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DS90UB953-Q1: DS90UB953-Q1 fowrard ch GPIO setting

Tomohiro Nagasawa58
Expert 1570 points
Part Number: DS90UB953-Q1

Dear support team

I want to select output the GPIO2 of UB954 from GPIO3 of UB953 using forward ch.

I tried setting the register as follows but it is not output.
Could you tell me the correct setting?
<954 setting>

0x4C, 0x01' ;port0_enable

0x0F, 0x00' ;GPIO1-06_INPUT_EN_disabled

0x59, 0x01' ;One GPIO

0x11, 0x61' ;GPIO1 from RX Port 0 SerializerGPIO03-output_enabled

<953 setting>

0x0E,0x4B

0x33,0x05

Regards

Tomohiro Nagasawa

  • 0
    TI__Guru** 108390 points
    Hello,

    did I understood you correct that you want the 953 GPIO3 as Input and the 954 GPIO2 as output? If yes, use the following settings:
    953:
    0x0E= 0x08
    0x33 = 0x05

    954:
    0x12 = 0x61
    0x0F = 0x00
    0x59 = 0x01
  • 0 in reply to Hamzeh Jaradat
    Expert 1570 points

    Hello Hamzeh-san

    Thank you for quick response.

    Sorry , I took mistake.

    I want 953 GPIO3 as input  954 GPIO1 as output.

    And about 953 side, I would like to use GPIO0 and GPIO1 as input and GPIO2 as output, not as forward channel.

    In that case, is it necessary to change the register other than 0x0E(GPIO_INPUT_CTRL) = 0x4B?

    Regards

    Tomohiro Nagasawa

  • 0 in reply to Tomohiro Nagasawa58
    TI__Guru** 108390 points
    Hello Tomohiro-san,

    you said you want 953 GPIO0 & 1 as inputs. What and where should be the output?
    also you said GPIO2 as output. What it shall output? Local signal? fixed 0 or 1? or Back channel GPIO and the input is on the Deserializer side?
  • 0 in reply to Hamzeh Jaradat
    Expert 1570 points

    Hello Hamzeh-san

    Sorry for lack of explanation. My setting is as follows.

    By setting the forward channel of the 0x33 register to 0x07, this issue was solved.

    GPIO3 does not seem to be transferred on the forward channel., unless set FC_GPIO_EN to "Four GPIOs".

    <953 side>
    　　GPIO0:input
         GPIO1:input
         GPIO2:output
         GPIO3:input (forward ch GPIO setting)

    <954 side>
        GPIO1:output source linked to GPIO3 of 953

    Regards

    Tomohiro Nagasawa