Atmel SAME70-XPLD User Manual

4.4.8. Debug JTAG/ICE
A 2×10-pin JTAG header is implemented on the SAME70-XPLD board to enable software development
and debugging of the board by using various JTAG emulators. The interface signals have a voltage level
of 3.3V.
Figure 4-27 JTAG/ICE Interface Schematic
ARM JTAG
SWDIO
SWCLK
TRACESWO
VCC_3V3
PB6
PB7
PB5
TARGET_RESET
R401
0R
R402
0R
R403
0R
J406
12
34
6 5
78
910
1112
1314
1516
1718
1920
R400
0R
Table 4-22 JTAG/ICE Connector J406 Signal Descriptions
Pin Signal Type Signal Description
1 VTref /
VCC_3V3
Input This is the target reference voltage. It is used to
check if the target has power, to create the logic-
level reference for the input comparators and to
control the output logic levels to the target. It is
normally fed from Vdd of the target board and must
not have a series resistor.
2 Vsupply /
VCC_3V3
Not Used This pin is not connected in J-Link. It is reserved for
compatibility with other equipment. Connect to Vdd
or leave open in target system.
3 Not used NC This pin is not used by J-Link. If the device may
also be accessed via JTAG, this pin may be
connected to nTRST, otherwise leave open.
5 Not used NC This pin is not used by J-Link. If the device may
also be accessed via JTAG, this pin may be
connected to TDI, otherwise leave open.
7 SWDIO I/O Single bi-directional data pin.
9 SWCLK Output Clock signal to target CPU. It is recommended that
this pin is pulled to a defined state of the target
board. Typically connected to TCK of target CPU.
11 Not used NC This pin is not used by J-Link. This pin is not used
by J-Link when operating in SWD mode. If the
device may also be accessed via JTAG, this pin
may be connected to RTCK, otherwise leave open.
13 SWO Output Serial Wire Output trace port. (Optional, not
required for SWD communication.)
15 RESET I/O Target CPU reset signal. Typically connected to the
RESET pin of the target CPU, which is typically
called "nRST", "nRESET" or "RESET".
17 Not used NC This pin is not connected in J-Link.
Atmel SAME70-XPLD [USER GUIDE]
Atmel-44050A-SAME70-XPLD_User Guide-12/2015
37

Atmel SAME70-XPLD Specifications

General

Brand	Atmel
Model	SAME70-XPLD
Category	Motherboard
Language	English