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现代作战飞机对数据处理能力提出了大量的要求。为了满足这种要求,机载系统结构日益需要有多种用途的高可靠、高性能的分布处理节点。这些处理节点采用超高速集成电路/超大规模集成电路(VHSIC/VLSI)器件和表面安装工艺进行高度集成化和模块化设计。本文所述的Unisys/AT&T通用处理部件(GPPE)模块就是这种处理节点的具体实现,它可广泛应用于航空电子系统。 GPPE采用下一代简化指令系统计算机(RISC)微处理机技术,MIPS计算机系统公司的32位指令系统结构(ISA),工作频率为33MHz。该模块采用商用ISA和开放型系统结构,单宽度SEM-E军用模块的功能齐全极为经济有效。它还能让用户买到所需的开发工具。 GPPE还有多层数据安全机制和保护分类数据的多种特点。GPPE所用的6MB SRAM和512KB的EEPROM符合大型RISC寻址空间和实时操作系统的要求。网络总线(N总线)底板接口为分布处理环境中的模块间通信提供低开销的报文传送协议和宽带的通路。GPPE能够支持联合综合航空电子系统工作组(JIAWG)二级维护概念。模块上的维护控制器通过双测试与维护总线(TM总)端口支持模块状态信息的操作报告。单个联合测试功能组(JIAG)接口支持基地测试和若干机内自测试方法都综合在模块上,有很高的故障复盖率和测试可信度。 GPPE适用于要求性能?
Modern combat aircraft pose a number of requirements for data processing capabilities. To meet this demand, airborne system architectures increasingly require highly reliable, high-performance distributed processing nodes with multiple uses. These processing nodes are highly integrated and modular with VHSIC / VLSI devices and surface mount technology. The Unisys / AT & T General Purpose Processing Unit (GPPE) module described in this article is a concrete implementation of this processing node and is widely used in avionics systems. GPPE uses the next generation of reduced instruction set computer system (RISC) microprocessor technology, 32-bit instruction set architecture (ISA) from MIPS Computer Systems, operating at 33 MHz. The module uses a commercial ISA and open system architecture, single width SEM-E military module is extremely cost-effective. It also allows users to buy the required development tools. GPPE also has multiple layers of data security mechanisms and multiple features that protect classified data. The 6MB SRAM and 512KB of EEPROM used by GPPE meet the requirements of large RISC addressing space and real-time operating system. The Network Bus (N-Bus) backplane interface provides low-overhead messaging protocols and broadband access for inter-module communication in distributed processing environments. GPPE is able to support the JIAWG Level II maintenance concept. Maintenance on the Module The controller reports operation of the module’s status information via the Dual Test and Maintenance Bus (TM) port. A single Joint Test Function Group (JIAG) interface support base test and several in-machine self-test methods are integrated in the module with high fault coverage and test confidence. GPPE for performance requirements?