基于CPLD和ISA总线的IO端口扩展

IO Port Extension Based on CPLD and ISA Bus

提出了一种使用复杂可编程逻辑器件(CPLD)实现ISA总线扩展IO端口的解决方案,分析了ISA通信接口、输入输出接口和控制单元设计要点,同时给出读写数据流程。设计的端口扩展模块稳定可靠。

A solution of IO port extension based on complex programmable logic device(CPLD) and ISA bus is presented in this paper which analyze the key design points of ISA communication interfaces, input/output interface and control unit. The flow of read and write data is given in this paper, too. The designed port expansion module is stable and reliable.