JTAG Programmer
The JTAG Programmer is designed for level conversion between the parallel port (LPT) and a JTAG interface. It is fully compatible to the Xilinx parallel cable III, with improved reliabilty, caused by Schmitt Trigger inputs on the LPT side. It features the old Xilinx 9 pin JTAG connector, as well as the new 14 pin header with 2mm pitch. For ease of use with Trenz Electronic FPGA Boards, an additional 10 pin header with 2,54mm pitch is added, which is capable of powering the programmer, even with JTAG voltage levels below 3.3V.
Features
? Level conversion between parallel (LPT) and JTAG port
? Fully compatible with Xilinx parallel cable III
? Adapter can be powered by the target
? Flexible power supply input via JTAG port, or USB
? JTAG voltage level adjustment by reference input voltage
? Improved reliabilty, due to Schmitt Trigger inputs on the LPT side
Details
To locate the connectors on the board see
Figure 2.
JTAG Programmer Location of jumper and connectors
Power Supply
The programmer requires a 3.3V powersupply on the LPT side. There are three options, selectable with Jumpers.
Attention:
Short only one Jumper at the same time.
Powered by target using VREF
If your target board implements a 3.3V JTAG chain, you can power the programmer with the VREF line from any of the JTAG connectors. Set the jumper to VREF.
Powered by target using VCC
If your target supports the pinout of the HDR10 connector, the 3.3V VCC line can be used to power the programmer. Set the jumper to VCC.
External powered via USB
If you have a low voltage (below 3.3V) JTAG chain, and can’t use connector HDR10, you have to supply the programmer externaly. Simply connect an USB cable. Set jumper to USB.
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