Master transmits on mosi.  You have multiple slaves.  The master sends a bit and receives a bit from a slave on each of the 8 (or 16) clock pulses.

So how do you propose to prevent more than one slave from responding to the master's clock?

By the way, if the chips have no chip-select line (per your definition), to where do you expect to connect the multiplexer chip?

-----Original Message-----
From: D. Jay Newman [mailto:jay@SPRUCEGROVE.COM]
Sent: Wednesday, March 17, 2004 11:54 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [ee]: Multiple SPI slaves *without* chip select lines?

Hi:

I have a problem where I would like to interface four chips with an
spi-like interface. These chips have no chip-select line.

Is there some sort of mutiplexer chip that I can use to choose which
slave chip I want to send the data/clock signals to?
--
D. Jay Newman           !
jay@sprucegrove.com     ! Xander: Giles, don't make cave-slayer unhappy.
http://enerd.ws/robots/ !

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