Jim,
On Jan 14, 2008 8:16 PM, wrote:
>
> I have run into an issue on one of my boards (custom) where the DM642 will
> assert multiple reads without dropping any of the CEn signals.
>
> This happens when the DSP supposedly reads from CE3. I have tried both a
> mem-copy and EDMA with the same results on this particular board. Other
> boards work fine, but this one does not seem to drop the CEn signal. It
does
> on test code, but not my "full up" code. The CE3 chip select works, as I
> have probed it with an O-scope.
>
> I was wondering if any of you have seen behavior like this, and what could
> be the cause of it?
I have seen similar symptoms with external memory problems. Simple
test cases [run from internal memory] would work fine, but larger
programs [run from external memory] behaved badly when accessing CE2.
I suggest running simple programs from internal memory to attempt to
characterize the behavior. Keep in mind that the symptom that you
are seeing [CEn not working] may not be directly related to the 'real
problem'.
Let us know what you find.
mikedunn
>
> Thanks in advance,
> -Jim
>
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