Question: Can SI and SO be shorted on SPI interface to Atmel AT45D081?

Has anyone been crazy enough to connect both SI and SO from the AT45D081 (or
any other SPI device) to the same PIC pin? From reading the data sheet
 http://www.atmel.com/atmel/acrobat/doc0871.pdf ), it appears that SO is
never driven by the slave when the master needs to be driving SI.

Also, how about combining SCK and /CS via a RC delay to derive /CS from SCK?
The problem there seems to be that the waveforms in the data sheet show SCH
staying low when /CS goes high at the end of a sequence if SCH was low when
/CS went low or staying high when /CS goes high if it was high when /CS went
low so a simple RC directly from SCH to /CS is apparently out of the
picture. Or is it ok to raise SCK once more at the end of the sequence to
get /CS back up? Maybe a flip/flop that gets reset when SCH is stable after
changing? Not worth it?

Why can't they just do IIC?
James Newton, webmaster http://get.to/techref
jamesnewton@geocities.com 1-619-652-0593 phone