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DS90UB954-Q1: cable selection for DS90UB954

Gary Teng
Genius 5860 points
Part Number: DS90UB954-Q1


Hi Sir,

 My customer test 4 different coaxial cable for DS90UB954 by using margin analysis gui. Would you please helping to checkj which cable is good for their application? Thanks for your kindly help.

1. 

2.

3.

4.

Best regards,

Gary Teng

  • 0
    TI__Genius 16230 points

    Hi Gary,

    The cables seems to be meeting the requirements for the map. Do you have more information about each cable (manufacture, part number, length and s-parameters)?

    Where measurements taken to make sure that the system is meeting the channel spec requirements?

    Glenn 

  • 0 in reply to Glenn Uranga
    Genius 5860 points

    Hi Gleen,

     You mean all those cables meet spec. right? And can we know how to confirm cable peformance on margin analyzer?

     We'll confirm cable spec.to you later. Thanks for your kindly help.

    Regards,

    Gary

  • 0 in reply to Gary Teng
    TI__Genius 11315 points

    Hi Gary,

    It looks like only cables 1 and 4 are passing the MAP tool. The user guide found here defines the passing criteria. The MAP tool analyzes the link quality of the system (SER -> cable -> DES) by checking for forward channel errors at different EQ and strobe positions, so it allows you to see how different cables affect the link. It does not take into account any back channel errors.

    While the MAP tool is a good indicator of whether your system has enough margin, it is recommended that you measure the IL/RL parameters of the entire system to ensure that it passes the FPD-Link channel specifications. We cannot guarantee that the system will pass based on the MAP tool results alone.

    Regards,

    Cindy

  • 0 in reply to Cindy Li
    Genius 5860 points

    Hi Cindy and Glenn,

     Please check the attached file about workable cable (case 1 / 4). The other cable (case 2/3)  can't display video correctly.

    Regards,

    Gary

    A.D.線材RG-316U 26AWG.PDF

  • 0 in reply to Gary Teng
    TI__Genius 11315 points

    Hi Gary,

    We recommend using the workable cables in your system since they have passing MAP tool results. However, you should also ensure that the entire system (PCB + cable + PCB) can pass the Total Channel Requirements of the FPD-Link Channel Specifications.

    Regards,

    Cindy