New Contributor
Regular ContributorHi,
As I understand it, you have some inquiries related to our C10GX RX CDR in lock-to-ref mode. For your information, when the CDR is manually forced to lock-to-ref mode, the CDR is not tracking the incoming data. We cannot guarantee if the data will still be sampled correctly. As I understand it, I have come across cases where the incoming data rate is lower than the supported range of CDR, the application will put CDR to lock-to-ref mode and recover the data using custom logic.
Therefore, specific to your target implementation, I am not sure if the CDR is able to sample the data correctly since the CDR is not intended to sample data at lock-to-ref mode. If you have a C10GX hardware available, you might want to perform some tests to check out if your target implementation could work. Sorry for the inconvenience.
Please let me know if there is any concern. Thank you.
Best regards,
Chee Pin
New ContributorThanks for your response.
Basically it is not serial digital data, that is the reason for my question. It is not the common usage of transmitting/receiving serial data.
It is a totally asynchronous stream of pulses, not synchronous to any clock. So I do not want to lock the CDR to the data... I just need to disable CDR completely and over-sample the input continuously at 10 GHz.
Is it possible to operate the receiver this way? My assumption is it requires the "lock to ref" mode, but I especially want to make sure the receiver will provide data output to the fabric in this mode. Also I assume the PCS should be bypassed with PCS-direct mode.
Thanks
