module sim_three;				// file ¡°sim_three.v¡±

reg [5:0] OP;
reg [5:0] Func;
reg [31:0] A, B;
reg [4:0] shamt;

wire [1:0] ALUOp;
wire [3:0] ALUctl;
wire M1, M2, M3, M4, W1, W2, W3, N1, N2;
wire [31:0] ALUOut;
wire Zero;


control CTRL (OP, M1, ALUOp, M2, M4, N1, N2, W2, W3, W1, M3);
aluctrl ALUCTL (ALUOp, Func, ALUctl);
alu ALU (ALUctl, A, B, shamt, ALUOut, Zero);

initial begin
	OP = 6'b0;	
	Func = 6'h20;				// add
	shamt = 5'd0;
	A = 32'd13;		
	B = 32'd20;
	#1;
	$display("   ADD");
	$display("ALUOut = (33) ", ALUOut);	// 33 or 0x21 or 0000 0000 0010 0001
	$display("Zero = (0) ", Zero);		// 0


	//OP = 6'b0;	
	Func = 6'h27;				// nor
	//shamt = 5'd0;
	//A = 32'd13;		
	//B = 32'd20;
	#1;
	$display("   NOR");
	$display("ALUOut = (-30) ", ALUOut);	// -30 or 0xffe2 or 1111 1111 1110 0010
	$display("Zero = (0) ", Zero);		// 0


	OP = 6'b101011;	
	//Func = 6'h27;				// sw
	//shamt = 5'd0;
	A = 32'd13;		
	B = 32'd20;
	#1;
	$display("   SW");
	$display("ALUOut = (33) ", ALUOut);	// 33
	$display("Zero = (0) ", Zero);		// 0



	OP = 6'b000101;	
	//Func = 6'h27;				// bne
	//shamt = 5'd0;
	A = 32'd13;		
	B = 32'd20;
	#1;
	$display("   BNE");
	$display("ALUOut = (-7) ", ALUOut);	// -7
	$display("Zero = (0) ", Zero);		// 0
	$finish;
end

endmodule