1 files changed, 16 insertions, 0 deletions
diff --git a/src/alu_a_src_mux.v b/src/alu_a_src_mux.v
new file mode 100644
index 0000000..0518e0a
--- /dev/null
+++ b/src/alu_a_src_mux.v
@@ -0,0 +1,16 @@
+module alu_a_src_mux (
+  input [31:0] src_pc, src_pc_buf, src_rd1_buf,
+  input [1:0] alu_a_src,
+  output reg [31:0] alu_a
+);
+
+always @(*) begin
+  case (alu_a_src)
+    2'b00:   alu_a <= src_pc;
+    2'b01:   alu_a <= src_pc_buf;
+    2'b10:   alu_a <= src_rd1_buf;
+    default: alu_a <= 32'b0;
+  endcase
+end
+
+endmodule