1 files changed, 8 insertions, 3 deletions
diff --git a/techlibs/xilinx/cells_sim.v b/techlibs/xilinx/cells_sim.v
index e6e15b16e..8b0c913aa 100644
--- a/techlibs/xilinx/cells_sim.v
+++ b/techlibs/xilinx/cells_sim.v
@@ -33,8 +33,12 @@ module IBUF(
     output O,
     (* iopad_external_pin *)
     input I);
-  parameter IOSTANDARD = "default";
-  parameter IBUF_LOW_PWR = 0;
+  parameter CCIO_EN = "TRUE";
+  parameter CAPACITANCE = "DONT_CARE";
+  parameter IBUF_DELAY_VALUE = "0";
+  parameter IBUF_LOW_PWR = "TRUE";
+  parameter IFD_DELAY_VALUE = "AUTO";
+  parameter IOSTANDARD = "DEFAULT";
   assign O = I;
   specify
     (I => O) = 0;
@@ -56,7 +60,8 @@ module OBUF(
     (* iopad_external_pin *)
     output O,
     input I);
-  parameter IOSTANDARD = "default";
+  parameter CAPACITANCE = "DONT_CARE";
+  parameter IOSTANDARD = "DEFAULT";
   parameter DRIVE = 12;
   parameter SLEW = "SLOW";
   assign O = I;