diff --git a/HDL/common/digital_io_hd.v b/HDL/common/digital_io_hd.v
index 8e5be55..e1b6ea9 100644
--- a/HDL/common/digital_io_hd.v
+++ b/HDL/common/digital_io_hd.v
@@ -34,7 +34,7 @@ module EMBEDDED_IO_HD (
   wire SOC_DIR_N;
 
   // Use drive-strength 4 for a high fan-out from SoC components
-  sky130_fd_sc_hd__or2b_1 ISOL_EN_GATE (.B_N(IO_ISOL_N),
+  sky130_fd_sc_hd__or2b_4 ISOL_EN_GATE (.B_N(IO_ISOL_N),
                                         .A(FPGA_DIR),
                                         .X(SOC_DIR)
                                         );
diff --git a/TESTBENCH/digital_io_hd_test/digital_io_hd_test.v b/TESTBENCH/digital_io_hd_test/digital_io_hd_test.v
new file mode 100644
index 0000000..088ade4
--- /dev/null
+++ b/TESTBENCH/digital_io_hd_test/digital_io_hd_test.v
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:772a5684e323a0acb7fce40d406a2e38ccec6ff03b7037fcd28ca3080b80079b
+size 5328
diff --git a/TESTBENCH/digital_io_hd_test/digital_io_hd_test_include_netlists.v b/TESTBENCH/digital_io_hd_test/digital_io_hd_test_include_netlists.v
new file mode 100644
index 0000000..962bab8
--- /dev/null
+++ b/TESTBENCH/digital_io_hd_test/digital_io_hd_test_include_netlists.v
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:19837156754b79fa200291b62ff5efc0e643a2eba639f111a0950aa03522c944
+size 513