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DS90UB947-Q1: Auto-detect DS90UB948

Mark Guastaferro
Genius 11645 points
Part Number: DS90UB947-Q1
Other Parts Discussed in Thread: ALP,

Customer is running some bench tests with DS90UB947 EVM and DS90UB948 on their display deserializer board connected to a display. They have three different deserializer board designs, all using the 948 DES. All three designs work in the actual final product with 947 and 949 serializers. 

For the bench tests, they are using the ALP tool to command the 947 pattern generator to send a pattern to the display.  This worked as expected on one of the three deserializer board designs. On the other two boards, an initial link is not established and the ALP tool does not show the 948 DES on the Information tab.

What does the DES need to do in order for the SER to auto detect it? Could they have something set wrong on these deserializer boards to cause detection to fail? 

  • 0
    TI__Mastermind 21535 points

    Hello Mark,

    Who is the tier 1 and OEM for this case?

    Link needs to be established in order for the ALP tool to recognize a DES device. Without link on the two boards in question, ALP will not be able to auto-detect the device since the two devices need link established in order for communication over the back channel to occur. 

    Once the customer is able to establish link on the two boards, ALP should be able to detect the device. On these two boards, is link only lost when using the 947 EVM board and not in the final product?

    Best,

    Nikolas

  • 0 in reply to Nikolas Antonucci
    TI__Genius 11645 points

    How is the link established? It happened automatically when the 947 EVM was connected to one of the deserializer boards. They're trying to figure out what might be wrong on the other deserializer boards which would cause it not to establish a link.  

    It is correct that all the DES boards work in the final product with 947 and 949 production SER boards. 

    OEM is Nikola 

  • 0 in reply to Mark Guastaferro
    TI__Mastermind 21535 points

    Hello Mark,

    Our EVMs are designed as a pair, meaning that the specifications of each EVM device are designed with its respective counterpart SER or DES EVM in mind. With that in mind, there may be a channel specification issue arising between the EVM and the board, causing marginal cases where the devices do not link.

    Could you please provide me with the following information: cabling being used, connector types, components being used on the link (i.e. CMCs).

    Is there a reason the customer is looking to do bench work if they already have the system working in their final setup?

    Best,

    Nikolas

  • 0 in reply to Nikolas Antonucci
    TI__Genius 11645 points

    Hi Nikolas,

    The customers test set up uses Rosenburger connectors and cables. They are working with two cable lengths, one is 5 ft and the other is 7 ft. 

    They are developing a test system for the display supplier.  They currently use equipment from the final product, but a test set-up will be more convenient and improve throughput. Once they get the EVM set-up to work, they will design their own serializer test board.  Towards that end, they have requested the Design Files for the DS90UB947-Q1EVM to speed up the board design.  They use Altium and Orcad.  We have an NDA with the customer. 

  • 0 in reply to Mark Guastaferro
    TI__Mastermind 21535 points

    Hello Mark,

    Regarding the current system, could you please provide me with the schematic and layout of the customer's DES board? Feel free to share with me over E2E private messaging since this thread is public. 

    Regarding the design of their future test board, please allow me until Monday to confirm with my team that I can provide you with the design files. I will send them via E2E private messaging as soon as possible

    Best,

    Nikolas