USB 3.0 voltage swing tunning

[pavel_drabek]

How I can tune voltage swing to pass USB 3.0 compliance?

I am getting only: PeakToPeakVoltage (5G) (Short Channel) [32241] 63.3 mV, while Pass Limits: [100.0 mV to 1.2000 V]

Thank you.

Best regards

Pavel

[pavel_drabek · Accepted solution]

OK, got it, this is the magic:

1) Boot linux

2) memtool 0x5b198004=0x3f

3) memtool 0x5b198030=0x03

4) Plug USB fixture and conduct measurements

[giuseppepagano1]

Hi Pavel,

thank you for sharing your solution. We are facing the same issue on our custom board based on imx8QM.

Can I ask you where did you find this information or USB3.0 PHY register map?

Thank you in advance.

Best Regards

Giuseppe Pagano