Hello,
Maybe an ESD event or a short circuit failure causes the board's FPGA's
flash
to loose their program, not nice.
Specificly, I have seen failures where one of the transmitter's push
pull FETS
shorts, takes out their 100 ohm drain resistor - then boards FPGA's
(located on
the opposite end of the PCB) programming mysterious disappears!
Reprogramming
the FPGA's solved the digital problem, not nice! This started to happen
with
a newly introduced brand of FPGA's (byte blaster) programable types,
contact me
offlist for more details.
This type of board transient failure aught to make a nice IEEE paper for
someone. :-)
Regards,
Dave Garnier
David Garnier
e GE Health Care
___________________________________________
David S. Garnier
Senior Technician
Functional & CT Engineering
3000 N. Grandview Ave - M/S W-1250
Waukesha, Wi. 53188
Tel: 262.312.7246
Cel: 414.899.7580
From: [email protected] [mailto:[email protected]] On Behalf Of Moshe
Valdman
Sent: Wednesday, March 15, 2006 11:38 AM
To: '[email protected]'
Subject: Microcontroller memory erased by noise
Hi all,
I have a 8051 compatible microcontroller (Silicon labs) on a board I had
cases at customer sites where the internal RAM and even (more rarely)
internal flash was "erased". Seems like this was caused by noise in
those sites (e.g. other machines switched on\off) Any idea how noise
could be coupled into the microcontroller? How can I minimize such an
effect?
thanks in advance,
Moshe Valdman
Reliability Manager
Orbotech
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