One is devised as a varible modulus counter based on the principle of maximal-length FSR counter,and the other is devised as a controller which produces state varible and red and green light signs.

• 一片GAL做成基于“最大长度移位寄存器型计数器”的可变模计数器，一片GAL做成控制器产生状态变量及红绿灯信号。