MPF-A310P-MJ74BA

MPF-A310P-MJ74BA

MPF-A310P-MJ74BA

MPF-A310P-MJ74BA

1）主机模块上采用双PCI-PCI桥芯片设计，芯片仍选用PCI2050桥接器，遵循PICMG2.7的双系统规范，一片桥芯片经J1、J2扩展出1-7槽，另一片经J4、J5扩展出9-15槽，如图2示。此时该主机模块只能采用前出线形式。

图2 :采用双桥接芯片PC12050的主机摸块

2）主机模块上采用单PCI-PCI桥芯片设计，扩展1-7槽，另设计一模块，插入1-7槽之一，由其再扩展出9-15槽。这种方式实际上是在主板的桥接电路之外又设计了一桥接器模块，将其插入第二级PCI总线中任一槽位，由它再扩展出第三级PCI总线。框图见图3。
通过以上方式利用PCI-PCI桥接电路连接多个PCI段，使Compact PCI系统扩展到数十个插槽，提供了满足工业环境应用要求的高性能的核心系统。

图3:第二个桥接器插入第二级PCI总线的任一槽,扩展出第三级PCI总线

以上简单介绍了Compact PCI系统中主机模块扩展PCI总线的几种方法，可以看出PCI-PCI桥接器在其中起到了重要的桥梁作用。Compact PCI不仅弥补了传统总线标准的不足，而且还为系统设计人员带来了高性能、高可用性的专有体系结构和经济的多级PCI总线。另外，Compact PCI所具备的热插拔、冗余及其很强的电磁兼容性使其在众多的领域都将会有更广阔的前景。

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