Hi Sirs,
Sorry to bother you.
We have a backplane case recently, we use the TI TUSB522P redriver.
Each paired with Intel APL and Kaby-Lake board, and found that the board with Intel Kaby-Lake will not be recognized by the device.
And with the Intel APL board, you can recognize the device.
In addition, the TX compliance test eye diagram of this case has a test pass
Verify the RX channel with the Intel iEMT tool and find that with the Intel APL board, High/Low will have a NO Value status.
With the Kaby-Lake board, you can't use iEMT to verify because you can't recognize the device.
At present, attempts have been made to adjust settings such as EQ/DE, but all have the same situation.
I don't know if you have this experience with Intel Kaby-Lake or APL. Is there any need to pay attention to it, or where the BIOS needs additional adjustment?
Our schematic as below
