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I solved a similar problem by using FIFO memory. The FIFO memory
occupies one one io address. Write your data block to the FIFO then the
PIC can read the data block at its own pace. Status data can be either a
simple register or another FIFO for read back.

Donald L Burdette wrote:
>
> Hi all.
>
> I want to put a PIC as a peripheral on the ISA bus, which is controlled
> by a PC104 embedded computer running some version of DOS (don't know
> whose, but probably not MS).  The PIC would be an IO device, mapped as
> 256 bytes of IO space.  The problem is that the PIC isn't fast enough to
> watch the address select line (decoded externally), read the 8-bit
> address, look up a data value, and put it on the data bus before the ISA
> needs it.
>
> I've thought about using a simple flip-flop to activate the /IOWAIT line,
> but there's a limit as to how long you're allowed to hold that line.
> It's two microseconds, and I don't think that's long enough.  Is there
> any problem holding this line longer?  I think I would need less than 10
> uS, maybe more like 4 or 5.
>
> Has anyone had any experience in this area?  Any advice?  Good place to
> look for working circuits?
>

Nino.
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| Antonio (Nino) L. Benci                            |
| Professional Officer / Electronic Services Manager |
| School of Physics & Materials Engineering          |
| Monash University                                  |
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| M: 0414 924 833                                    |
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