ABB示教器 3HNE00313-1
报价单位:厦门航拓电气有限公司
联系人:戴先生
手机:18006003561(微信同号)
座机:0592-5072089
***:565167042
PCI总线是一种同步的***于处理器的32位或64位局部总线,!高工作频率为33MHz,峰值速度在32位时为132MB/s,64位时为264MB/s,总线规范由PCISIG发布。ISA总线相比,PCI总线和有如下显著的特点:
(1)高速性
PCI局部总线以33MHz的时钟频率操作,采用32位数据总线,数据传输速率可高达132MB/s,远!过以往各种总线。而早在1995年6月推出的PCI总线规范2。l已定义了64位、66MHz的PCI总线标准。因此PCI总线完全可为未来的计算机提供更高的数据传送率。另外,PCI总线的主设备(Master)可与微机内存直接交换数据,而不!经过微机CPU中转,也提高了数据传送的效率。
(2)即插即用性
目前随着计算机技术的发展,微机中留给用户使用的硬件资源越来越少,也越来越含糊不清。在使用ISA板卡时,有两个问题需要解决:一是在同一台微机上使用多个不同厂家、不同型号的板卡时,板卡之间可能会有硬件资源上的冲突;二是板卡所占用的硬件资源可能会与系统硬件资源(如声卡、网卡等)相冲突。而PCI板卡的硬件资源则是由微机根据其各自的要求统一分配,决不会有任何的冲突问题。因此,作为PCI板卡的设计者,不!关心微机的哪些资源可用,哪些资源不可用,也不!关心板卡之间是否会有冲突。因此,即使不
考虑PCI总线的高速性,单凭其即插即用性,就比ISA总线优越了许多。
(3)可靠性
PCI***于处理器的结构,形成一种独特的中间缓冲器设计方式,将***处理器子系统与外围设备分开。这样用户可以随意增添外围设备,以扩充电脑系统而不!担心在不同时钟频率下会导致性能的下降。与原先微机常用的ISA总线相比,PCI总线增加了奇偶校验错(PERR)、系统错(SERR)、从设备结束(STOP)等控制信号及!时处理等可靠性措施,使数据传输的可靠性大为增加。
(4)复杂性
PCI总线强大的功能大大增加了硬件设计和软件开发的实现难度。硬件上要采用大容量、高速度的CPLD或FPGA芯片来实现PCI总线复杂的功能。软件上则要根据所用的操作系统,用软件工具编制支持即插即用功能酶设备驱动程序。
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