SPP外围子系统的设计与实现

DESIGN AND IMPLEMENTATION OF SPP I/O SUB SYSTEM

并行处理机外围子系统的设计和实现技术直接影响整个系统的性能价格比，本文根据ＳＰＰ体系结构的特点和实际应用需要，在前端服务器与ＳＭ／ＳＳＭ之间设计了专用的Ｉ／Ｏ处理机，使得系统Ｉ／Ｏ设备与ＳＭ／ＳＳＭ之间直接进行高速数据传送，从而大大提高系统的Ｉ／Ｏ性能。在Ｉ／Ｏ处理机的设计中，采用了ｉ８６０＋８２３８０＋ＳＲＡＭ的总体结构，从而实现了处理机访问主存和ＤＭＡ控制器访问ＳＲＡＭ之间的并行。

The design and implementation of I/O subsystem influence dirctly the performance/price rate of parallel processing system.According to the characteristic of SPP architecture and applied requirements,this paper proposes to add special I/O processors between servers and SM/SSM to realize the high speed DMA data transferring and thus improve I/O performance.We design an effective I/O processors composed of i860,82380 and SRAM.This method supports parallel execution of processors and DMA Controllers.