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From: Alex Freed on 8 Sep 2009 17:06
Serkan wrote:
>
>> I don't understand what you want to say with the last sentence.
>
>
> Even though I cant program the fpga most of the times, I found a weird
> solution to program it sometimes. It is like this:
> I just unplug Xilinx platform cable USB II from my computer and and
> plug to another usb port, (after 10 tries it works)
> I cant understand the reason behind this.
>

I had a similar problem when another USB device also using an FTDI chip
was connected. Do you have say a USB to serial cable? Unplug it. If it
helps get a new one using a different chip.


-Alex.

From: doug on 8 Sep 2009 19:49


Uwe Bonnes wrote:

> Serkan <oktem(a)su.sabanciuniv.edu> wrote:
> ...
>
>
>>I have tested the adapter it programs the other boards.
>
>
>>What I cant understand is what happens when I unplug the board or
>>adapter from my computer and plug again? how can it start to work/
>>program again what is it got to with the chain?
>
>
> I don't understand what you want to say with the last sentence.
>
> But broken hardware, e.g. a JTAG Pin not soldered right can give a lott of
> problems, especially work from time to time and don't work else...
>
I have seen issues where the cable acted like it locked up and had
to be removed and reinserted before it was useable. This has happened
with both the parallel and usb cables. Not having the power on in
the target will also generate the multiple devices found message at
times.
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