Re: Problems with Xilinx Parallel III Cable

On Mar 28, 11:12 am, jid...@xxxxxxxxxxx wrote:
Hi,

To program my Atmel(ATmega128L) controller and Xilinx FPGA (sparta-3
XCS400) at the same time, I decided as a programmer to use the Xilinx
Parallel Cable III. I implemented the programmer 100% the same as
found in Xilinx's website (http://toolbox.xilinx.com/docsan/xilinx4/data/docs/pac/appendixb.html).
The programmer worked, but not without problems. For programming the
Atmel uC I used AVRdude, and for the FPGA, ISE9.1i. The ribbon-cable
from the LPT port to Programmer was 20cm long and from the programmer
to the uC/FPGA board was not more than 10 cm.
The problem related with this programmer were verification errors, i.e
the PC can't program or read properly from the board. The interesting
thing is how these verification problem came up.
In the morning when I turn the PC and Board on, these verification
errors are a lot. When the code that I want to download is big, its
impossible to program the FPGA/uC, for small codes it works but after
many tries. After 10 tries or so, the programming works correct and
no verification errors no matter how many times I try to download the
code or how big the code is, and this without even touching a thing on
the hardware!!!

Since this problem applies to more than one board, I assume the
problem must lay on the programmer itself. My explanation is that
maybe the buffer IC's get hot or something...I really don't know.
I want to know if there is anyone who has had problems with this
programmer cable.

Thank You,
JJ

I'm doing exactly the same, but I'm using the Digilent Parallel JTAG3
cable ($12 http://www.digilentinc.com/Products/Catalog.cfm?Nav1=Products&Nav2=Cables&Cat=Cable)
Impact 6.3 to program my Spartan3-1000, and avrdude to program my
ATmega64.
I had problems in the past when I had some noisy power supplies in the
lab and got mysterious errors, sometimes I had to turn off the noisy
power supply to make my JTAG work :)

Zoltan

.

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