FPGA Central

Anyone experienced a bit error in a configuration PROM? Our design
contains a XC18V02 that configures a XCV300 in master serial mode. The
design has worked flawlessly for many years, but in recent time three
individuals have suddenly stopped configuring on power up. The first
two where considered "accidents" and the PROM were simply reprogrammed,
after which the units (so far) worked flawlessly. When it happened a
third time (three strikes and OUT), it became an issue. Read-back
through JTAG revealed a single bit error in the PROM.

All EEPROMS are from the same batch, marked:

XILINX
XC18V02
VQ44AEN0117
F1178746A
C

Has this happened to anyone else?

Not so long ago (about 3-4 years) I had this problem with the XC18V02
configuring a ( I believe) Spartan target. I had single bit errors,
too.

It seemed to be a batch issue, but it was painful while it lasted.
Fortunately, it occurred on my pre-production units so all the faults
were within our own lab.

Cheers

PeteS

Seems I was a bit quick to post this question, there was a thread about
such an issue some years back (XC18VXX PROM Corruption). It seems
Skyhawk172L (nice plane by the way, me I fly Pipers mostly...) had
identical problems. I also had a '1' flipped to a '0'.

No conclusive answer as to what might be the cause though.