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Original question:

DS90UB941AS-Q1: superframe configuration

DS90UB941AS-Q1: Application inquiries

James Zhan
Expert 4365 points
Part Number: DS90UB941AS-Q1
Other Parts Discussed in Thread: DS90UB940N-Q1, DS90UB948-Q1

Hi team,

My customer is using UB941AS in their application and has some question as below.

Could you help to check and see if you have some advice?

Thanks.

1. If they use external reference clock, could port0 and port1 share the same external reference clock?

2. Should they select external reference clock based on PCLK?  For example, if PCLK=1920*720*60=82.94MHz, then they should choose a 82.94MHz oscillator? If they use two port independent mode, should they use two different reference clock to match the PCLK for each port respectively?

3. If they use UB941 for two display, and both of the display have touch. How should we do with the touch interrupt? Should we use one via the REM_INTB, and the other one with GPIO?

4.Is our SPI pass through Full duplex? do we have some production cases?

5. If we only use one DSI input, and connect to two different resolution screen, what kind of Des should we choose? 

  • 0
    TI__Guru** 103215 points

    Hello James,

    1. For which mode? In dual FPD mode or splitter mode, they can share the same REFCLK0. But for independent 2:2 mode there needs to be 2 separate REFCLKS

    2. Yes, correct 

    3. Please see section 10 of this app note: https://www.ti.com/lit/pdf/snla308 

    4. The SPI implementation on the 94x FPD devices is half duplex. The write/read functionality in either forward/reverse control channel direction needs to be half duplex only. We do have several production use cases for SPI across the 94x data path, for example to read back touch data for remote display panels. Note that SPI is only available in dual FPD Link mode, not splitter or independent 2:2 modes since it uses the secondary control channel link for SPI

    5. The DES selection should be based on the desired parallel interface. For example to implement OLDI display interface, you could select DS90UB928-Q1 or DS90UB948-Q1. For RGB interface you could select DS90UB926-Q1, or for CSI-2 interface you could select DS90UB940N-Q1. 

    Best Regards,

    Casey