实现一个10秒倒计时电路，要求使用8*8点阵显示计时结果。在QuartusII平台上设计程序和仿真题目要求，并下载到实验板验证实验结果。-Achieve a 10-second countdown circuit, requires the use of 8* 8 dot matrix display timing results. QuartusII platform in the design process and simulation on the subject request and

256 级灰度LED 点阵屏显示原理及基于FPGA 的电路设计-256 grayscale screen display LED dot matrix theory and circuit design based on FPGA

数字电路与逻辑设计实验。VHDL语言开发电子琴。包括数码管和点阵显示、可以自动播放。-Digital circuit and logic design experiments. VHDL development keyboard. Including digital tube and dot matrix display, can automatically play.