Merge pull request #750 from YosysHQ/gatecat/io-improve

IO improvements for OBUFTDS

1 files changed, 37 insertions, 0 deletions

diff --git a/fpga_interchange/examples/tests/obuftds/obuftds.v b/fpga_interchange/examples/tests/obuftds/obuftds.v
new file mode 100644
index 00000000..d4e9a603
--- /dev/null
+++ b/fpga_interchange/examples/tests/obuftds/obuftds.v
@@ -0,0 +1,37 @@
+module top(
+  input  wire [11:8] sw,
+
+  output wire [1:0]  diff_p,
+  output wire [1:0]  diff_n
+);
+
+wire [1:0] buf_i;
+wire [1:0] buf_t;
+
+OBUFTDS # (
+  .IOSTANDARD("DIFF_SSTL135"),
+  .SLEW("FAST")
+) obuftds_0 (
+  .I(buf_i[0]),
+  .T(buf_t[0]),
+  .O(diff_p[0]),
+  .OB(diff_n[0])
+);
+
+OBUFTDS # (
+  .IOSTANDARD("DIFF_SSTL135"),
+  .SLEW("FAST")
+) obuftds_1 (
+  .I(buf_i[1]),
+  .T(buf_t[1]),
+  .O(diff_p[1]),
+  .OB(diff_n[1])
+);
+
+assign buf_i[0] = sw[ 8];
+assign buf_t[0] = sw[ 9];
+assign buf_i[1] = sw[10];
+assign buf_t[1] = sw[11];
+
+endmodule
+