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DS110DF410: Vertical lines in internal eye opening monitor results?

Jeroen Hegeman
Prodigy 20 points
Part Number: DS110DF410

Dear all,

The attached image shows the results of an eye scan I performed with the internal eye opening monitor of a DS110DF410, exposed to a link at 10.26 Gb/s (and unless I made a mistake, correctly configured for that rate). I'm puzzled by the vertical lines on the left. The other channels of the same device (driven by different transceivers) show similar (but slightly different) lines. Has anyone seen such a thing before? Does this point to an issue? Or is it a harmless artefact of the EOM algorithm?

Best regards,

Jeroen

eye_opening_scan_data_tx_0.pdf

  • 0
    TI__Guru* 93330 points

    Hi Jeroen,

    This vertical line is artifact of eye density plotting. It seems your eye - on the right hand side - is well open and there is no crossing there. I believe under this condition you should not be getting any bit error. I believe this is harmless and there is no negative side effect.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 20 points

    Thank you Nasser,

    I was not so much worried about the performance of the link, because that indeed seems to work fine (with the retimer well adjusted in the center of the eye, indeed). But the lines are a bit odd. Good to hear confirmed that this is an artefact only.

    Best regards,

    Jeroen