I recently got a ATSAMV71N20 and an N21 and both work for SWD. JTAG on the other hand gives this error message:
Could not activate interface, but found DAP with ID 0x5b3d03f..
This usually indicates that the device is locked or in deep sleep. Try to do a chip erase to restore connectivity to the device.
Unable to enter programming mode. Verify device selection, interface settings, target power, security bit, and connections to the target device.
I'm using a socket just to test the jtag but all power is connected properly. When TST is held high with JTAGSEL also high (PD0 is low) I'm able to get this message. if TST is held down, I can use SWD.
I already erased the chip and nothing. I really need it to be JTAG functional. Any suggestions or is there something missing?