J-Link Adapters – An Overview
Adapters Available for J-Link
The following adapters are available for J-Link:
Adapters for Measurement, Signal Smoothing and Power Supply
J-Link Measurement+Patch Adapter:
The J-Link Measurement+Patch Adapter provides test points for all debug signals to allow easy access for test probes. It has a standard 20-pin 0.1" socket towards the J-Link debug probe and a standard 20-pin 0.1" header on the target side and can directly be inserted between the J-Link and the debug cable maintaining a 1:1 connection of all debug signals. For increased flexibility VTref on pin 1 and the target supply voltage on pin 19 can be interrupted by means of two jumpers.
J-Link Signal Smoothing Adapter:
The J-Link Signal Smoothing Adapter can be inserted between the J-Link debug probe and the debug target to overcome signal integrity issues. Depending on target load capacitance JTAG signals might be affected by overshoot and ringing. In this case user adjustable series resistors (default 47R) allow for damping critical signal rise/fall times leading to improved signal integrity.
J-Link Supply Adapter:
The J-Link Supply Adapter provides a fixed I/O voltage level for VTRef. It eliminates the need to connect VTRef (pin1) to the target.
In general, the target provides its I/O voltage level (VTRef) on pin 1 to the debug probe insuring the debug probe uses the right I/O voltages and avoiding damage of the target debug pins. If signal VTRef is not desired on the target board it can be omitted by using the J-Link Supply Adapter, manually setting the I/O voltage. Default I/O voltage is 3.3 V. For increased flexibility the J-Link Supply Adapter can adapt to other target voltages in the range from 1.2 V to 5.0 V by replacing a single resistor on the adapter.
J-Link Target Supply Adapter:
The J-Link Target Supply Adapter provides an adjustable supply voltage to the target board. It has a standard 20-pin 0.1" socket towards the J-Link debug probe and a standard 20-pin 0.1" header on the target side and can directly be inserted between the J-Link and the debug cable maintaining a 1:1 connection of all debug signals. The supply voltage to the target is provided through pin 19 of the debug cable.
5V Target Supply Adapter:
The 5V Target Supply Adapter provides a supply voltage of 5V to the target board. It has a standard 20-pin 0.1" socket towards the J-Link debug probe or Flasher and a standard 20-pin 0.1" header on the target side and can directly be inserted between the J-Link or Flasher and the debug cable maintaining a 1:1 connection of all debug signals. The supply voltage to the target is provided through pin 19 of the debug cable. The supply voltage is fixed to 5V.
Needle Adapters
J-Link 6-Pin Needle Adapter:
The J-Link 6-pin Needle Adapter has been designed to connect J-Link to a PCB which does not come with a mating connector or programming header. The designed pattern with 3 locating pins ensures, that the adapter can only be connected in one way. The 6-pin Needle Adapter allows manufacturers to save costs and space on their PCBs since there is no need to provide the PCB with additional connectors. It adapts from the 20-pin 0.1'' JTAG to a 6-pin needle connector.
J-Link 10-Pin Needle Adapter:
The J-Link 10-pin Needle Adapter has been designed to connect J-Link to a PCB which does not come with a mating connector or programming header. The designed pattern with 3 locating pins ensures, that the adapter cannot be connected the wrong way.
The needle adapter allows manufacturers to save costs and space on their PCBs since there is no need to provide the PCB with additional connectors.
It adapts from the 20-pin 0.1'' JTAG to a 10-pin needle connector.
Pinning Converters
J-Link 9-Pin Cortex-M Adapter:
The J-Link 9-pin Cortex-M Adapter allows JTAG, SWD and SWO connections between J-Link and Cortex-M based target hardware systems. It adapts from the 20-pin 0.1'' JTAG connector to a 9-pin 0.05'' Samtec FTSH connector as defined by ARM.
The J-Link 9-pin Cortex-M Adapter may also be used to connect J-Link to a non Cortex-M target as far as the target connector uses the same pinout as shown below.
