[En-Nut-Discussion] Ethernut 2.0 Alpha Schematic

[Harald Kipp]

Jarek,


>I've been thinking about something very simple. I want to leave lower space
>for cont memory and a15 for mem /CS, and use something like 3to8 decoder
>with a15 as 'oe' for upper memory space. I need 3 cs lines in upper mem

Not sure wether I got you right: Only
32k SRAM in total, no memory banks?

>range: 1 for asix and 2 for uart and I plan to add compactflash for
>monitoring app so it's leave some free lines for future use. Both asix and
>uart are 3V so if I use HC series chips 3V powered it should work.

Two things:

1. The AX88796 contains its own address decoder.
No need to use a CS.

2. Driving the HC series with 3V degrades their
performance.

Harald