本程序是实现在用电话卡打电话时进行自动计费的功能，包括检测通话的种类，时间和余额检测等多项功能，此代码用veriloghdl编写已经调试通过编译。-Implementation of this procedure is used when the phone card to call the function of automatic billing, including the detection of the types of calls, time and number of functi