基于NIOS II 的DE1开发板的VGA 控制器VGA控制模块主要控制VGA模块的开始和其运行的状态，需要写一个Avalon 从端口响应CPU的控制信号，继而控制整个模块的运行，-Based on the DE1 of the NIOS II development board VGA controller to control the VGA module VGA main control module and its operation began, and the need to write a response to Avalon from the CPU ports of the control signal, and then control the operation of the entire module,