jlink problem

[Miroslav]

Hi, My Jlink lite CortexM work with nrf51822 DK boards. But my PCB with nrf51822_xxAA chip can't download code. I'm using ukeil When I chek in utilities Jlink can't recognize SW IDCODE of device. All is set good. PCB is 100% good. Thank you.

[wlgrd]

Can you post the schematic for your programming connections? Is the external board powered? What voltage? The jlink lite has some minimum target power required, can't remember exact numbers...