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Original question:

DS90UB954-Q1: Configuration for External FrameSync With Two DS90UB954 Deserializers

DS90UB954-Q1: Configuration for External FrameSync With Two DS90UB954 Deserializers

user4838523
Prodigy 30 points
Part Number: DS90UB954-Q1


Hi brother：

    

         The picture above is my hardware block diagram，but Each 954 carries two 953。The EXternal FS enter from GPIO 0，I want FS output from GPIO 2 of every 953 .The frequency is  just 25Hz to do frame synchronization.

         I config the registers according the datasheet like the picture

 my config: 0X18:0X08 

                 0X6F:0X8A

                 0X10:0X91     but  the GPIO 2 of 953 is just low level.All other functions are normal.Four-way video are normal. please give me some help thankyou.

  • 0
    TI__Mastermind 30515 points

    Hi,

    yes, to enable the external frame sync., you just need follow up the design request as shown by you.

    for reg. 0x18, pls check the d/s carefully, you need set 0x18 = 0x81 to select the frame sync. signal from GPIO0 port.

    for reg. 0x6F, it is right. but you need select the port in reg. 0x4c before you want to link it to port0 or port1.

    reg. 0x10 is not used here, the GPIO0 in 954 side must be used as input this is default setting in reg. 0x0F.

    rgds,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 30 points

    Hi Steven:

      I config as you suggested.But it still doesn't work.The GPIO 2 of 953 is always low level.And I config it internal FS mode according datasheet. it always doesn't work.

     My internal FS mode config：

    add：0x6F：0x8A      0x10：0x91

    Does 953 need anything configured?

    rgds,

    Qi yuwei 

  • 0 in reply to user4838523
    TI__Mastermind 30515 points

    Yuwei,

    you also need set 953's GPIO as output, the default GPIO of 953 is input. since you need send out the frame signal from 953, so the assigned GPIO of 953 (genearting frame sync. sourced from 954) should be set as input.

    regards,

    Steven