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As searching on the Internet, I found that the PCI group has released the "PCIe External cabling specifications". But I can not download the document because I am not a member of the PCI group. So, please help me explain these PCIe to MiniSAS HD's signals below :

  • PWR
  • MGTPWR
  • CBLPRSNT#
  • CADDR
  • CINT#
  • CMISDA
  • CMISCL

Can anyone share the document or reference design?

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1 Answer 1

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From this user guide for an external PCIe product, it describes the signals as follows:

  • PWR: Power to support AOC and signal conditioning components within the cable assembly.
  • MGTPWR: Power supplied to the connector for cable management components that are needed while the link is not active. This needs to be active if the subsystem has power.
  • CBLPRSNT#: Cable present detect, an active-low signal pulled-down by the cable when it is inserted into the connector.
  • CADDR: Signal used to configure the upstream cable management device address.
  • CINT#: Signal asserted by the cable assembly to indicate a need for service via the CMI controller.
  • CMISDA: Management interface data line. Used for both initial link setup and sideband messages when used with CMI compliant cables.
  • CMISCL: Management interface clock line. Used for both initial link setup and sideband messages when used with CMI compliant cables.
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  • \$\begingroup\$ Yes, thanks so much. But, How can I design with these signals? Can you share with me the PCIe external cabling specifications? \$\endgroup\$ Commented Apr 8, 2021 at 9:39

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