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AM1806 – LCD + SDRAM on EMIFA

BillyO
Genius 17555 points
Other Parts Discussed in Thread: AM1806

Hi team,

 

I am looking for confirmation for a customer question on the AM1806:

 

"

We use a parallel interface LCD (with built in controller) and execute code out of SDRAM.  Can I place both of these devices on the EMIFA data bus?

"

 

I looked around and understand you can have up to 2 devices off EMIFA, I just don’t know if the LCD can only access SDRAM off the EMIFB, or if there are any other restrictions that would make this an issue.

 

Thanks!

Billy

 

  • 0
    TI__Expert 7470 points

    Billy,

    I suppose the LCD is accessed as an ASYNC device. This seems doable as different chip selects will be used by the system to access the two devices. Data transfer from SDRAM to LCD will take place via EDMA. But this is not something we have tried. I will not recommend this as device performance may be severly affected with device trying to fetch code from SDRAM while EMIF is busy transferring data to LCD with data also on the same SDRAM. But in the end if customer's end-application can be tolerate this performance hit, it should be fine.

    Regards,

    Sunil Kamath

  • 0 in reply to Sunil Kamath
    TI__Genius 17555 points

    Thank you very much for the thorough response on this Sunil.

     

    Billy