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DS90UB928QEVM: pixel clock different with the same condition between EVM and customer's board

Ann_Lien
Genius 11570 points
Part Number: DS90UB928QEVM
Other Parts Discussed in Thread: DS90UB949A-Q1EVM,

Hello expert,

My customer is using DS90UB928EVM and found out below issue.

 (1) (2) DS90UB949A-Q1EVM set up the same 720p test pattern，but (1) and (2) get different pixel clock. customer would like to know why it would be like this. Thanks!

  1. Serializer:  DS90UB949A-Q1EVM (pixel clock 66.667MHz)
    Deserializer:使DS90UB928QEVM  (pixel clock: 71.884MHz)
    refer to DS90UB928QEVM.png
  2. Serializer: DS90UB949A-Q1EVM (pixel clock 66.848MHz)
    Deserializer: ARHUD 1.00 (MAIN BOARD, cusotmer's board)  <IC: DS90UB928QSQX/NOPB> (pixel clock 76.563MHz)
    refer to Unimax.png

Best regards,

Ann Lien

DS90UB928QEVM

Unimax

  • +1
    TI__Mastermind 19860 points

    Hey Ann,

    The pixel clock reading is expected to vary by some percentage. 

    Looking at your information tab, it's showing that you have established link between the 949 and 928 and Local and remote I2C is working as expected, so I don't see any issue here.

    Regards,
    Fadi A.