Ok, have a newly designed board that I'm trying to bring up.
Very simple circuit with an ATSAMS70J21 chip, 3.3V regulator, 12MHz xtal, UART/USART and SPI IF's.
Using the SWD to an Atmel SAM-ICE probe and Atmel Studio 7. SWD connects to PB6 (SWDIO), PB7 (SWCLK), NRST, 3.3V, and GND.
Can read target voltage fine but not ID. Get the error pop-up:
Timestamp: 2019-06-18 11:04:46.848
ModuleName: TCF (TCF command: Device:startSession failed.)
Reading ARM chip id failed.
JTAGSEL pin is left unconnected.
Thanks for any help.