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Max DMA transfer speed

Michael von Hauff
Note: This was originally posted on 4th January 2009 at http://forums.arm.com

My application requires that I transfer data from a external device connected via one of the gpio ports. I need to transfer data at about 40MSps. 8 bit samples.

From what I have read about the DMA controller, I can get transfers at 1/4 the clock speed (1/4 of 72MHz). Is that correct? I was think of pulling in two samples at a time (use a 16bit buffer).

Also, if I want to get data from the GPIO port, what would be the dma configuration that most makes sense? My external device is a A/D. I have to clock it somehow. assuming I can use any peripheral to drive the dma which should I use?


Thanks!
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