This is a custom made LPT JTAG Cable that is designed direct from the official Xilinx schematics (not the cheap design that is going around - this is the higher spec design from Xilinx) Fully compatible with iMPACT software and tested 100% with various Xilinx products that have a JTAG port including the Xecuter CoolRunner. Comes complete with an Xecuter CK3 custom power cable for the Xecuter CoolRunner while updating over LPT.