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Dual SPI

 
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Ray



Joined: 22 Jul 2007
Posts: 12
Location: Australia

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Dual SPI
PostPosted: Wed Feb 29, 2012 6:17 am     Reply with quote
Hi,
I've noticed that a few flash chips e.g. W25Q16BVSSIG, M25PX16-VMN6TP now run 2 and even dual X 2 SPI's via doubling up the pin directions e.g. making SDI and SDO bidirectional unstead of unidirectional. has anyone out there had experience with this on a microchip or have any thoughts about its feasability?

Cheers
temtronic



Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario

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PostPosted: Wed Feb 29, 2012 8:21 am     Reply with quote
Well..if everything else is constant(ie: clocking speed), you've cut the overall data rate in HALF !!

'Normal ' SPI allows for simultaneous data transfer to and from the peripheral,giving very,very fast performance. If you go 'halfduplex', the micro has to send data,then reconfigure to receive, wait for data,then do 'something' then reset to transmit.....
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