DSPRelated.com
Forums
   Forums    More Forums    c6x  

PCI2040 with C6711B generates NMI

Started by andrew_elder ●September 15, 2005
All,

Has anyone else seen problems with a PCI2040 slave mode PCI interface
and a C6711B generating NMI Memory Parity Errors in a PC ?

This combination worked fine on older PCs, but now we are starting to
see PC crashes.

The other strange piece of information is that a new revision of the
same hardware that uses the C6713 does not have the problem.

- Andrew E.


Reply by Mike Dunn ●September 15, 20052005-09-15
Hello Andrew,
 
I am not sure exactly how your PCI2040 and C6711B are connected [I suspect that the C6711B may be directly involved with writes to host memory], but i have a guesstimation as to the problem.
 
In the beginning [when things worked on PCs], there was a marginal timing problem when the PCI card was writing to PC memory.  The newer PCI controller chips [host] went to a smaller geometry and got a bit faster - this exposed the timing problem even more and caused one or more data bits to miss their hold time.  Then the 6713 came along in a newer, smaller, faster process and "made up the difference".
 
Just a theory...  most likely even the 'working combinations' are operating out of spec.
 
mikedunn

andrew_elder <a...@bigfoot.com> wrote:
All,

Has anyone else seen problems with a PCI2040 slave mode PCI interface
and a C6711B generating NMI Memory Parity Errors in a PC ?

This combination worked fine on older PCs, but now we are starting to
see PC crashes.

The other strange piece of information is that a new revision of the
same hardware that uses the C6713 does not have the problem.

- Andrew E.
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/c6x/

<*> To unsubscribe from this group, send an email to:
c...@yahoogroups.com

<*