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SN65DSI86: DSI86 minimum switch time for changing the refresh rate

Peter Wei
Expert 3380 points
Part Number: SN65DSI86


Hi Team,

The customer is using DSI86, and the screen resolution is 2560x1440. For diff application, they like to switch the refresh rate of the screen between 60Hz and 90Hz. But they want to switch it very fast, hoping the user can not see the dark screen. So they are asking what is the fast operation of the refresh rate update, and how fast could it be?

Best Regards,

Peter Wei

  

  • 0
    TI__Guru**** 182151 points

    Peter

    Unfortunately, we do not have a source in the lab that can support and test this feature on the SN65DSI86. One option is to order the SN65DSI86 EVM and test it out. 

    When the source switching between 60Hz and 90Hz, how does the source support this feature?

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    TI__Expert 3380 points

    The customer is using some application process, maybe Qualcomm. The host can switch the rate directly, they said if they are using the mipi screen, the host can support some function called flashless switching.

    Is it possible to assume the host can switch the rate between frame, and as soon as it switch the frame, they can configure our device. Could you suggest the script for update our part’s configurations?

  • 0 in reply to Peter Wei
    TI__Guru**** 182151 points

    Peter

    The DSI specification timing events can be provided in one of two types: Sync Pulses and Sync Events.

    For the Sync Pulse type of timing event, the GPU will send VSYNC START (VSS), VSYNC END (VSE), HSYNC START (HSS), and HSYNC END (HSE) packets.

    For Sync Event type, the GPU will only send the sync start packets (VSS and HSS).

    For both types of timing events, the DSIx6 will use the values programmed into the Video Registers to determine the sync end events (VSE and HSE).

    So you can change between the resolutions by changing the SYNC START packet value in the DSI86 video registers.

    I would recommend ordering the DSI86 EVM and test this out.

    Thanks

    David