1 files changed, 16 insertions, 0 deletions
diff --git a/src/alu_b_src_mux.v b/src/alu_b_src_mux.v
new file mode 100644
index 0000000..e7df223
--- /dev/null
+++ b/src/alu_b_src_mux.v
@@ -0,0 +1,16 @@
+module alu_b_src_mux (
+  input [31:0] src_rd2_buf, src_imm,
+  input [1:0] alu_b_src,
+  output reg [31:0] alu_b
+);
+
+always @(*) begin
+  case (alu_b_src)
+    2'b00:   alu_b <= src_rd2_buf;
+    2'b01:   alu_b <= src_imm;
+    2'b10:   alu_b <= 32'h4;
+    default: alu_b <= 32'b0;
+  endcase
+end
+
+endmodule