I have used LPC2378 on my board. when the LPC2378 is in Virgin state (fresh IC never had been programmed), and i connect the Ulink2 to target PCB. But JTAG doesnt recognize the target IC. when i flash the program thr' serial programming utility such as "Flash magic" and then connect to Ulink2, JTAG easily detects the target hardware. i am clueless? what is the problem?