Re: Problems with Xilinx Parallel III Cable

On Wed, 28 Mar 2007 10:12:15 -0700, jidan1 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 have a simple upgrade to the parallel cable III that has Schmitt
triggers on the clock, and a simple shunt regulator with an LED that
limits internal VCC to about 4V, giving TTL compatible LPT interface even
if used with 5V JTAG.

It works reliably with 2.5V to 5V JTAG chips

I have PCBs which I can send for free as long as its in the USA (1"x1"
card in envelope) Requires SMT assy


Peter Wallace
.

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