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Gowin. BUGFIX. BSRAM SP separation. (#1622)

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* Gowin. BUGFIX. BSRAM SP separation.

The new SP cell must inherit the byte size - 8 or 9 bits.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>

* Gowin. Byte Enables processing in SP.

Single Port with a data width of 32/36 is internally configured as Dual
Port with 16/18. Even and odd words are processed separately by ports A
and B.

With the advent of byte enable support, it became necessary to switch
these signals differently.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>

---------

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
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YRabbit 2026-01-05 20:27:43 +10:00 committed by GitHub
parent 7bd1336f88
commit 1ce187ab5a
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1 changed files with 17 additions and 2 deletions
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17
himbaechel/uarch/gowin/pack.cc
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@ -2800,7 +2800,7 @@ struct GowinPacker
NetInfo *vcc_net = ctx->nets.at(ctx->id("$PACKER_VCC")).get();
NetInfo *vss_net = ctx->nets.at(ctx->id("$PACKER_GND")).get();
IdString cell_type = id_SP;
IdString cell_type = bw == 32 ? id_SP : id_SPX9;
IdString name = ctx->idf("%s_AUX", ctx->nameOf(ci));
auto sp_cell = gwu.create_cell(name, cell_type);
@ -2889,6 +2889,7 @@ struct GowinPacker
}
NetInfo *vcc_net = ctx->nets.at(ctx->id("$PACKER_VCC")).get();
NetInfo *gnd_net = ctx->nets.at(ctx->id("$PACKER_GND")).get();
for (int i = 0; i < 3; ++i) {
ci->renamePort(ctx->idf("BLKSEL[%d]", i), ctx->idf("BLKSEL%d", i));
if (bit_width == 32 || bit_width == 36) {
@ -2899,15 +2900,29 @@ struct GowinPacker
for (int i = 0; i < 14; ++i) {
ci->renamePort(ctx->idf("AD[%d]", i), ctx->idf("AD%d", i));
if (bit_width == 32 || bit_width == 36) {
// Since we are dividing 32/36 bits into two parts between
// ports A and B, the ‘Byte Enables’ require special
// separation.
if (i < 4) {
if (i > 1) {
ci->movePortTo(ctx->idf("AD%d", i), ci, ctx->idf("ADB%d", i - 2));
ci->connectPort(ctx->idf("AD%d", i), gnd_net);
ci->addInput(ctx->idf("ADB%d", i));
ci->connectPort(ctx->idf("ADB%d", i), gnd_net);
}
} else {
ci->copyPortTo(ctx->idf("AD%d", i), ci, ctx->idf("ADB%d", i));
}
}
}
if (bit_width == 32 || bit_width == 36) {
ci->copyPortTo(id_CLK, ci, id_CLKB);
ci->copyPortTo(id_OCE, ci, id_OCEB);
ci->copyPortTo(id_CE, ci, id_CEB);
ci->copyPortTo(id_RESET, ci, id_RESETB);
ci->copyPortTo(id_WRE, ci, id_WREB);
ci->disconnectPort(ctx->id("AD4"));
ci->connectPort(ctx->id("AD4"), gnd_net);
ci->disconnectPort(ctx->id("ADB4"));
ci->connectPort(ctx->id("ADB4"), vcc_net);
}