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ecp5: Improve delay model

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-01-08 10:52:03 +00:00
parent 998d055ea7
commit af3ff143be
1 changed files with 4 additions and 3 deletions
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7
ecp5/arch.cc
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@ -448,16 +448,17 @@ delay_t Arch::estimateDelay(WireId src, WireId dst) const
auto src_loc = est_location(src), dst_loc = est_location(dst);
return (240 - 20 * args.speed) * (abs(src_loc.first - dst_loc.first) + abs(src_loc.second - dst_loc.second));
return (110 - 10 * args.speed) + (200 - 20 * args.speed) * (abs(src_loc.first - dst_loc.first) + abs(src_loc.second - dst_loc.second));
}
delay_t Arch::predictDelay(const NetInfo *net_info, const PortRef &sink) const
{
const auto &driver = net_info->driver;
if (driver.port == id_FCO && sink.port == id_FCI)
return 0;
auto driver_loc = getBelLocation(driver.cell->bel);
auto sink_loc = getBelLocation(sink.cell->bel);
return (240 - 20 * args.speed) * (abs(driver_loc.x - sink_loc.x) + abs(driver_loc.y - sink_loc.y));
return (110 - 10 * args.speed) + (200 - 20 * args.speed) * (abs(driver_loc.x - sink_loc.x) + abs(driver_loc.y - sink_loc.y));
}
bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay_t &budget) const { return false; }