1 files changed, 23 insertions, 3 deletions
diff --git a/backends/firrtl/test.v b/backends/firrtl/test.v
index 3e294e3d5..1c7088ab8 100644
--- a/backends/firrtl/test.v
+++ b/backends/firrtl/test.v
@@ -1,4 +1,24 @@
-module test(input clk, signed input [7:0] a, b, x, output [15:0] s, d, y, z, u, q);
-  assign s = a+{b[6:2], 2'b1}, d = a-b, y = x, z[7:0] = s+d, z[15:8] = s-d;
-  always @(posedge clk) q <= s ^ d ^ x;
+module test(
+	input clk, wen,
+	input [4:0] waddr, raddr,
+	input [31:0] wdata,
+	output reg [31:0] rdata,
+	signed input [7:0] a, b, x,
+	output [15:0] s, d, y, z, u, q
+);
+	reg [31:0] memory [0:31];
+
+	always @(posedge clk) begin
+		rdata <= memory[raddr];
+		if (wen) memory[waddr] <= wdata;
+	end
+
+	assign s = a+{b[6:2], 2'b1};
+	assign d = a-b;
+	assign y = x;
+	assign z[7:0] = s+d;
+	assign z[15:8] = s-d;
+
+	always @(posedge clk)
+		q <= s ^ d ^ x;
 endmodule