[En-Nut-Discussion] Ethernut 2.0 Alpha Schematic

[Harald Kipp]

Austin,


>         Ok, so here's one more idea:
>
>         1. Leave 0x0000 - 0x7fff for controller
>         2. Make 0x8000 - 0xbfff for decoded devices using 3to8 or 4to16
>decoder
>         3. Make 0xc000 - 0xffff for bank switched memory (~ 16k blocks)

I'd agree with Mikael, changing 2 and 3.


>         Another ugly schematic submitted. :-)

Much more advanced. Looks like you found the function
of the right mouse button while drawing wires. :-)


>         This time by writing to any of 0x8000-0x83ff you would switch the
>16k banks, and any other memory mapped devices would connect off the
>multiplexor. You could attach one or more ethernet devices, plus any other
>devices. 4to16 might be more than you want - it will segment the
>0x8000-0xbfff in 1k blocks. Maybe 3to8 would be better?
>         Are 16k memory banks large enough? I would tend to think they are.

16k memory banks is exactly what I had in mind. But
I have no idea about how to wire the address lines
to the RAM, specially A14. Would you mind adding the
KM684002 form library memory-samsung?

Harald