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翻页清屏
翻页清屏需要另加一个接口。之前的很难做到翻页就清屏。
ChangePages
当换行超过屏幕大小时，需要刷新屏幕。如果一次刷新整个屏幕会导致周期过长VGA不能理解现实。可以采取循环数组和偏移来解决。
VGAtest
MainController
完成MainController并测试
在constantIF中添加对应控制信号
command line
读出时钟周期：把平面划分为30*80网格，每个网格存放一个字符。确定像素属于哪个网格，这个网格是什么字符。然后在得出这个像素的RGB值。
写入时钟：更改某一网格为输入字符。
网格存放字符通过寄存器实现。
IMController
实现第一个元件IMController并测试。IMController的作用是控制ram2的读、写操作
vga_test
处理vga内部各部件连接问题。和上板子测试。
加入光标
光标按规律闪动；光标在写入字符后的第二个周期进行字符修改。光标也是一个特殊的字符。
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