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DS90UB941AS-Q1: Vertical jitter are observed, when using DS90ub941as-q1 to drive the ds90ub948-q1.

Marsh Cai
Expert 4225 points
Part Number: DS90UB941AS-Q1
Other Parts Discussed in Thread: DS90UB948-Q1,

Hi experts,

My customer observed the some abnormal phenomenon. Can you help to explain and solve?

Background of the project: Use Tester to light the Screen with ds90ub948-q1 in it. .

1: Use interface 1 with V to drive the screen, vertical jitter was observed. (MIPI)

2, Use interface 2 with DS90ub947as-q1 to drive the screen, normal. (LVDS)

Register Configuration are attached.

1, DS90ub941as-q1

2, Timming

3, Screen Spec

Tks & BRs

Marsh

  • 0
    TI__Guru 66810 points

    Hi Marsh, 

    This might have to do with the DSI packet / settings on 941 if 947 is outputting properly.

    Do you have access to a DSI packet analyzer? If not, do you probing access to GPIO pins? We have a debug mode that can map the VS/HS signals to GPIOs to check to make sure there isn't any glitches in timing parameters, etc. 

    Regards, 

    Logan