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DS90UB948-Q1: MAP analysis questions

Betty Guo
Expert 7300 points
Part Number: DS90UB948-Q1
Other Parts Discussed in Thread: ALP

Hi team,

I have question about MAP analysis of ALP, see the below picture, that is in A/N snla301.

why the first one is recommended while the third is not recommended?

as the third picture say the EQ level is fewer than three, but, the first one also less than three? is there mistake?

  • 0
    TI__Mastermind 19720 points

    Hi,

    "TI recommends having a margin of at least three EQ levels with four passing strobe positions, including a contiguous rectangle of passing states that measures two EQ levels by four strobe positions."

    The first has 3 EQ levels with four passing strobe positions and 2 contiguous EQ levels with 4 strobe positions.

    The second has 3 EQ levels with four passing strobe positions and does not have 2 contiguous EQ levels with 4 strobe positions.

    The third only has 2 EQ levels with four passing strobe positions 

    Regards,

    Michael W.

  • 0 in reply to Michael.Walker
    TI__Expert 7300 points

    understood, many thanks.