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DS90UB926Q-Q1: Can bandwidth of DS90UB926Q-Q1 support 1920*720 Panel?

TZU YANG LIN
Prodigy 30 points
Part Number: DS90UB926Q-Q1
Other Parts Discussed in Thread: DS90UH941AS-Q1, , DS90UB948-Q1

Dear TI Engineers,

Our video structure is DS90UH941AS-Q1 pair with DS90UB926Q-Q1. Our panel spec would be 1920*720. (Two Port)

According to panel spec, the DCLK frequency is under 85Mhz. Can bandwidth of UB926 support 1920*270 panel?  

Please help to confirm. Thank you.

  • 0
    TI__Guru** 103215 points

    Hello, 

    What is shown in the above panel spec is the DCLK frequency for one of the two OLDI port interfaces to the panel, so it is only half of the equivalent total horizontal panel timing. Also this panel spec appears to be for an OLDI type panel, not parallel RGB. So the total DCLK rate is 45.21*2 = 90.42MHz and you would need to use DS90UB948-Q1 instead of DS90UB926-Q1 to get dual OLDI interface. 

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    Prodigy 30 points

    Hi Casey,

    The next stage of DS90UB926-Q1 is Video processor. It can output dual LVDS to our Panel.

    As you said, the DCLK rate of this 1920*720 panel is 90.42MHz, so the bandwidth of DS90UB926-Q1 is not enough. Is my understanding is correct? Could you recommend higher bandwidth of Deserializer? (FPD-link to RGB888 and bandwidth is higher than 85MHz) Thank you.

  • 0 in reply to TZU YANG LIN
    TI__Guru 66840 points

    Hello, 

    DS90UB926-Q1 is not enough bandwidth for this pixel clock/DCLK rate. 

    TZU YANG LIN said:
    Could you recommend higher bandwidth of Deserializer? (FPD-link to RGB888 and bandwidth is higher than 85MHz)

    As Casey mentioned, DS90UB948-Q1 can support this video bandwidth, however it has a output interface of OLDI instead of RGB. So the panel input will need to support OLDI instead of RGB. 

    Regards 

    Logan

  • 0 in reply to Logan Cummins
    Prodigy 30 points

    Hi

    Can DS90UB948-Q1 support video bandwidth up to 99MHz for single channel? CPU standard output video bandwidth is 99MHz for 1920*720 resolution. (2200*750*60Hz) Thank you.

  • 0 in reply to TZU YANG LIN
    TI__Guru 66840 points

    Hello,

    For 99MHz, two channels will be required (dual lane FPD and dual OLDI).

    Regards,

    Logan