实现的是扭环形十进制计数器，用verilog HDL 语言，在Actel公司提供的LiberoFPGA开发环境下实现，代码经过验证，可在ModelSim中仿真 -Ring is twisted to achieve a decimal counter, using verilog HDL language, Actel offers the LiberoFPGA development environment, the code is validated, the simulation in t