On Mon, 2004-07-05 at 15:00, David Meggy wrote:
> Most importantly is the fact that there seem to be problems with both
> the 9603 and 9604 chips. If you look in the data sheet section 7.2.17
> RXS0, you can get a quick description of how setup packets work. The
> chip behaves this way almost always, but on rare occasions, that is
> sometimes very hard to trigger and other times is triggered in only a
> few minutes, the 2nd read of this register will show a setup packet with
> 0 bytes. According to my analyzer the 8 bytes were transmitted and the
One other thing I forgot to mention. I actually got some support from
National. Lowering the resistance on the series resistors across the
data lines drastically lowered the occurrence the bug. They claimed to
have an errata document for this, but I couldn't find it. We now use 22
Ohm resistors.
David
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