[sdiy] SPI comms - how fast is reasonable?

[Neil Johnson]

Hi,

Eric Brombaugh wrote:
> I've had pretty good luck with SPI clock rates in the 1-5MHz range  
> on perfboard with no special attention to lead dress.

Exactly - its all to do with the physical layout of the tracks,  
termination on long lines, etc

> On PC boards it's fairly easy to get SPI working up to the maximum  
> specified rates for the components - typically in the 50-60MHz  
> range. I've got a SPI flash talking to an FPGA at 25 MHz on my  
> latest project with no trouble at all.

Latest SPI technology in handsets goes up to 104MHz.

Neil
--
http://www.njohnson.co.uk