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Merge pull request #651 from YosysHQ/gatecat/nexus-vcco

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nexus: Fix bank Vcco FASM
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gatecat 2021-03-29 21:32:35 +01:00 committed by GitHub
commit 0b1e089547
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1 changed files with 51 additions and 3 deletions
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54
nexus/fasm.cc
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@ -34,7 +34,10 @@ struct NexusFasmWriter
std::vector<std::string> fasm_ctx;
bool is_lifcl_17;
NexusFasmWriter(const Context *ctx, std::ostream &out) : ctx(ctx), out(out), is_lifcl_17(ctx->args.device.find("LIFCL-17") != std::string::npos) {}
NexusFasmWriter(const Context *ctx, std::ostream &out)
: ctx(ctx), out(out), is_lifcl_17(ctx->args.device.find("LIFCL-17") != std::string::npos)
{
}
// Add a 'dot' prefix to the FASM context stack
void push(const std::string &x) { fasm_ctx.push_back(x); }
@ -722,9 +725,51 @@ struct NexusFasmWriter
}
}
}
std::unordered_map<int, int> bank_vcco;
// bank VccO in mV
int get_bank_vcco(const std::string &iostd)
{
if (iostd == "LVCMOS33" || iostd == "LVCMOS33D")
return 3300;
else if (iostd == "LVCMOS25" || iostd == "LVCMOS25D")
return 2500;
else if (iostd == "LVCMOS18")
return 1800;
else if (iostd == "LVCMOS15")
return 1500;
else if (iostd == "LVCMOS12")
return 1200;
else
return -1;
}
// Write out placeholder bankref config
void write_bankcfg()
{
for (auto c : sorted(ctx->cells)) {
const CellInfo *ci = c.second;
if (ci->type != id_SEIO33_CORE)
continue;
if (!ci->attrs.count(id_IO_TYPE))
continue;
// VccO only concerns outputs
const NetInfo *t = get_net_or_empty(ci, id_T);
auto tmux = ctx->get_cell_pinmux(ci, id_T);
if (tmux == PINMUX_1 || (tmux != PINMUX_0 && t == nullptr))
continue;
int bank = ctx->get_bel_pad(ci->bel)->bank;
std::string iostd = ci->attrs.at(id_IO_TYPE).as_string();
int vcco = get_bank_vcco(iostd);
if (vcco == -1) {
log_warning("Unexpected IO standard '%s' on port '%s'\n", iostd.c_str(), ctx->nameOf(ci));
continue;
}
if (bank_vcco.count(bank) && bank_vcco.at(bank) != vcco) {
log_warning("Conflicting Vcco %.1fV and %.1fV on bank %d\n", bank_vcco.at(bank) / 1000.0, vcco / 1000.0,
bank);
continue;
}
bank_vcco[bank] = vcco;
}
for (int i = 0; i < 8; i++) {
if (i >= 3 && i <= 5) {
// 1.8V banks
@ -739,8 +784,11 @@ struct NexusFasmWriter
} else {
if (is_lifcl_17 && (i != 0) && (i != 1))
continue;
// 3.3V banks, this should eventually be set based on the bank config
write_bit(stringf("GLOBAL.BANK%d.VCC.3V3", i));
auto vcco = bank_vcco.find(i);
if (vcco != bank_vcco.end())
write_bit(stringf("GLOBAL.BANK%d.VCC.%dV%d", i, vcco->second / 1000, (vcco->second / 100) % 10));
else
write_bit(stringf("GLOBAL.BANK%d.VCC.3V3", i));
}
}
blank();