Figure 8.
JTAG, Nexus interface, Reset and crystal oscillator
EXTAL
XTAL
EVB-EXTAL
ESR0
PORST
RST-MCU
OSC-MOD
EVB-EXTAL
EXTAL-SMA
RST-SW
VCC
GND
2
3
14
1
7
74LVC125AMTR
U1A
I2
5
O2
6
O
E
2
4
74LVC125AMTR
U1B
VDD_HV_IO_MAIN
VDD_HV_IO_MAIN
VDD_HV_IO_MAIN
VDD_HV_IO_MAIN
3.3V_SR
VDD_HV_IO_MAIN
XTAL
EXTAL
ESR0
PORST
RST-SW
J TAG, Ne x u s In t e r fa c e , Re s e t a n d Cr ys t a l Os c illa t or
GND
GND
GND
GND
GND
GND
GND
GND
(MCU Crystal Input)
(MCU Crystal Output)
1-2 CLOSED
DEFAULT
1-2 CLOSED
DEFAULT
default OPEN
1-2 CLOSED
DEFAULT
GND
default CLOSED
default CLOSED
default CLOSED
REMOVE XTAL jumper when driving EXTAL from
Oscillator Module or External Source (PLL Enabled)
Connect XTAL jumper to GND when driving EXTAL from
Oscilaltor Module or External Source (PLL Bypass Mode)
Note - External 3.3V
egulator MUST be
enabled when using
oscillator module
Note - Internal
Pull-Up on Pin 1
SMA style
Connector
USER RESET LED
External Clock Input
MCU RESET LED
RESET
SO14
I3
9
O3
8
O
E
3
10
74LVC125AMTR
U1C
SO14
SO14
NOT MOUNTED
NOT MOUNTED
2
1
3
STRIP3PM
J19
0R
1/10W
0603
R11
1
2
40MHz
NX5032GA
XT1
0603
10pF DNP
50V
COG/NP0
C49
0603
10pF DNP
50V
COG/NP0
C51
0603
100nF
50V
X7R
C52
STRIP2PM
J20
2
1
3
STRIP3PM
J22
49R9
1/16W
0603
1%
R18
EN
1
GND
2
OUT
3
+Vs
4
8MHz
7x5
OSC1
10K
1/10W
0603
R14
560R
1/10W
0603
R12
4K7
1/10W
0603
R16
STRIP2PM
J29
Yellow
0805
LD1
STRIP2PM
J21
STRIP2PM
J30
220R
1/10W
0603
R15
220R
1/10W
0603
R17
560R
1/10W
0603
R13
Red
0805
LD2
2
1
3
STRIP3PM
J17
1
2
BNC-SMA-FEM-180
J25
VSS_OSC
ENABLE
GND
VCC
1
2
4
5
3
74V1G08STR
SOT23-5L
U2
RSTIN
TDI/Txn
TDO/Rxp
TCK
JCOMP/Rxn
TMS/Txp
GND
GND
GND
NOT MOUNTED
Jtag interface
TDI, TDO, TCK, TMS, JCOMP & RSTIN (PORST or ESR0)
are not connected to daughter card.
JTAG Connector
NOT MOUNTED
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
N2514-6002RB
J16
10K
1/10W
0603
R10
10K DNP
1/10W
0603
R9
0603
27pF
50V
COG/NP0
C48
0603
47pF DNP
50V
COG/NP0
C47
VDD_HV_IO_MAIN
VDD_HV_IO_MAIN
3.3V_SR
TDI/Txn
TCK
TMS/Txp
TDO/Rxp
GND
GND
Nexus interface
LVDS signals are not routed to motherboard.
JTAG signals are not routed to motherboard.
EVT signals have the option of adding a jumper on
daughtercard to route signals to motherboard.
GND
NOT MOUNTED
TX0P
1
TX0N
3
gnd
5
TX1P
7
TX1N
9
gnd
11
TX2P
13
TX2N
15
+V
2
TCK
4
TMS
6
TDI
8
TDO
10
JCOMP
12
EVTI1
14
EVTI0
16
EVTO0
18
RSTOUT
20
RSTIN
22
gnd
24
CLKP
26
CLKN
28
gnd
30
TX3P
19
gnd
23
gnd
29
n.c.
25
gnd
17
n.c.
27
TX3N
21
n.c.
31
EVTO1
32
n.c.
33
n.c.
34
SH1
SH1
SH2
SH2
SAMTEC ASP-137973-01
J18
0603
47pF DNP
50V
COG/NP0
C50
RSTIN
ESR0
JCOMP/Rxn
Pushbutton
SW1
UM2661
-
Rev 1
page 17/23
UM2661
Schematics