基于MPC8280的CPU单元与内部总线驱动程序设计

Design of CPU unit and its internal bus driverd based on MPC8280

介绍了一种由MPC8280处理器、CAN通信控制器SJA1000和FlexRay通信控制器MFR4310构成的CPU单元及其总线接口驱动程序设计。为了实现CPU单元在分布式飞行控制计算机的内部总线可靠通信,分析了两种总线控制器的读写时序,并采用CPLD设计了接口逻辑。以MFR4310为例,阐述了VxWorks下的总线控制器驱动程序设计和移植。按照样例飞行控制计算机各单元间的通信协议,建立了多节点的测试平台,对满负载的通信情况进行了测试,结果表明接口逻辑正确、驱动程序工作稳定,满足设计要求。

This article introduces a type of CPU unit,constructed by the MPC8280 processor,CAN communication controller SJA1000 and FlexRay communication controller MFR4310,as well as the design of its bus interface and driver.In order to achieve the reliable communication of flight control computer＇s internal bus,the article analyzes the read-write timing of these two types of bus controller,and designs the interface logic with CPLD.Taking MFR4310 for example,article elaborates the design and transplantation of bus controllers＇ driver in VxWorks.In accordance with communication protocols between each unit of the sample flight control computer,the article establishes a multi-node test platform for communication of full load,that shows the interface logic works correctly and the driver is stable as the design required.