> http://www.mp3ar.com they release a soft IDE interface on a little PIC !
> If they can do it on a PIC it should be easy to do it on uCsimm/68k !
> The only problem is that uCsimm has to few IO to drive IDE (32bits + some
> control lines). You have to use multiplexors/latches with levels convertor
Or you could make an IDE controller using a PIC with a PSP, and interface
the PIC to the uCsimm using the PSP port. We've taken a PIC with I2C bus
controller firmware and interfaced it to a uCsimm via the PIC's PSP port.
Works nicely. We used 74LCX series chips to do the level conversion.
We used a 16F877 for the PIC ($6 from Arrow in small quantities [4 or
more]). We used a 74LCX245, a 74LCX08, and a 74LCX04 for voltage shifting
and address decoding (we had another device connected to the bus off the
uCsimm). I think it was less than a dollar for the 74LCX chips. The
'08 was only needed for the address decoding.
The 74LCX series are only available surface mount. You'll need a 5V
supply for the PIC and a 3.3V for the uCsimm and the LCX chips.
--- Geoffrey Wossum firstname.lastname@example.org Project AKO - http://rover1.uta.edu/~ako Internet Imperialists - http://inetimperial.sourceforge.net This message resent by the email@example.com list server http://www.uClinux.com/
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