J-Link OB

J-Link OB is a single chip microcontroller "on-board" of an eval board. The microcontroller has a USB-interface on one side and a JTAG/SWD + SWO interface on the device side. It allows debugging any supported device without the need for an additional debug probe (emulator).

J-Link OB is used on various eval boards by several eval board manufacturers for various target CPUs.

Features

Fully compatible to and same features as regular J-Link
Inexpensive solution for complete evaluation kits with debug functionality
JTAG, SWD + SWO supported
Optional disable allows use of other external debug probes
Compatible with most IDEs
Very small form factor

Basic concept

The picture below shows the connection between the target and a PC using the regular J-Link.

The picture below shows the connection between the target and a PC using the J-Link OB.

Why J-Link OB?

Having a J-Link right on the eval board allows customers to fully use and test the target CPU, providing full debug capabilities. At the same time, the eval board can remain small and inexpensive. All features of the regular J-Link can be used, including downlaod into Flash memory.

Which devices can be used as J-Link OB?

First of all, J-Link OB is not much more than a Microcontroller with USB device interface running J-Link firmware. This firmware is currently available for the following microcontrollers:

ATMEL AT91SAM7S64 (ARM7 based)
NXP LPC2146 (ARM7 based)
ST STM32F103C8 (Cortex-M3 based)

Other microcontrollers can be supported upon request.

Who can license J-Link OB?

J-Link OB is licensed to eval board manufacturers and silicon vendors only.
If you qualify and are interested, please contact info@segger.com for more information.

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