[En-Nut-Discussion] xram bus

[Harald Kipp]

Oops, I just recognized, that the PDF of the CPLD
schematics is outdated.

Here we go...

0x0000 - 0x00FF ATmega128 registers (see datasheet)
0x0100 - 0x1100 ATmega128 internal RAM
0x1100 - 0x7FFF Ethernut fixed external RAM
0x8000 - 0xBFFF Ethernut banked RAM window (30 pages 16kB ea.)
0xC000 - 0xC0FF LAN controller
0xC100 - 0xFE00 Not used, available to expansion hardware
0xFF00 - 0xFFFF Banking register

Harald

At 02:28 06.04.2004 +0300, you wrote:
>Hello,
>I have another question about xram bus.
>Can I use upper memory addresses for my own devices?
>I mean does cpld translates atmega ALE signal and sets a0-15 and d0-7 
>correctly when wr/rd active?
>Again, please, point me where can I find full memory map of ethernut2 board?
>I know, that nic uses 0xc000-0xc00e addresses, 0x8000-0xbfff used by 
>bankmem and 0xff00-0xff1e by bank select registers.
>Seems, that 0xc00f-0xfeff,0xff1f-0xffff are free for use.
>Is it all or I missed something?
>
>Thank You.
>
>
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