> Motorola doesn't recommend to destroy the JTAG port by
> high voltage because it adds unpredictable stress to
> die which may cause reliability issue. Here is an
> article from Motorola addressing this issue.
This article does not mention JTAG. I can tell you from hard experience that
"co-device" method is worthless unless the JTAG port is inactive. I would cover
processor in epoxy and take further steps.
In places in Asia, if your product is bringing enough revenue to be copied then
The co-device method does have one advantage, but it's based on understanding
behavior, not technical: if you use a small, unmarked, non-remarkable device,
devise the algorithm so the processor fails (acts weird randomly) very slowly
time, then you have a chance to determine who is copying your product. Why?
the people copying your product don't know what the little weird chip does and
they leave it out the copy still works fine -- maybe even for months. In that
you monitor customers who inquired to you, but found your price too high, and as
courtesy or sales follow-up offer them a free unit should they purchase anyone
'compatible unit' and have trouble with it. In return for that free unit, they
to tell you their supplier. You'll get at least one taker, and there you go.
you do next, I have no comment.
Signalogic > --- brother20010501 <>
> > I am new to DSP56F826. Since it does not have the
> > code-protection
> > function, can I protect the codes in the flash
> > memory by destroying
> > the JTAG port electrically?