Forum Discussion

SJadh1's avatar
SJadh1
Icon for New Contributor rankNew Contributor
7 years ago

Frequent loss of transceiver CDR lock

Hello, I am using Arria10 GX development kit. I am working on USB protocol. I have configured transceiver in pcs direct mode. I am seeing that transceiver lose CDR lock(lockedtodata) signal frequen...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
7 years ago

Hi ,

Regarding the point#3, you would need to use oscilloscope to probe both the recovered clock from the CDR ie rx_pma_clkout and the input refclk to CDR to check for phase difference.

As for the CDR ppm tolerance, the max is =/-1000ppm only. You may refer to the device datasheet -> "CDR PPM tolerance" section for further details.

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin