JTAG debugging of USB device

Hello,

I’m running into the problem that when I connect my JTAG debugger (Segger J-Link) to my target (SAM7X256), the usb connection to the target stops working. There are slight variations depending on whether the JTAG debugger takes control or not, but it’s made it rather hard to debug my target which is controlled over usb.

My best guess is that there is a problem with the clocking - if the debugger is running at 12 MHz, should that be a problem?

Thanks,

  • AR