3.5.1 Debug JTAG
The SAM9X75-Curiosity board includes a 20-pin JTAG header (J34) to facilitate software development and debugging using various JTAG emulators. The interface signals have a voltage level of 3.3V.
The following figure shows the Debug JTAG.
The following table shows the Debug JTAG connector signal description.
| Pin No. | Signal Name | Signal Description |
|---|---|---|
| 1, 2 | VDD_3V3 | 3.3V |
| 3, 17, 19 | NC | Not connected |
| 4, 6, 8, 10, 12, 14, 16, 18, 20 | GND | Ground |
| 5 | JTAG_TDI | Test data in |
| 7 | JTAG_TMS | Test mode select |
| 9 | JTAG_TCK | Test clock |
| 11 | JTAG_RTCK | Return test clock |
| 13 | JTAG_TDO | Test data out |
| 15 | NRST | Reset |