Power, Pin mapping and Test Reset Sequence options

This page of the wizard configures the JTAG interface of your XJLink JTAG controller.

The Pin Mapping Tab allows you to specify how the pins on the XJLink should be used, and in the case of XJLink2 and its derivative controllers also allows you to choose whether or not you want to power your circuit via the XJLink2. Most circuits cannot be powered from the XJLink2 due to its low output power but the XJDemo board is small and simple enough that it can be.

Normally you would set the location of each of the JTAG pins on the XJLink's connector(s). For XJDemo v4 there is a preset pin mapping in the XJTAG software which will save time in this tutorial.

If your board requires a Test Reset Sequence (TRST) to put one or more of the JTAG devices into JTAG mode, this can be set up on the Test Reset Sequence tab. There is more information on Test Reset Sequences here.

The next page in the wizard covers the association of the devices in the JTAG chain with their BSDL files.

Now that the JTAG connection to the board is specified, XJDeveloper will scan the JTAG chain when the Next button is clicked. It will read the ID codes from the devices in that chain, and match the ID codes with the files in the BSDL library that describe the implementation of JTAG on those devices.

Note: you are warned that powering your circuit in this way may damage your system. As the XJDemo board is designed to use USB power, click Yes to continue.