On Mon, 31 Oct 2005, marcel@carrietech.com wrote:

> How about a CPLD-based custom MMU that interfaces between the ISA bus, your
> memory and a VS1001/VS1011? you could memory-map all the configuration
> registers of the MP3 chip and convert the incoming data in that region to SPI
> on the fly. The VS1001 asserts a pin when it needs data so you can just listen
> to that and bit-bang serial data to it when necessary. That chip also has a
> built-in op-amp, so your circuit could be fairly simple.
> - Marcel
>

That's precisely what I have in mind. The audio output would be connected 
to the soundcard, the same way as CD-drives.
To further minimise the workload of the CPU, I would add some RAM on the 
card, and I could even have a IR remote control with a keypad, LCD, etc...

It seems like  very do-able project, but I was hoping someone had already
done something along these lines, on which I could inspire myself.

I'll probably do it eventually, it's just a matter of time... but for
now I'm pretty busy with other stuff. Perhaps I could eventually submit
it to the board-making contest!

Hmm.. it looks like my electronics tinkering time is now 100% booked for 
the next year at least...


Christian
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