diff --git a/docs/mips_data_sheet.pdf b/docs/mips_data_sheet.pdf
new file mode 100644
index 0000000..e69de29
diff --git a/rtl/mips_cpu_bus.v b/rtl/mips_cpu_bus.v
new file mode 100644
index 0000000..111a7b3
--- /dev/null
+++ b/rtl/mips_cpu_bus.v
@@ -0,0 +1,16 @@
+module mips_cpu_bus(
+    /* Standard signals */
+    input logic clk,
+    input logic reset,
+    output logic active,
+    output logic[31:0] register_v0,
+
+    /* Avalon memory mapped bus controller (master) */
+    output logic[31:0] address,
+    output logic write,
+    output logic read,
+    input logic waitrequest,
+    output logic[31:0] writedata,
+    output logic[3:0] byteenable,
+    input logic[31:0] readdata
+);
diff --git a/rtl/mips_cpu_harvard.v b/rtl/mips_cpu_harvard.v
new file mode 100644
index 0000000..9442239
--- /dev/null
+++ b/rtl/mips_cpu_harvard.v
@@ -0,0 +1,21 @@
+module mips_cpu_harvard(
+    /* Standard signals */
+    input logic clk,
+    input logic reset,
+    output logic active,
+    output logic [31:0] register_v0,
+
+    /* New clock enable. See below. */
+    input logic clk_enable,
+
+    /* Combinatorial read access to instructions */
+    output logic[31:0] instr_address,
+    input logic[31:0] instr_readdata,
+
+    /* Combinatorial read and single-cycle write access to instructions */
+    output logic[31:0] data_address,
+    output logic data_write,
+    output logic data_read,
+    output logic[31:0] data_writedata,
+    input logic[31:0] data_readdata
+);
\ No newline at end of file
diff --git a/test/test_mips_cpu_bus.sh b/test/test_mips_cpu_bus.sh
new file mode 100644
index 0000000..bee7f43
--- /dev/null
+++ b/test/test_mips_cpu_bus.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# should not create any files in the rtl dir
+# but auxiliary files / dirs can be utilised
\ No newline at end of file
diff --git a/test/test_mips_cpu_harvard.sh b/test/test_mips_cpu_harvard.sh
new file mode 100644
index 0000000..bee7f43
--- /dev/null
+++ b/test/test_mips_cpu_harvard.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# should not create any files in the rtl dir
+# but auxiliary files / dirs can be utilised
\ No newline at end of file