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LPC总线

Low Pin Count interface IT8705F Super I/O 芯片。Data sheet 取自 联阳半导体

LPC总线,原名叫Low Pin Count Bus,是在IBM PC兼容机中用于把低带宽装置,连接到CPU上。这些低速设备有:BIOSSuper I/OTPM。LPC总线通常和主板上的南桥物理相连。 LPC总线是Intel在1998时作为工业标准结构(ISA)的替代品引入,它与ISA在软件层面是类似的,尽管在物理层面有着巨大不同,ISA是16bit宽,8.33 MHz的总线,而它是4bit宽,有着四倍频率(33.3 MHz)的总线。

讯号

LPC讯号有START、STOP、CYCTYPE+DIR、IDSEL、TAR、SIZE/MSIZE、ADDR、CHANNEL、DATA及SYNC等:

  • START:是指一个封包(packet)的开始。
  • STOP:一个封包的结束。
  • SYNC:同步等待状态。

参见

外部链接

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LPC总线
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