ATSAME54P20A supports 4-bit parallel trace. SAM E54 Xplained Pro implements a 20-pin, 50-mil Cortex Debug + ETM Connector with SWD and 4-bit parallel trace. The connector is keyed (pin 7 is removed).
To use the parallel trace functionality an external debugger with trace support and 20-pin Cortex Debug + ETM Connector pin-out has to be used. The table below shows the connections on the kit.
| Pin number | Pin/Net | Function | Shared functionality |
|---|---|---|---|
| 1 [VTREF] | VCC_TARGET_P3V3 | ATSAME54P20A voltage | |
| 2 [TMS/SWDIO] | PA31 | SWDIO | Cortex DBG and EDBG SWD |
| 3 [GND] | GND | Ground | |
| 4 [TCK/SWCLK] | PA30 | SWCLK | Cortex DBG and EDBG SWD |
| 5 [GND] | GND | Ground | |
| 6 [TDO/SWO] | PB30 | SWO | Cortex DBG and EDBG SWD |
| 7 [KEY] | - | Not connected, the pin is removed. | |
| 8 [TDI] | - | - | |
| 9 [GND] | GND | Ground | |
| 10 [nSRST] | RESET_N | Reset | RST BTN, Cortex DBG, and EDBG SWD |
| 11 [NC] | - | - | |
| 12 [RTCK/TRACECLK] | PC27 | TRACECLK | |
| 13 [NC] | - | - | |
| 14 [SWO/D0] | PC28 | TRACEDATA[0] | |
| 15 [GND] | GND | Ground | |
| 16 [ntRST/D1] | PC26 | TRACEDATA[1] | |
| 17 [GND] | GND | Ground | |
| 18 [DBGRQ/D2] | PC25 | TRACEDATA[2] | |
| 19 [GND] | GND | Ground | |
| 20 [DBGACK/D3] | PC24 | TRACEDATA[3] |