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DS90UB971-Q1: Map the GPO2 state of the serializer TI971 to the deserializer TI9702

hongli Liu
Prodigy 60 points
Part Number: DS90UB971-Q1

Tool/software:

Hi ,

We use GPIO2 of TI971 as an input. How can we map its status to the GPIO of the deserializer TI9702 and test the output status on the GPIO of the deserializer?

Thanks!

  • 0
    TI__Guru** 107970 points

    Hello Hongli Liu,

    Here are the required settings for enabling the SER GPIO2 as input and the DES GPIO2 as an output:


    Write SER reg 0x0E[2] = 1 and [6] = 0
    Write SER reg 0x33[1:0] = 01
                                                
    Write DES reg 0x12 = 0x21 (enable GPIO2 as output for data received over RX Port0. If the data is received over RX Port1 then the value is 0x15)
    Write DES reg 0x0F[2] = 0

  • 0 in reply to Hamzeh Jaradat
    Prodigy 60 points

    According to this operation, we can see that 0XE of DES moves between 0 and 1. However, on the serializer side, the actual state of GPIO2 is 1.

  • 0 in reply to hongli Liu
    Prodigy 60 points

    And on the deserializer side,we test the  state of GPIO2 is 0.

  • 0 in reply to hongli Liu
    TI__Guru** 107970 points

    Hi Hongli,

    You need to be careful what you write in other register bits. These details are listed on the datasheet.

    Please have understanding that this is a public forum, hence I can't share any details about these devices since these are NDA restricted.
    If you need further support, please contact your local TI representative.