vrilog语言编写，使用状态机模拟乒乓球运动-vrilog language, using the state machine simulation table tennis

用8个LED发光管的来回滚动显示模拟打乒乓球时 乒乓球在两边球台上的来回运动-With 8-LED LED scroll back and forth to play table tennis table tennis simulation on both sides of the ball in motion back and forth on stage

将运动控制卡的方向信号与脉冲信号转换为两路正交方波信号信号（模拟光栅信号）-The direction of the signal and the pulse signal is converted motion control card for two orthogonal square wave signal signal (analog signal raster)