Re: SPI slave select signals
- From: Al Clark <dsp@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 30 May 2005 17:34:38 GMT
praveen.kantharajapura@xxxxxxxxx wrote in news:1117455841.370215.303660
@f14g2000cwb.googlegroups.com:
> Hi all,
>
> In an SPI interface i have got 4 slaves and one master
> What i wanted to know is wether the master can assert two slave
> selects(SS_N) simultaneously OR is there a restriction that master can
> assert only one slave select.
>
> Does SPI standard dictate anything!!!
>
> Any comments on this would be appreciated.
>
> Regards,
> Praveen
>
The SPI can certainly assert multiple slave selects. The restriction is on
the slaves. No more than one slave can drive the MISO line at the same
time.
There are many SPI slave devices that are write only (No MISO connection).
Example:
1. Configuring multiple data converters with the same instructions. You
might reset the parts with the same instruction and address the parts
independently for gain settings.
--
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com
.
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- From: praveen . kantharajapura
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