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DS90UB953-Q1: Monitoring forward channel eye diagram in BIST mode

Takahiro Saito
Expert 5455 points
Part Number: DS90UB953-Q1

Hi team,

Customer wants to check the eye diagram in forward channel for test in the prototype phase.

When BIST mode is used, DS90UB953 outputs pseudo random sequence. To set BIST mode, it seems DS90UB954 is required. For just checking the output eye diagram of forward channel, I want to enable BIST mode without DS90UB954.

Can DS90UB953 output pseudo random sequence if LOCAL_BIST_EN is set to "1" without DS90UB954? If it works, I will connect DS90UB953 output to digital oscillo for monitoring output.

Regards,

Saito

  • 0
    TI__Guru** 108100 points

    Hello Saito-san,

     I am not sure if this will work properly. Normally BIST will need both devices, SER and DES, to work properly!

    Nevertheless, I would recommend you use the Pattern generator in the 953. You can activate it without the DES and do your measurement.

     

    For more details, please refer to section "7.6 Pattern Generation" in the 953 d/s.