hi alan,
are you referring to the large current jump that occurs
just after downloading the FGPA? i think an unprogrammed
ibob pulls about 1 amp, and a fully programmed ibob running at
200 MHz pulls about 6 amps.
best wishes,
dan
Henry Chen wrote:
Hi Alan,
Sorry for taking a while to respond. In the future I highly recommend that
you email all questions to [email protected]. This will not only
help you access a wider pool of resources, but also helps everybody else in
case they run into the same problem down the line.
I don't think I've ever heard of the current consumption spiking by several
amps. What kind of timescale does that occur on?
As far as the FPGA power-on global reset goes, I don't know of a way to
hold
it off, but there may be a bitgen parameter. Are you getting switching
noise
as you're programming the FPGA?
Thanks,
Henry
Alan Hinton wrote:
Hi Henry,
Hope all is well. Hopefully a quick question. We have noticed that
once in awhile the iBOB FPGA does not get loaded correctly. I believe
that we have narrowed it down to the power supply voltage dipping as
the supply voltage rises which causes the FPGA load to be disrupted.
While tracking this down I have noticed that there are current surges
as the board is running (several amps). Have you noticed or heard
anything like this? Also is there a way to hold off the reset signal
(delay it longer)?
Thanks
Alan
Haystack
