用 vhdl 语言设计 8 位数码扫描显示电路，显示输出数据直接在程序中给出。增加 8 个 4 位锁存器作为输出显示数据缓冲器，由外部输入8个待显示的十六进制数。-Design with vhdl language display 8-bit digital scanning circuit, display output data are given directly in the program. Increased eight 4-bit latch display data buffer as the output from the external input 8 to be displayed in hexadecimal.