I have a PROM (XC18V02) set up on my Spartan IIE evaluation board. I'm developing under Xilinx ISE 5. I'm wondering what would be the simplest JTAG cable I could build (or buy if real cheap) to download my code in the PROM. Is any JTAG cable supposed to do the job? The fact is I already a very simple JTAG interface (with a 74HC244 buffer for parallel port)...I tried it but it didn't work.