[En-Nut-Discussion] Major memory mapping changes?

[Radek Podgorny]

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Harald,

I thought the address and data bus is connected directly to the MCU. So
there is a latch somewhere in between operating at 3.3V? If you're talking
about the CPLD itself, the 3.3V level it outputs shouldn't matter as long
as the levels on the "main" bus (the one connected directly to the MCU and
the pins) is 5V. Maybe I just got it all wrong...

Radek


> Radek,
>
> one difference between Ethernut 1 and 2 is the
> voltage level. Ethernut 1 uses a 5V 74HC to latch
> the upper address bits while Ethernut 2 uses the
> 3.3V CPLD.
>
> I'm sorry about publishing the wrong PDF. The given
> link does not seem to reflect the actual CPLD contents.
> I'll look into it.
>
> Harald
>
> _______________________________________________
> En-Nut-Discussion mailing list
> En-Nut-Discussion at egnite.de
> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
>


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