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DS90UB988-Q1: DS90UB688

meng li
Prodigy 20 points
Part Number: DS90UB988-Q1


工程师您好

我现在的配置是加串器983，解串器是688，我想问下，是否可以通过配置688，来开启前向通道（加串器输出到解串器）的FPD-LINK的展频，如果可以，麻烦提供下具体硬件口的配置，或者软件寄存器的具体配置

谢谢~

  • 0
    Prodigy 20 points

    工程师您好，麻烦回复一下呢

  • 0
    TI__Mastermind 40885 points

    您好

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待

  • 0 回复 meng li
    TI__Mastermind 40850 points

    The 98x Script Gen Tool has an option to configure FPD-Link forward channel SSCG. Are you needing to generate a script for a specific configuration? I can generate a script for you if you know the FPD-Link rate (3.375Gbps, 6.75Gbps, etc.).

  • 0 回复 Vivian Gao
    Prodigy 20 points

    Hello Engineer Gao

    Thank you for your reply.


    The question I want to ask is how to configure the spread spectrum of the master device 98390UH983 through the slave device DS90UB688.
    I also have another question: For the 688's spread spectrum frequency, is it better to set it to 5% or 2%?

  • 0 回复 meng li
    TI__Mastermind 40850 points

    To send I2C transactions from DES to the SER, the I2C_PASS-THROUGH bit (UB688 MainPage 0x4[3]) will need to be set. The DES will forward transactions that matches the I2C address found in the UPSTREAM_ID register (UB688 MainPage 0x6)

    It will be the same register writes to the 983 for configuring FPD-Link forward channel SSCG. There are no writes needed to the UB688 for the SSCG function.

    For the OLDI TX SSCG, it is best to start with the lowest spread spectrum frequency deviation. The higher the OLDI TX SSCG the more variation on the output video timings which can potentially cause flickering on the screen depending on the tolerance of the TCON.