Add test cases for co-simulation

tests/sat/grom_computer.v

@@ -0,0 +1,31 @@
+module grom_computer
+  (input  clk,     // Main Clock
+   input  reset,   // reset
+   output hlt,
+   output reg[7:0] display_out
+  );
+
+ wire [11:0] addr;
+ wire [7:0] memory_out;
+ wire [7:0] memory_in;
+ wire mem_enable;
+ wire  we;
+ wire ioreq;
+
+ grom_cpu cpu(.clk(clk),.reset(reset),.addr(addr),.data_in(memory_out),.data_out(memory_in),.we(we),.ioreq(ioreq),.hlt(hlt));
+
+ assign mem_enable = we & ~ioreq;
+
+ ram_memory memory(.clk(clk),.addr(addr),.data_in(memory_in),.we(mem_enable),.data_out(memory_out));
+
+ always @(posedge clk)
+	begin
+		if(ioreq==1 && we==1)
+		begin
+			display_out <= memory_in;
+			`ifdef DISASSEMBLY
+			$display("Display output : %h", memory_in);
+			`endif
+		end
+	end
+endmodule