HUAWEI ME909 Series LTE LGA Module
Hardware Guide
Description of the Application Interfaces
Issue V0.3 (2013-05-21)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
37
3.10 JTAG Interface
The ME909 module provides Joint Test Action Group (JTAG) interface. Table 3-12
shows the signals on the JTAG interface. It is recommended that route out the 9 pins
as test points on the DTE for tracing and debugging.
Table 3-12
Signals on the JTAG interface
Pin
No.
Pin Name
I/O Description
DC Characteristics (V)
Min.
Typ.
Max.
30
JTAG_TMS
I
JTAG test mode
selection
–0.3
1.8
2.1
36
JTAG_TRST_N I
JTAG test reset
–0.3
1.8
2.1
42
JTAG_TCK
I
JTAG test clock
–0.3
1.8
2.1
72
JTAG_TDO
O
JTAG test data
output
–0.3
1.8
2.1
87
JTAG_TDI
I
JTAG test serial
data input
–0.3
1.8
2.1
93
JTAG_RTCK
O
JTAG test clock
return signal
–0.3
1.8
2.1
14
PS_HOLD
I
Power supply hold
signal to PMU
–0.3
1.8
2.1
47
JTAG_SRST_N I
JTAG reset for
debugging
–0.3
1.8
2.1
32
VCC_EXT1
P
Pin for output
power supply with
1.8 V
1.75
1.8
1.85
It is recommended that customer route out the JTAG pins on the DTE board as test points for
debugging.
