VHDL描述4*4标准矩阵键盘扫描读取并点亮对应的LED灯，试验已经通过。可能还差一些按键的防抖，但不影响整体测试-VHDL descr iption of the standard 4* 4 matrix keyboard scan read and the corresponding LED lights lit the pilot had been adopted. Stabilization may be even worse some of the buttons, it does n