Hi Inge!
Send the board to a logic specialist!
It sounds like the part isn't configuring. Debugging that usually
requires no more than an oscilloscope, except that it depends on whether
the board designer left access to the important pins. I don't have the
data sheet in front of me right now, but some of the key pins for
configuration include: Two "Mode" pins, which control how the device
configures (slave, where someone else provides the clock; master, where
the Xilinx provides the clock; serial data configuration mode; or
parallel configuration mode); CCLK, which stands for "configuration
clock"; INIT, which can hold off configuration; and DONE, which tells
you whether the device thinks it configured. Also, there is the serial
data line (or parallel data bus for the parallel configuration) which
carries the configuration from the flash to the part. The first thing
to do is to get an oscilloscope on CCLK. If none comes up when the
power is first applied, then probably INIT or the MODE pins are not in
the right state. If there is no movement on the DATA line(s) going from
the flash to the 4013, then maybe someone forgot to program the FLASH.
INIT is mostly an input which causes re-configuration, but if you review
the data sheet for the part, you will also see that INIT is also an
output indicator that something is wrong with the configuration bit
stream.
As I said, as long as you can get to the signals, you can figure this
out. Even if its a BGA, the ones made at that time had lines running to
the edge of the part which were for "bussing" for gold plating the
wirebond pads.
Good Luck,
Wayne Thayer
>>> [log in to unmask] >>>
Hi all,
TechNet member's knowhow got no limits, so I try this, despite not usual
PWB topic. Have some FPGAs for DSP that don't work at all. CLK A and B
are OK, checked with a scope on the inputs, all 5V Vcc's are OK, but
when I apply stimuli on the various inputs, I get no reaction on any
data outputs. Very primitive test method, I know, but I thought that at
least something would come out to show that the device isn't completly
dead. The flash memory is external, I've tried with both disabled and
enabled flash, nothing helps. I can't remove the FPGAs, so I have to
test them on the assembled board. I've tried various triggers too. An
advanced troubleshooting would include logic analysers, external pattern
generators and a special test adapter. That's for a logic specalist,
which I'm not. My question is this: Does anyone of you have a proposal
how to test, simple way, if the FPGAs are dead or alive? The FPGAs are
Xilinx 4013, made in numbers of 'millions', very popular some years ago.
A fresh board costs 30,000 USD, hoped to escape that cost.
Inge
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