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A Digilent programming cable (parallel or USB) can be used in place of a Xilinx parallel or USB programming cable in applications where the JTAG logic power supply is in the range of 2.8V-5V.
A [http://joule.bu.edu/~hazen/jtag_test/JTAG_dongle.jpg small adapter] from 0.1" male single row header to 2mm 14 pin ribbon cable connector is needed.
The pinout for the adapter is as follows. Note that there is an alignment key on the 2mm connector... this should be on the side with odd-numbered pins.
Digilent Signal 2mm pin pin 1 TMS 4 2 TDI 10 3 TDO 8 4 TCK 6 5 GND 1,3 6 Vcc 2
For reference, here is the data sheet for the Xilinx Parallel Cable IV.