通过对VGA 接口的显示控制设计，理解VGA 接口的时序工作原理，掌握通过计数器产

生时序控制信号的方法以及用MEGEFUNCTION 制作锁相环的方法。-Through the VGA display control interface design, understanding the timing works VGA interface, timing control method of generating control signals produced by the counter and phase-locked loop with MEGEFUNCTION method.