Jtag Interface - Huawei ME909u-521 Hardware Manual

HUAWEI ME909u-521 LTE LGA Module
Hardware Guide

3.10 JTAG Interface

The ME909u-521 module provides Joint Test Action Group (JTAG) interface. Table
3-11 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 3-11 Signals on the JTAG interface
Pin Pin Name
No.
30 JTAG_TMS
36 JTAG_TRST_N
42 JTAG_TCK
72 JTAG_TDO
87 JTAG_TDI
93 JTAG_RTCK
14 PS_HOLD
47 JTAG_SRST_N
32 VCC_EXT1
Issue 05 (2017-12-15)
Pad Description
Type
I JTAG test mode select
I JTAG reset
I JTAG clock input
O JTAG test data output
I JTAG test data input
O JTAG return clock
I Power supply hold
signal to PMU, used
for JTAG
I JTAG reset for
debugging
PO 1.8 V POWER output
It is recommended that customer route out the JTAG pins on the DTE board as test points for
debugging.
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Description of the Application Interfaces
Parameter Min. Typ.
(V) (V)
V 1.17 1.8
IH
–0.3
V -
IL
V 1.17 1.8
IH
–0.3
V -
IL
V 1.17 1.8
IH
–0.3
V -
IL
V 1.35 1.8
OH
V 0 -
OL
V 1.17 1.8
IH
–0.3
V -
IL
V 1.35 1.8
OH
V 0 -
OL
V 1.17 1.8
IH
–0.3
V -
IL
V 1.17 1.8
IH
–0.3
V -
IL
-
1.75 1.8
Max. Comments
(V)
2.1 -
0.63 -
2.1 -
0.63 -
2.1 -
0.63 -
1.8 -
0.45 -
2.1 -
0.63 -
1.8 -
- -
2.1 -
0.63 -
2.1 -
0.63 -
-
1.85
41