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User Manual for J-Link JTAG Isolator 3/4
Connecting the Isolator to Target and Emulator
Figure 3.
Connecting the Isolator to Target and Emulator
VCC
1
2
VCC
Isolator
Target
nTRST
TDI
3
5
4
6
GND
GND
J-Link
Flat cable
CPU
TMS
7
8
GND
TCK
9
10 GND
RTCK
TDO
11
13
12
14
GND
GND
Isolator
Target
GND
RESET
N/C
N/C
15
17
19
16 GND
18
20 GND
J-Link
Flat cable
CPU
The Emulator side of the Isolator is plugged directly into the Emulator. The
Target side is connected to the target via a 20-pin flat cable.
Using the Isolator with J-Link
In order to use the Isolator, follow these steps:
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Plug the Isolator directly into J-Link.
Power J-Link.
Make sure the green LED on the emulator side is lit. If it is not, follow the
instruction in the next section.
Connect the target via 20-pin flat cable to the target side of the Isolator.
If the target is powered, the green LED on the target side should be lit.
The red LED on the target side is lit when a Target RESET is active (low).
Preparing J-Link to supply power
J-Link needs to supply 5V power to the emulator side of the adapter on pin 19.
In order to do this, you may have to configure J-Link once as follows:
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Make sure that SEGGER J-Link software is installed on your machine.
It can be downloaded from http://www.segger.com/download_jlink.html
Start J-Link Commander, which can be found under “ Start -> Programs -
> SEGGER -> J-Link ARM ”
Enter the following command: power on perm
Plug in the adapter: The LED on the emulator side should now be lit.
Using the Isolator with an other ARM emulator
The Isolator has been designed for J-Link, but can also be used with other ARM
emulators with the same pin-out. In this case, you should make sure that 5V
are supplied to pin 19 of the emulator connector and that your emulator is not
damaged when applying 5V to this pin. Do this at your own risk!
? 2008 SEGGER Microcontroller GmbH & Co. KG
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