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ice40: Add budget override for CO->I3 path

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-01-27 14:43:10 +00:00
parent dbaae51159
commit f4d8a25fb7
1 changed files with 23 additions and 0 deletions
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23
ice40/arch.cc
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@ -621,6 +621,29 @@ bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay
}
}
return true;
} else if (driver.port == id_COUT && sink.port == id_I3) {
bool same_y = driver.cell->constr_abs_z && driver.cell->constr_z < 7;
switch (args.type) {
#ifndef ICE40_HX1K_ONLY
case ArchArgs::HX8K:
#endif
case ArchArgs::HX1K:
budget = same_y ? 260 : 560;
break;
#ifndef ICE40_HX1K_ONLY
case ArchArgs::LP384:
case ArchArgs::LP1K:
case ArchArgs::LP8K:
budget = same_y ? 380 : 670;
break;
case ArchArgs::UP5K:
budget = same_y ? 660 : 1220;
break;
#endif
default:
log_error("Unsupported iCE40 chip type.\n");
}
return true;
}
return false;
}