说明：  基于FPGA的抢答器，VHDL语言设计。 人数任意设置，倒计时任意设置，分频系数任意设置。 数码管显示抢答编号。 蜂鸣器提示。 代码含中文注释。
(FPGA based responder, VHDL language design. The number of people can be set arbitrarily, the countdown can be set arbitrarily, and the frequency division coefficient can be set arbitrarily. The nixie tube displays the answer number. Buzzer prompt. The code contains Chinese comments.)