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ARM9 replacing Cortex M3

Michael von Hauff
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    Note: This was originally posted on 7th January 2009 at http://forums.arm.com

    Sim,

    From what I can see from the app notes and data sheet, the DMA transfers a word every 4 cycles (5 according to the HITEX guide). which is 18Mword/s =>36Mbytes/s  at 72MHz

    Unfortunately that is not quite enough. I am outputing to two external highspeed 8bit DACs at min of 36Mbytes/per dac. So even if I interleave the data I will still only be sending to the DACs at 18Mbytes/s per DAC.

    Please tell me if I am wrong about the DMA speed! If so I will get going with trying out the cortex m3!

    thanks,

    Mike.
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  • 0
    Note: This was originally posted on 7th January 2009 at http://forums.arm.com

    Sim,

    From what I can see from the app notes and data sheet, the DMA transfers a word every 4 cycles (5 according to the HITEX guide). which is 18Mword/s =>36Mbytes/s  at 72MHz

    Unfortunately that is not quite enough. I am outputing to two external highspeed 8bit DACs at min of 36Mbytes/per dac. So even if I interleave the data I will still only be sending to the DACs at 18Mbytes/s per DAC.

    Please tell me if I am wrong about the DMA speed! If so I will get going with trying out the cortex m3!

    thanks,

    Mike.
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