1 files changed, 41 insertions, 0 deletions
diff --git a/testbenches/cpu_tb.sv b/testbenches/cpu_tb.sv
new file mode 100644
index 0000000..6f936b1
--- /dev/null
+++ b/testbenches/cpu_tb.sv
@@ -0,0 +1,41 @@
+`define M_NOP 2'b00
+`define M_READ 2'b10
+`define M_WRITE 2'b01
+
+module cpu_tb;
+	reg err, clk, reset;
+
+	tb_top DUT(clk, reset);
+
+	initial forever begin
+		clk = 0; #5;
+		clk = 1; #5;
+	end
+
+	initial begin
+		#2000;
+		$display("Time limit reached.\n");
+		$stop;
+	end
+
+	initial begin
+		reset = 1'b1;
+		#10;
+		reset = 1'b0;
+	end
+endmodule: cpu_tb
+
+module tb_top(input clk, input reset);
+	wire write, N, V, Z;
+	wire [1:0] mem_cmd;
+	wire [8:0] mem_addr;
+	wire [15:0] din, dout, mem_data;
+
+	ram #(16, 8, "data_cpu_tb.txt") MEM(clk, mem_addr[7:0], write, din, dout);
+	cpu CPU(clk, reset, mem_data, mem_cmd, mem_addr, din, N, V, Z);
+
+	assign mem_data = (mem_cmd == `M_READ & ~mem_addr[8])
+		? dout : {16{1'bz}};
+	assign din = {16{1'bz}};
+	assign write = mem_cmd == `M_WRITE & ~mem_addr[8];
+endmodule: tb_top