J-Link/J-Trace ARM User guide of the JTAG emulators

http://www.cadfamily.com/downinfo/302868.html

In general,J-Link/J-Trace should be powered on before connecting it with the target
device.That means you should first connect J-Link/J-Trace with the host system via
USB and then connect J-Link/J-Trace with the target device via JTAG.Power-on the
device after you connected J-Link/J-Trace to it.
5.1.2 Verifying target device connection
If the USB driver is working properly and your J-Link/J-Trace is connected with the
host system, you may connect J-Link / J-Trace to your target hardware.Then start
JLink.exe which should now display the normal J-Link/J-Trace related information
and in addition to that it should report that it found a JTAG target and the target??s
core ID. The screenshot below shows the output of JLink.exe. As can be seen,it
reports a J-Link with one JTAG device connected.