I mentioned before in my post about the EKK-LM3S811 development board that one of its features is that it can act as a JTAG host to a generic target given the proper software. The easier alternative is to create a clone of the Xilinx parallel download cable. This cable is so basic that it will work with almost any software including jtagtools and most derivatives. Here is the link to the schematics, however, a more detailed description is in the appendix of the Xilinx JTAG programmer guide.

( xilinx-jtag.pdf ) ( adi-jtag-ap.pdf )

 
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