• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 273 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UH947-Q1: LOCK Monitoring with 948

Jared Becker
Genius 11845 points
Part Number: DS90UH947-Q1

Hi Team,

I am trying to understanding the best way to monitor LOCK between a 947 and 948. Can you please help with the questions below?

  1. Below are the registers and pins I have identified for both the 947 and 948 to look for LOCK/loss of LOCK. Are there any others I have missed?
  2. Is there anyway to latch a register or bit if loss of LOCK occurs?
  3. Is there anyway to configure an interrupt to the SoC if loss of LOCK occurs?

947

No physical pin indicates LOCK

 

948

 

Thank you,

Jared

  • 0
    TI__Genius 12866 points

    Hi Jared,

    If you are using UH device, the SoC can monitor 947 register 0xC4[5]. Interrupt from reg 0xC6 and 0xC7[6] can be used as well to alert SoC.

    For interrupt, make sure to set HDCP_CFG:RX_DET_SEL to 1 so that the interrupt will report receiver lock status.

    Best Regards,

    Charley Cai

  • 0 in reply to Charley Cai
    TI__Genius 11845 points

    Hi Charley,

    Is the answer to question #2, "No"?

    For registers 0xC6 and 0xC7[6], how does this actually create the interrupt to the processor? Which pin sends the interrupt? Will it send the interrupt if the LOCK is lost, or only when LOCK is established?

    -Jared

  • 0 in reply to Jared Becker
    TI__Genius 12866 points

    Hi Jared,

    Yes, there's no "latch" register for loss of lock on these devices.

    The interrupt event goes on to INTB pin. The interrupt will flag both lock and loss of lock. 

    When INTB is triggered, processor can go read 0xC4 to understand whether the event is for lock or loss of lock. 

    Best Regards,

    Charley Cai

  • 0 in reply to Charley Cai
    TI__Genius 11845 points

    Hi Charley,

    Thank you for the insight, this makes sense. When the user checks 0xC4, are they only looking at bit 5 to see if it is a value of 1 for LOCK or a value of 0 for loss of LOCK?

    Also, is there any value of using the INTB pin or REM_INTB pin to show loss of lock reported from the 948? Or is that just redundant of using the INTB pin for the 947 registers?

    Thank you,

    Jared

  • 0 in reply to Jared Becker
    TI__Genius 12866 points

    Hi Jared,

    Yes, they can look at bit 5 only.

    The INTB_IN on 948 doesn't directly report lock loss, if customer were to use this, they need to have a external connection. For example, tie lock pin output to INTB_iN.

    Best Regards,

    Charley Cai