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DS125DF1610EVM: Interface forum

Motti Caspi
Prodigy 20 points
Part Number: DS125DF1610EVM
Other Parts Discussed in Thread: DS125DF1610

Dear Lucas,

We don’t have an access to the programming guide. Would you be kind enough sharing it with us.

Assuming the PRBS needs the clock generated by the CDR to be turned on, then we can’t use the DS125Df1610EVB in our application as planned.

Is there a possibility that the PRBS generator will be turned on independently of the clock generated by the CDR (clock REF for instance)?

Please note that the application suggested in:

DS125DF1610EVM: how to use DS125DF1610 as a Bert - Interface forum - Interface - TI E2E support forums  Is misleading,  since based on your information above, my understanding is that the data source to the receiver can’t be the data generated by the PRBS generator located on the same DS125DF1610EVB. I would like to suggest that this should be mention emphatically in the suggested application.

Furthermore, please note that the block diagram of the DS125DF1610 in the data sheet is differ from the block diagram diagram in the EVB GUI (the internal PRBS generator is connected differently) 

 

Obviously the differences are misleading! in the data sheet the PRBS Generator clock is independent from the CDR recovered clock and in the GUI it appears that the PRBS gen is connected the incoming data (?). 

I'm repeating again what is/was our plan:

Thanks

Motti

  • TI__Mastermind 28920 points

    Hi Motti,

    Here is the DS125DF1610 programming guide, sorry this wasn't shared with you earlier.

    3162.DS125DF1610_Programming_Guide_21Aug2014.pdf

    The PRBS generator on the DS125DF1610 requires the CDR to be locked to a high-speed signal at the RX inputs. In the E2E thread you linked, Michael specifically says:

    1. To use the DS125DF1610 as a pattern generator, the RF input (clock signal) should be sent to any of the input Rx channels. The RF input should be a divide-by ratio of the actual data rate you wish to output.

    Therefore, I don't believe this thread is misleading.

    Thanks for pointing out the block diagram differences between datasheet and EVM GUI. The EVM GUI diagram does look a bit misleading because the pattern generator does use the VCO frequency.

    Best,

    Lucas