这个是DE2_70_TV的例子，把原先的NTSC显示改成了PAL显示，可惜网上没找到具体的说明文档，有些细节还要靠自己专研，总之，靠老师同学朋友都会浪费时间，靠自己才是保险的，虽然慢。-This is DE2_70_TV example, the display changed the original NTSC PAL displays, but unfortunately could not find a specific online documentation, and some det