....mem_access_addr(ALU_out),
.mem_write_data(reg_read_data_2),.mem_write_en(mem_write),.mem_read(mem_read),
.mem_read_data(mem_read_data));
// write back
assign reg_write_data = (mem_to_reg == 2'b10) ? pc2:((mem_to_reg == 2'b01)? mem_read_data: A...
