[En-Nut-Discussion] Ethernut 1.3H External RAM problem

Ayman Hendawy ayman.hendawy at gmail.com
Tue Dec 18 07:09:55 CET 2012


I don't have Oscillisope or logic analyzer I will try to find one, for the
wait state, I think the SRE bit of MCUCR has to be set, also for the SRL,
SWn0, SWn1 bits of XMCRA according to nutinint.c has not to be zero,
however when I read the MCUCR & XMCRA registers I get Zero for both
registers, what does it mean?


On Mon, Dec 17, 2012 at 1:18 PM, Uwe Bonnes <
bon at elektron.ikp.physik.tu-darmstadt.de> wrote:

> >>>>> "Ayman" == Ayman Hendawy <ayman.hendawy at gmail.com> writes:
>     Ayman> Hi, I have post this problem before but I didn't fix it yet,
> here
>     Ayman> is the update,
>     Ayman> Recently I repalced the SRAM K6X0808C1D-BF55, with
>     Ayman> K6X0808C1D-BF70, but it doesn't work, I don't know what I have
> to
>     Ayman> do to test it, what I have to check, I tried the SRAM test of
>     Ayman> Basemon, it give me an error message"No RAM at 0x8000", I read
>     Ayman> the MCUCR, & XMCRA registers, it was zero both of them, what
> dose
>     Ayman> it mean?
> Did you look with a scope or logic analyzer at the signals on the RAM? Do
> you need more wait-state because of the longer access time (55 ns versus 70
> ns)?
> Bye
> --
> Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de
> Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
> --------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion

Best regards

Ayman Hendawy
Embedded system engineer


Phone: +20110406659

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