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Recommended order of connecting and switching power on target HW with ULINK2?

Which is the recommended order of connecting and switching power on target hardware (HW) with ULINK2?

In the on-line manual "Connecting ULINK2" www.keil.com/.../ulink2_su_connecting.htm you can read: "In most cases, you simply plug the ULINK2 JTAG cable into the JTAG plug on your target hardware and then plug the USB cable into your PC using a standard USB cable."

There is no recommended timing, from when the target HW should be switched on.

Possible situations could be:
a) power on target HW, connect JTAG, connect USB
b) connect JTAG, power on target HW, connect USB
c) connect JTAG, connect USB, power on target HW

Which case is recommendable?
Or maybe does the order of switching the power on the target HW make no difference?

In my case the PC is always switched on (and with it also USB power).

Martin

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