Tool/software:
Hi TI Team,
We are using DS125DF410's onboard VCOs, dividers and PRBS generators to generate PRBS streams at various data rates (6Gbps, 6.25Gbps, 5Gbps, 10Gbps, 12Gbps, 12.5Gbps). Since the free-running VCOs may not be at the right frequencies, we made them right by adjusting the cap and lpf values. So setting the data output at the right rate is not an issue to us. We actually manage to use a 2nd board as a Rx to receive the signals and monitor the eye patterns of the incoming data streams.
However, we noticed that the 6Gbps and sometimes the 6.25Gbps data streams can be unstable as reviewed by the eye patterns (though they are fully locked at the Rx). All other rates are free from such an issue.
The issues happen repeatably to some channels of a Tx board. If a different Tx board is used, the channels that illustrate the issue can be different. We check the chip voltage and confirm that it's at 2.46V. It's further confirmed that the issue is from the Tx not the Rx, because the Tx channel with the issue will cause all the Rx channels to show the same issue on the eye patterns if the Rx channel is connected to that Tx channel.
Could you let us know how can we fix the issues?
Thanks.
Child