VHDL实验四，设计一个异步清零和同步时钟使能的4位加法计数器-VHDL Experiment 4, an asynchronous reset and synchronous design clock enable 4-bit adder counter

VHDL实验四，设计一个异步清零和同步时钟使能的4位加法计数器-VHDL Experiment 4, an asynchronous reset and synchronous design clock enable 4-bit adder counter

8位上下同步计数器 适宜小型练手操作 易于理解(an 8-bit up and down synchronous counter in VHDL with the following features: (1) The same ports are used for signals to be inputted and outputted. The ports are bi-directionally buffered (three-state). (2) The counter is