Hi I will play around with XC95xxx and I'm wondering if someone can tell me if the parallel JTAG cable schematic found in the documentation is worth to build ...
I'm also looking for supplier of PLCC to DIP socket adapter, I know Aries makes somes , any others cheap supplier ?
We don't list it yet on the website but we are selling our PROG2 cable, a Parallel Cable III look-alike, for £10(plus VAT if applicable). You can build your own fairly easily so take your choice.
We have some things in the brew with DIP socket but they are on low priority on the roadmap. What exactly are you after?
John Adair Enterpoint Ltd. - Home of Raggedstone1. The Low Cost Spartan3 Development Board.
The parallel cable III has reliability issues that you should fix when building your own.
- The parellel port has TTL outputs. It only guarentees a VOH of 2.4V. Using CMOS buffers with a switching threshold of 2.5V does not make much sense in that case. Instead use a buffer with a switching threshold between 0.8V and 2V. (For example CMOS buffers powered by 3.3V or skewed buffers.)
- The parallel port output can have a very slow rise time with a lot of noise. Connecting that to a fast buffer can create additional edges on the signals. You should have a significant hysteresis on the CCLK signal. You can do that by feeding the output of the CCLK buffer back to its input with a voltage divider.
The price is for the cable is good, but they will charge me $18us to send it in Quebec Canada. They used at it seems Global Express Mail and UPS ( it's a no go for UPS, they usually charge you $50 for every thing passing the border...).
Weather forecast for the week seem not good I'll maybe build a proto for the xilinx free cable .
Yes that what I'm gonna do. Thanks for your info :-)
We have produced a special version of our programming cable that has a narrow head called PROG2N. It is a Parallel III cable that has a 14 Pin IDC narrow end that fits most 14pin 2mm headers, the price of this is £10 and shipping is dependent on how quickly you want the cable.
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