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HIB25-x4 LEDs: CBL & PWR

Last Updated: Aug 29, 2018 01:19PM PDT
1. What is the proper init sequence for these three sideband signals (not including wake, for now)

Answer:
Host – cbl pwr on
Target – target system power on
Target – Power good triggers CPRSNT
Host – Receive CPRSNT, release CPERST
Both sides start to link

2.   What are the differences between led's "PWR" and "CBL" on the back plate, and "CBL" and "EDGE" on the card itself.

For example, I am able to get "EDGE" to light at host power-up. When I toggle the line PRSNT, the "EDGE" turns off but the "CBL" turns on. How to get both led's on the OSS card to turn on?

Answer:
PWR – Board has power
CBL – Signal detect on cable*
EDGE – Signal detect on card edge*
*Signal detect does not mean it has a link, but rather it identifies there is a signal on the card edge.  If the link does not appear to be stable, it could mean that there is a compliance pattern being generated by the PCIe device interfacing with this card.

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