Connecting XJTAG to your circuit

In addition to setting up the pin mapping for your project and configuring any external hardware in your circuit, you should also tell XJTAG how it is connected to the UUT.

Providing this information allows XJTAG to use its connections to the UUT during the connection test and in XJEase testing - any pin that is configured in the pin mapping as a PIO pin is then available to drive the net it is connected to. You do not need to do anything explicit to enable this in your test device files - the system will use the available pins as required.

PIO pins can be used in conjunction with JTAG TAP pins during testing, and can even be used when there are no JTAG devices on the UUT to carry out testing.

If you are using an XJLink or an FTDI USB MPSSE cable, you will need to configure the connections on the Connections screen in XJDeveloper.

Adding connections for the JTAG signals will improve messages that are output by XJTAG during testing. As well as connecting signal pins, make sure you configure (and physically connect) ground pin connections.

If you are using an FTDI device that is mounted on the UUT, simply selecting the correct part number and netlist device when adding the FTDI pin mapping will allow XJTAG to automatically find the available connections.

Connections from External hardware to the UUT are not added on the Connections screen - they are part of the external hardware setup on the Boards screen.