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[FAQ] DS90UB947-Q1: Does device enable OLDI port input even Link detect status (0x0c bit[0]=1b'0 ) is low??

Harry Shin1
Expert 4800 points
Part Number: DS90UB947-Q1

Hi Team

My customer is developing 947 <->948 for CID application.

now they met some issue that 

when they test 947 with their tester display module with 948, 0x0c bit[0] is high and display is OK.

but when they test 947 with customer display module with 948 0x0c bit[0] is low and display also OK. and customer cannot access to DES via BCC.

As I experienced from 949, if Link detect status is failed, HDMI Input port was not enabled. so display was NG.

Does device enable OLDI port input even Link detect status (0x0c bit[0]=1b'0 ) is low?? so this doesn't care Link detect status for outputting data on Link channel??

Thanks~

  • 0
    TI__Mastermind 19720 points

    Hi,

    The "LINK Detect Port0/Port1" (0x0C[0]) register says if the device detects a back channel signal. If the "LINK Detect Port0/Port1" register is a 0 this means that for some reason it did not detect a back channel signal. The 947 should still send out the forward signal regardless of if there is a back channel signal. Please verify that you are following the startup procedures in the "Power-Up Requirements and PDB Pin" section of the 947 and 948 datasheet?

    Regards,

    Michael W.

  • 0 in reply to Michael.Walker
    TI__Expert 4800 points

    Thanks Michael,

    Let me check power up requirement for those devices first.