My first MCU PCB and a new JTAG Cortex + ETM connector
As brhans said, you can just use a standard JTAG. What I did on a recent design, I placed both a trace connector (for debugging) and a simple SWD connector (for production programming).

If you do want to put an Trace connector on your board, here are your answers:


Pin 7 is not fitted and acts as a key to prevent the connector from being plugged in backwards. The hole is plugged on some receptacles.
N_RESET is MCU reset.
Pins 11 and 13 are power supply pins from the programmer to the target hardware. You can leave them floating if unused.


Also, have a look at the JLink manual, page 400.