用VHDL语言编程在EPM7128SLC8—15数电实验开发板上实现贪吃蛇游戏，附有EPM7128SLC8—15数电实验开发板的样图-Using VHDL language programming EPM7128SLC8-15 in a few experiments to develop on-board electric realize Snake game, with a few electric EPM7128SLC8-15 development board of the experi