1 files changed, 2 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";
     }
 }