用VHDL语言编辑的音乐发生器，可以实现多首音乐的播放。并保存暂停断点。用quartus 打开-Music by VHDL language editor generator, can play more songs. And save the suspended breakpoint. Open with quartus

设计了篮球竞赛30秒计时器。此计时器功能齐全，可以直接清零、启动、暂停和连续以及具有光电报警功能，同时应用了七段数码管来显示时间。此计时器有了启动、暂停和连续功能，可以方便地实现断点计时功能，当计时器递减到零时，会发出光电报警信号。-It designed a 30-second timer basketball competition. This timer functions, can be directly cleared, start, pause, and a row and a ph