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DS90UB936-Q1: GPIO input / output when connected to DS90UB913

Shuji Ishiwata
Mastermind 8420 points

Part Number: DS90UB936-Q1

Hi all,

I have a question about connecting DS90UB913 and DS90UB936-Q1.

Input signal to GPIO of UB936. No signal is output from GPIO of UB913.
Do you know the reason for not outputting?
The register setting of UB913 is 0x0D = 55h (default).
The register setting of UB936 is 0x0F = 7Fh (default), 0x11 = 00h (default).

I have something to caring about.
UB913 has 4 GPIOs. UB936 has 6 GPIOs.
I think the number of input and output GPIOs is different.

Please give me some advice.


Best Regards,
Ishiwata

  • 0
    TI__Expert 3390 points

    Hi Shuji,

    What is the value of registers 0x04, 0x1f, 0x35, 0x4c, 0x4d, 0x4e, 0x58, 0x6d, 0x7d on the ds90UB936.

    Regards,
    Mandeep Singh

  • 0 in reply to Mandeep S
    Mastermind 8420 points

    Hi Mandeep　

    Thank you for contacting me.
    I check the contents of the register with the customer.

    I noticed. The DS90UB936-Q1 data sheet has the following contents.
    7.4.13.3 There was a description in Forward Channel GPIO.
    Is remote GPIO control possible when UB913 and UB936 are connected?

    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Expert 3390 points

    Hi Ishiwata,

    Yes, that shouldn't be an issue. Please let me know once you have those register values, so we can diagnose what's going on with the boards.

    Regards,

    Mandeep Singh

  • 0 in reply to Mandeep S
    Mastermind 8420 points


    Hi Mandeep　


    Indicates the contents of the customer's UB936 register.

    0x04=0xC3(def)
    0x1f=0x02(def)
    0x35=0x00(def)
    0x4c=0x01
    0x4d=0x00(def)
    0x4e=0x00(def)
    0x58=0x58
    0x6d=7F
    0x7d=0x00(def)


    I noticed that we must select GPIO of UB936 with 0x6E.
    I advised the customer to set 0x6E.


    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Expert 3390 points

    Hi Ishiwata,

    Looks like you don't have LOCK, which means there's no link/communication between the two parts. Before you even go into GPIOs, you need to first establish a stable LOCK between the two parts. The Back channel speed on the 936 is correct and the MODE is set-up for RAW10. On the 913, is the mode RAW10? Are you able to talk to the 913 by itself? Can you get a register dump of the 913 registers, so we can confirm it's operating. What mode is the 913a MODE, External OSC or PCLK from Imager?

    Regards,
    Mandeep Singh

  • 0 in reply to Mandeep S
    TI__Expert 3390 points

    Also, what is the value of REFCLK that is going into the 954 REFCLK pin 5? Can they please measure/ensure that this working properly.

  • 0 in reply to Mandeep S
    Mastermind 8420 points

    Hi Mandeep　

    Sorry to bother you.Thank you for your support.
    The link of UB913-UB936 has already been established.
    RAW data is output normally in MIPI.
    Customer contacted me.
    By setting 0x6E in the register, GPIO input to UB936 output to GPIO of UB913.

    Best Regards,
    Ishiwata