diff options
Diffstat (limited to 'ice40/arch_place.cc')
| -rw-r--r-- | ice40/arch_place.cc | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/ice40/arch_place.cc b/ice40/arch_place.cc index a050e39f..b436f7d7 100644 --- a/ice40/arch_place.cc +++ b/ice40/arch_place.cc @@ -139,6 +139,27 @@ bool Arch::isValidBelForCell(CellInfo *cell, BelId bel) const } } } + Loc ioLoc = getBelLocation(bel); + Loc compLoc = ioLoc; + compLoc.z = 1 - compLoc.z; + + // Check LVDS pairing + if (cell->ioInfo.lvds) { + // Check correct z and complement location is free + if (ioLoc.z != 0) + return false; + BelId compBel = getBelByLocation(compLoc); + CellInfo *compCell = getBoundBelCell(compBel); + if (compCell) + return false; + } else { + // Check LVDS IO is not placed at complement location + BelId compBel = getBelByLocation(compLoc); + CellInfo *compCell = getBoundBelCell(compBel); + if (compCell && compCell->ioInfo.lvds) + return false; + } + return getBelPackagePin(bel) != ""; } else if (cell->type == id_SB_GB) { NPNR_ASSERT(cell->ports.at(id_GLOBAL_BUFFER_OUTPUT).net != nullptr); |