Is there any way to disable JTAG for Sptantan3AN

On Mar 4, 4:47 am, Martin Thompson <martin.j.thomp...@trw.com> wrote:
> Antti <Antti.Luk...@googlemail.com> writes:
> > 3) Lattice ECP2 have non-volatile AES key, making them best candidate
> > if design security/theft is of concern, also the design migration from
> > Xilinx to Lattice is much much more easier then Xilinx to Actel
>
> If it's non-volatile, is it not "relatively easy" to extract the key
> from the chip by invasive methods?  I say "relatively", compared to
> the volatile keys in a virtex device - still not a trivial task :-)
>
> Cheers,
> Martin
>
> --
> martin.j.thomp...@trw.com
> TRW Conekt - Consultancy in Engineering, Knowledge and Technologyhttp://www.conekt.net/electronics.html

I don't think design security is the issue if the OP's
original system had an external PROM, whether or not it
was re-programmable.  Preventing inadvertent re-programming
can be accomplished at the board level as noted, but if
the device is delivered as a chip it is not as simple.
I've seen microcontrollers programmed and sold as
application-specific parts.  Often the data sheet for
the programmed part does not make it clear where the
part came from, and the chip is re-marked.  In this
sort of scheme, you could always call out the JTAG
pins as grounds...

What is the actual application?

Regards,
Gabor