I apologize in advance. I know this is slightly offtopic here, but I think this mailing list is the closest I could get to finding someone who can answer this:
I'm looking for a schematic drawing showing how to build an IDE interface for the MPC823. I have an existing board I want to hack an IDE interface to.
I've been seaqrching the net for boards that contains an MPC823 with an IDE interface, but I couldn't come up with either an appnote, or an existing schematic. (I found a block diagram of the terrapin mine, but it wasn't a full schematic, and anyhow the IDE interface is implemented there using an FPGA).
I understand I must buffer the data bus (what type of 74xxx245 can I use? HC? HCT? something else? IIRC the IDE bus works on +5V, while the MPC823 works on 3.3V.
The PIO part seems relatively easy (I either sacrifice 2 chip selects or generate them from 1 CS using discrete gates I guess). What about DMA?
thanks, Udi