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DS90UB954-Q1EVM: Internal Eye monitor setting

Tomoaki Yoshida91
Genius 5255 points
Part Number: DS90UB954-Q1EVM

Hi team,

We use 953-954 in synchronous clock mode.

I connect the board we made to a PC and perform system verification using Margin Analysis with TI GUI.

When the communication rate was 4 Gbps, there was not much margin, so I set the back channel to 25 Mbps as a trial and tried again to 2 Gbps.

Then, the margin was expanded, but the result was that all PASS was done with the one with the larger strobe position l like a 14, 13 and 12.

I was thinking that both fast and slow strobe positions would fail, so I'm not sure if it's correct that all the slow ones pass.

Is there a register that needs to be changed to perform Margin analysis when the back channel is dropped to 25Mbps and it is set to 2Gbps in the 4 Gbps synchronous clock mode setting?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Genius 11340 points
    Hi Yoshida-san,

    Could you provide the screenshots of the results so I can understand it better?

    Margin analysis test is done the same way regardless of the forward channel rate. There's no additional registers you need to program.

    Best,

    Jiashow