diff options
| -rw-r--r-- | ice40/arch.cc | 2 | ||||
| -rw-r--r-- | ice40/arch_place.cc | 21 | ||||
| -rw-r--r-- | ice40/archdefs.h | 5 | ||||
| -rw-r--r-- | ice40/constids.inc | 1 |
4 files changed, 29 insertions, 0 deletions
diff --git a/ice40/arch.cc b/ice40/arch.cc index 7ce967ec..43a3dec2 100644 --- a/ice40/arch.cc +++ b/ice40/arch.cc @@ -975,6 +975,8 @@ void Arch::assignCellInfo(CellInfo *cell) cell->lcInfo.inputCount++; if (get_net_or_empty(cell, id_I3)) cell->lcInfo.inputCount++; + } else if (cell->type == id_SB_IO) { + cell->ioInfo.lvds = str_or_default(cell->params, id_IO_STANDARD, "SB_LVCMOS") == "SB_LVDS_INPUT"; } } 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); diff --git a/ice40/archdefs.h b/ice40/archdefs.h index 8e20de23..c04033e7 100644 --- a/ice40/archdefs.h +++ b/ice40/archdefs.h @@ -144,6 +144,11 @@ struct ArchCellInfo int inputCount; const NetInfo *clk, *cen, *sr; } lcInfo; + struct + { + bool lvds; + // TODO: clk packing checks... + } ioInfo; }; }; diff --git a/ice40/constids.inc b/ice40/constids.inc index adcea7ad..dad08e59 100644 --- a/ice40/constids.inc +++ b/ice40/constids.inc @@ -435,3 +435,4 @@ X(ICESTORM_SPRAM) X(DFF_ENABLE) X(CARRY_ENABLE) X(NEG_CLK) +X(IO_STANDARD)
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