module rom(input [19:0] address,output wire [15:0] data ,input rd,input cs);
reg [15:0] memory [0:599];
initial begin
	string boot_code;
	if(!$value$plusargs("BOOT_CODE=%s",boot_code))
		boot_code="boot_code.txt";
	$readmemh(boot_code, memory);
end
assign data = !rd & !cs ? memory[address]: 'hz;
endmodule