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DS90UH949-Q1: Is there any way to know HDMI detect at DES side?

Harry Shin1
Expert 6210 points
Part Number: DS90UH949-Q1

Hello team,

My customer has quick question.

They are using uh949 and uh940 and SOC will be located in DES board. so SER-DES  SW programing will be implement at DES via BCC.

OEM requires below

Is there any way to inform HDMI detect event to DES from SER??

I think SER has 0x50 bit[7] but this is not interrupt method to DES.

Can you share your idea if any idea here??

Thank you.

  • 0
    TI__Genius 16695 points

    Hi Harry,

    Monitoring reg 0x34[6] on the DES might be a possible solution. This register can indicate when a DES device is connected to the SER (even if active video is not being transmitted). To implement this, they will need to set 0x34[6] to 0 and then monitor the LOCK pin. Once the SER is connected to HDMI, LOCK will go high. It will remain high until either a) connection with the SER is lost or b) the SER is disconnected from its HDMI input.

    Would this work for the OEM's requirements?

    Best,

    Nikolas

  • 0 in reply to Nikolas Antonucci
    TI__Expert 6210 points

    Hello Nikolas,

    Thanks for your support.

    As I know, FPD device has 2 options for LOCK. one is to know connection status(0x34) between SER and DES.

    another LOCK(0x1c or LOCK pin) is to know LOCK status with video data from SER.

    Because 0x34 only shows SER DES connection status so it cannot know if HDMI source is outputting data to SER. so we need to check 0x34 as well as LOCK pin. 

    but limited thing is that HDMI source can be connected to SER without video stream data from HDMI source. in this case, even we can know SER-DES connection status, we cannot know HDMI source detection event.

    I think your proposal is based on LOCK pin can be representative item to know HDMI device detection event.

    Is my understanding correct?

    Thank you

  • +1 in reply to Harry Shin1
    TI__Genius 16695 points

    Hi Harry,

    Yes, your understanding is correct regarding the previously proposed approach. However, as you said, it does have that limiting factor which causes it to not fully satisfy the OEM's requirements.

    An alternative solution seems to be something that you actually already touched on it in your original approach. Registers on the SER can be remotely read on the DES via I2C communication. Assuming that they have I2C access on the DES side, they could simply remotely read 0x50[7] from the SER side on the DES. 0xC[2] and 0x5A[0:3] are other alternative registers on the SER that can be remotely read on the DES and also meet the OEM's requirements of having the DES detect that an HDMI device has been connected.

    Best,

    Nikolas