使用VHDL语言，对Altera公司的DE2开发板进行开发，本例实现了对板上7段数码管的显示，在niosiiIDE上基于硬件实现小灯的循环亮灭-Using VHDL language, on Altera s DE2 development board for development, which in this case the realization of paragraph 7 of the on-board digital tube display, in niosiiIDE hardw