I agree: pre-scan is the way to go. Document all of the steps so that
you can produce your reasons for your decision if challenged.
On 2024-04-06 00:05, Brent DeWitt wrote:
Tough one! The problem lies in the determination of "worst case".
While it would be easy to presume that having all of the hardware
populated is worst case, it overlooks the effects of un-terminated
stubs and other SI related issues. In addition, with the world of
firmware based PLL clocks and memory traffic, it is a tough thing to
determine. My opinion would be to preform the simplest pre-scan on
each configuration and base the final, rigorous certification based on
that knowledge.
Brent Dewitt
Milford, MA
On 4/5/2024 6:47 PM, Lfresearch wrote:
Hi folks,
I would like to advise a client at where to draw the line on what
needs testing. I would like to solicit opinions besides my own.
Otherwise it’s the fox urging the chicken coop…
So a manufacturer that makes a product of which there will be several
variants. All use the same board, but have different sections of
circuits populated. This may require slightly different code to run
on the same uP in each case.
So.. The burning question is can we perform and analysis that
postulates a worse case hardware/software combination and test just
one configuration? Or, do we have to do every combination?
Or, are there some guidelines about where we draw the line of what to
test and what can be claimed as similarity?
Off list responses are welcome too.
Thanks,
Derek Walton
LFResearch/SSCLabs.
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