Figure 3-39. JLINK-OB Interface
EDBG_USB_DP
EDBG_USB_DM
ENSPI
ERASE_3U
TDI_3U
TDO_3U
TCK_3U
TMS_3U
NRST_3U
TRSTIN
TRSTOUT
TRESIN
TRESOUT
TDIIN
TMSIN
TCKOUT
TMSOUT
TDIOUT
TDOIN
TCKIN
ENSPI
TCKOUT
PA25_3U
PA26_3U
LED2_3U
LED1_3U
EDBG_XIN
RX_3U
TX_3U
EARTH_USB_EDBG
VDD_3V3_3U
VDD_OUT_3U
VDD_3V3_3U
GND_POWER
VDD_3V3_3U
VDD_3V3_3U
GND_POWER
GND_POWER
VDD_3V3_3U
GND_POWER
VDD_3V3_3U
VBUS_JLINK
VDD_3V3_3U
GND_POWER
RTCKIN
R210
100R-1%
R0402
R211
39R R0402
R209
100R-1%
R0402
R215
100K
R0402
VBUS
SHD
DM
DP
ID
GND
J9
MicroUSB AB Connector
USBMICRO5_6A
1
2
3
4
5
8
6
1
1
7
9
10
R212
39R R0402
C156
100nF
C0402
R208
10K
R0402
R245
0R
R214
6.8K-1%
R0402
C136 10nF
C0402
D5
PMEG6010CEGWX
sod123
Y4
ASE-12.000MHz-LC-T
NC
1
VCC
4
Out
3
GND
2
U20
ATSAM3U4CA-CU
TFBGA100
VBG
A1
XIN
A2
XOUT
A3
P
B
1
7
A
4
P
B
2
1
A
5
P
B
2
3
A
6
TCK/SWCLK
A7
V
D
D
IN
A
8
V
D
D
O
U
T
A
9
XIN32
A10
V
D
D
C
O
R
E
_
1
B
1
G
N
D
U
T
M
I
B
2
V
D
D
U
T
M
I
B
3
P
B
1
0
B
4
P
B
1
8
B
5
P
B
2
4
B
6
NRST
B7
TDO/TRACESWO
B8
TDI
B9
XOUT32
B10
DFSDP
C1
DHSDP
C2
G
N
D
P
L
L
C
3
P
B
1
4
C
4
P
B
1
9
C
5
P
B
2
2
C
6
TMS/SWDIO
C7
NRSTB
C8
JTAGSEL
C9
V
D
D
B
U
C
1
0
DFSDM
D1
DHSDM
D2
V
D
D
P
L
L
D
3
V
D
D
C
O
R
E
_
2
D
4
P
B
2
0
D
5
ERASE
D6
TST
D7
FWUP
D8
PA11/PGMD3
D9
PA12/PGMD4
D10
PA29
E1
G
N
D
_
1
E
2
PA28
E3
P
B
9
E
4
G
N
D
B
U
E
5
V
D
D
IO
_
3
E
6
V
D
D
C
O
R
E
_
3
E
7
PA10/PGMD2
E8
PA9/PGMD1
E9
PA8/PGMD0
E10
P
B
1
F1
P
B
1
2
F2
V
D
D
IO
_
1
F3
PA31
F4
V
D
D
IO
_
2
F5
G
N
D
_
2
F6
P
B
1
6
F7
PA6/PGMM2
F8
V
D
D
C
O
R
E
_
6
F9
PA7/PGMM3
F10
P
B
1
1
G1
P
B
2
G2
P
B
0
G3
P
B
1
3
G4
V
D
D
C
O
R
E
_
5
G5
G
N
D
_
3
G6
P
B
1
5
G7
PA3/PGMNVALID
G8
PA5/PGMM1
G9
PA4/PGMM0
G10
V
D
D
C
O
R
E
_
4
H
1
P
B
5
H
2
PA27
H3
PA22/PGMD14
H4
PA13/PGMD5
H5
PA15/PGMD7
H6
PA18/PGMD10
H7
PA24
H8
PA1/PGMRDY
H9
PA2/PGMNOE
H10
P
B
6
J1
P
B
8
J2
ADVREF
J3
PA30
J4
P
B
3
J5
PA16/PGMD8
J6
PA19/PGMD11
J7
PA21/PGMD13
J8
PA26
J9
PA0/PGMNCMD
J10
P
B
7
K
1
V
D
D
A
N
A
K
2
G
N
D
A
N
A
K
3
AD12BVREF
K4
P
B
4
K
5
PA14/PGMD6
K6
PA17/PGMD9
K7
PA20/PGMD12
K8
PA23/PGMD15
K9
PA25
K10
C137 10pF
C0402
C132 10nF
C0402
R213
DNP
R0402
VDD_3V3_3U
R216
150R-1%
R0402
R217
150R-1%
R0402
D6
KPTB-1615
Green
4
1
1
RED
2
3
3
LED1_3U
LED2_3U
ERASE_3U
VDD_3V3_3U
JP11
Header 1X2
1 2
3.4.2.1
Disabling JLINK-OB (ATSAM3U4C)
Jumper JP10 disables the J-Link-OB-ATSAM3U4C JTAG functionality. When the jumper is installed, it
grounds pin 26 of the ATSAM3U4C that is normally pulled high. A quad analog switch is used to select
the JTAG interface.
•
Jumper JP10 not installed: J-Link-OB-ATSAM3U4C is enabled and fully functional.
•
Jumper JP10 installed: J-Link-OB-ATSAM3U4C is disabled and an external JTAG controller can be
used through the 10-pin JTAG port J2.
Jumper JP10 disables only the J-Link functionality. The debug serial com port that is emulated through a
Communication Device Class (CDC) of the same USB connector remains operational (if JP9 is open).
Figure 3-40. Enabling/Disabling JLINK-OB and JLINK-CDC
JTAG-OB disable
JTAG-CDC disable
PA25_3U
PA26_3U
VDD_3V3_3U
GND_POWER
GND_POWER
VDD_3V3_3U
JP9
Header 1X2
1 2
R224
10K
R0402
R225
10K
R0402
JP10
Header 1X2
1 2
SAMA5D2-PTC-EK
Board Components
©
2017 Microchip Technology Inc.
DS50002709A-page 38