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Original question:

DS90UB926Q-Q1: the Display has no image

DS90UB941AS-Q1: Want to know how to initialize the dsi receiver when powered on

chen zh
Intellectual 300 points
Part Number: DS90UB941AS-Q1

Hi Teams:

      I met one black issue:
    LP11 is ok, and the registers about DPHY don't report errors, DSI_VC_DTYPE is 0,
   

   two questions:

   1. Dsi receiver initialization must be finished in the host dsi startup P11 stage, or can do it in every P11 stage in host dsi output video data? 

   2. Can 941 power up and initialize before the host DSI initialization, while only focusing on receiver initialization?

  • 0
    TI__Mastermind 29225 points

    Hi Chen,

    chen zh said:
       1. Dsi receiver initialization must be finished in the host dsi startup P11 stage, or can do it in every P11 stage in host dsi output video data? 

    According to DSI v1.3.1 specification, a DSI source is required to periodically enter LP11 (Low Power Mode) on the data lanes (not the clock) at least once per frame.

    Please see DSI bring up guide attached. 

    7624.DSI Bringup Guide.pdf

    chen zh said:
       2. Can 941 power up and initialize before the host DSI initialization, while only focusing on receiver initialization?

    For deterministic start-up please follow datasheet power-up sequence recommendation section "10.2 Power-Up and Initialization" page 148 - DS90UB941AS-Q1

    Regards,
    Fadi A.