CPLD在电脑横机控制器中的应用

Application of CPLD in Computerized Flat Knitter

电脑横机的核心部分是其整机控制系统,有两百多路I/O信号,控制起来相当复杂。若使用传统的器件(例如8255)实现这两百多路I/O集中接入主处理器,集成度会很低,稳定性也不好。提出一种基于CPLD的实现方法,构建其中的工艺执行子系统,代替多块8255器件的互联,实践证明它具有集成度高,稳定性好的优点。一方面软件层的许多工作可以适当下移到CPLD中,由硬件实现,控制更有效;另一方面,CPLD器件的可重复编程的特性也为系统提供了很好的可移植性。

The core part of the computerized jacquard flat knitter is the control system.more than 200 I/O signals exist which are very complicated to handle with.For the problem of more than 200 connections from I/O to main processor,we can also use typical devices（8255,etc）,which has low integration and bad stability as well.Therefore,based on CPLD,a implement subsystem of process is designed to replace the mutual connections of pieces of 8255.The application practice proves the high-density and good performance of CPLD.For one thing,some functions of software platform can be realized by CPLD,with a better efficiency of control.On the other hand,the repeatable programmable property of CPLD also make the whole system transplantable.