CE_NET)
X(OREG_LSR_NET)
X(TREG_CLK_NET)
X(TREG_CE_NET)
X(TREG_LSR_NET)
X(NOIOBFF)
X(IOBFF)

15 changes: 14 additions & 1 deletion himbaechel/uarch/gowin/gowin.cc
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Expand Up @@ -196,6 +196,17 @@ void GowinImpl::init(Context *ctx)
if (args.options.count("cst")) {
ctx->settings[ctx->id("cst.filename")] = args.options.at("cst");
}

// place registers in IO blocks
if (args.options.count("ireg_in_iob")) {
ctx->settings[id_IREG_IN_IOB] = Property(1);
}
if (args.options.count("oreg_in_iob")) {
ctx->settings[id_OREG_IN_IOB] = Property(1);
}
if (args.options.count("ioreg_in_iob")) {
ctx->settings[id_IOREG_IN_IOB] = Property(1);
}
}

// We do not allow the use of global wires that bypass a special router.
Expand Down Expand Up @@ -811,7 +822,9 @@ inline bool incompatible_ffs(const CellInfo *ff, const CellInfo *adj_ff)
(ff->type == id_DFFNRE && adj_ff->type != id_DFFNSE) ||
(ff->type == id_DFFNP && adj_ff->type != id_DFFNC) || (ff->type == id_DFFNC && adj_ff->type != id_DFFNP) ||
(ff->type == id_DFFNPE && adj_ff->type != id_DFFNCE) ||
(ff->type == id_DFFNCE && adj_ff->type != id_DFFNPE));
(ff->type == id_DFFNCE && adj_ff->type != id_DFFNPE) || (ff->type == id_DFF && adj_ff->type != id_DFF) ||
(ff->type == id_DFFE && adj_ff->type != id_DFFE) || (ff->type == id_DFFN && adj_ff->type != id_DFFN) ||
(ff->type == id_DFFNE && adj_ff->type != id_DFFNE));
}

// placement validation
Expand Down
4 changes: 4 additions & 0 deletions himbaechel/uarch/gowin/gowin.h
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Expand Up @@ -21,6 +21,10 @@ inline bool is_dff(const CellInfo *cell) { return type_is_dff(cell->type); }
inline bool type_is_alu(IdString cell_type) { return cell_type == id_ALU; }
inline bool is_alu(const CellInfo *cell) { return type_is_alu(cell->type); }

// io
inline bool type_is_io(IdString cell_type) { return cell_type.in(id_IBUF, id_OBUF, id_IOBUF, id_TBUF); }
inline bool is_io(const CellInfo *cell) { return type_is_io(cell->type); }

inline bool type_is_diffio(IdString cell_type)
{
return cell_type.in(id_ELVDS_IOBUF, id_ELVDS_IBUF, id_ELVDS_TBUF, id_ELVDS_OBUF, id_TLVDS_IOBUF, id_TLVDS_IBUF,
Expand Down
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