摘要
着重讨论用GAL器件实现对所设定电话号码的限拨.通过对电话号码识别和限拨的状态分析,采用ABEL语言编写出限拨程序并配合硬件实现限拨功能.
The authors emphatically discuss the limitation of the dial to the provided telephone number with GAL and programs to the limitation of the dial with ABEL language realize the function of the limitation of the dial with the hardware by analysing the state so as to distinguish and limit the dial to the telephone number.
