I'm a newbee, so please bear with me if this does not make sense.
I got a AVNet (MEMEC) Virtex 4 based developper kit based on the Virtex-4 FX12 Mini Module whoes baseboard JTAG port is documented as "a 2.5V compatible JTAG chain header". The pinout is identical to what Xilinx seems to use (14 pins etc.). The docs seem to asume that one must use the Xilinx parallel cable IV which from what I understand seems to automatically sense the voltage needs of the target and is having other nice to have features. However, due to several reasons which are beond the scope of this post, I can't simply pick up the phone and order one from a supplier last not least also because I don't know any that would carry this item here in Switzerland.
The net seems to be full of homebrew JTAG cable websites giving instructions to build you own. The question is can I use one of those? I'm a bit afraid that this will not work cause from what I understand they seem to be designed for 5V or 5V tolerant devices. What other options do I have? Any links to a schema of the Xilinx paralell cable IV or such to build my own JTAG cable running at 2.5V?
I would also not mind to shell out the needed $$$ to get that original cable if I could easily purchase it somewhere online using paypal or a credit card and get it deliverd quickly. Any ideas?