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Added tying unused LUT pins to preferred constant instead of Vcc

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Signed-off-by: Maciej Kurc <mkurc@antmicro.com>
This commit is contained in:
Maciej Kurc 2022-05-11 15:50:18 +02:00
parent aafe1a176c
commit 7c7a4f0959
1 changed files with 8 additions and 2 deletions
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10
fpga_interchange/luts.cc
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@ -428,7 +428,10 @@ bool LutMapper::remap_luts(const Context *ctx, SiteLutMappingResult *lut_mapping
for (size_t bel_pin_idx = 0; bel_pin_idx < lutBel.pins.size(); ++bel_pin_idx) { for (size_t bel_pin_idx = 0; bel_pin_idx < lutBel.pins.size(); ++bel_pin_idx) {
if ((used_pins & (1 << bel_pin_idx)) == 0) { if ((used_pins & (1 << bel_pin_idx)) == 0) {
NPNR_ASSERT(bel_to_cell_pin_remaps[cell_idx][bel_pin_idx] == -1); NPNR_ASSERT(bel_to_cell_pin_remaps[cell_idx][bel_pin_idx] == -1);
cell.lutCell.pin_connections.emplace(lutBel.pins.at(bel_pin_idx), LutCell::PinConnection::Vcc); cell.lutCell.pin_connections.emplace(lutBel.pins.at(bel_pin_idx), LutCell::PinConnection::Const);
}
else {
cell.lutCell.pin_connections.emplace(lutBel.pins.at(bel_pin_idx), LutCell::PinConnection::Signal);
} }
} }
} }
@ -438,7 +441,10 @@ bool LutMapper::remap_luts(const Context *ctx, SiteLutMappingResult *lut_mapping
if ((pin_mask & (1 << bel_pin_idx)) != 0) { if ((pin_mask & (1 << bel_pin_idx)) != 0) {
NPNR_ASSERT(bel_to_cell_pin_remaps[cell_idx][bel_pin_idx] == -1); NPNR_ASSERT(bel_to_cell_pin_remaps[cell_idx][bel_pin_idx] == -1);
auto pin = lutBel.pins.at(bel_pin_idx); auto pin = lutBel.pins.at(bel_pin_idx);
cell.lutCell.pin_connections.emplace(pin, LutCell::PinConnection::Vcc); cell.lutCell.pin_connections.emplace(pin, LutCell::PinConnection::Const);
}
else {
cell.lutCell.pin_connections.emplace(lutBel.pins.at(bel_pin_idx), LutCell::PinConnection::Signal);
} }
} }
} }