By default, TRST is not connected, but the Cortex-M Adapter comes with a solder bridge (NR1) which allows TRST to be connected to pin 9 of the Cortex-M adapter.
J-Link 19-Pin Cortex-M Adapter:
The J-Link 19-pin Cortex-M Adapter allows JTAG, SWD and SWO connections between J-Link and Cortex-M based target hardware systems. It adapts from the 20-pin 0.1'' JTAG connector to a 19-pin 0.05'' Samtec FTSH connector as defined by ARM.
The J-Link 19-pin Cortex-M Adapter may also be used to connect J-Link to a non Cortex-M target as far as the target connector uses the same pinout as shown below.
By default, TRST is not connected, but the Cortex-M Adapter comes with a solder bridge (NR1) which allows TRST to be connected to pin 9 of the Cortex-M Adapter.
J-Link 14-Pin TI Adapter:
The J-Link TI 14-pin Adapter allows JTAG connections between J-Link and target hardware which use a TI MCU and provides a 14-pin connector (e.g. the BeagleBoard with an OMAP3530 on it), defined by TI. It adapts from the 20-pin 0.1'' to a 14-pin 0.1'' JTAG connector.
J-Link 2mm Adapter:
The J-Link 2mm Adapter adapts from the standard 20-pin J-Link connector to a 20-pin 2mm-pitch connector. The J-Link 2mm Adapter is a 1:1 adapter, since the pinout of the 2mm pitch connector is identical to the standard 20-pin J-Link connector.
Pins 14, 16, 18, 20:
On some models like the high-end model J-Link PRO, these pins may not be connected to GND but are reserved for future use/extension. In case of doubt, leave open on target hardware.
J-Link ARM-14 Adapter:
This adapter allows the use of J-Link with ARM7/9/11 targets using this 14-pin 0.1" mating JTAG connector defined by ARM.
The 14-pin connector, though defined by ARM as an alternative to the 20-pin connector is not widely used on modern eval boards.
J-Link Microchip Adapter:
The J-Link Microchip Adapter allows debug connections between J-Link and target hardware which comes with Microchip PIC32 series MCUs. It supports the RJ12 modular debug connector as specified by Microchip as well as the 14-pin dual row MIPS debug header and the Microchip 6-pin single row PICkit connector (options, can be soldered by customer on demand).
Note that the delivered modular cable will invert the pin order as shown in the pinout below.
J-Link Microchip 2-Wire JTAG TDI Adapter:
The J-Link Microchip 2-Wire JTAG TDI Adapter allows debug connections between J-Link and target hardware which comes with Microchip IS208x series MCUs. It supports the Microchip 5-pin single row .1" connector.
J-Link Mictor 38 Adapter:
The J-Link Mictor 38 Adapter connects to the 38 pin Mictor connector. The pin out follows the single target connector pinout specification as defined in the ARM "ETM Architecture Specification".
The adapter connects the GND and JTAG pins to their counterparts on the 20-pin J-Link. Trace pins present on the Mictor connector are not connected as they are not present on the 20-pin J-Link connector. The 38-pin Mictor side of the adapter can be plugged either directly into the target side or via trace cable. The J-Link side connects to J-Link via 20-pin flat cable.
J-Link PPC 14-Pin Adapter:
The J-Link PPC 14 pin Adapter allows JTAG connections between J-Link and target hardware which use an MCU with Power Architecture or PowerPC. It adapts from the 20-pin 0.1'' to a 14-pin 0.1'' JTAG connector.
Note: J-Link support for PowerPC is not yet available.
J-Link RX Adapter:
The J-Link RX Adapter allows connections between J-Link and target hardware which comes with the Renesas RX600/200/100 series MCUs.
The J-Link RX adapter is able to optionally power the connected target hardware. 3.3V or 5V supply voltage can be selected using a Jumper. The target is supplied via the VTref connection when the supply option is jumpered.
J-Link RX FINE Adapter:
The J-Link RX FINE Adapter allows connections between J-Link and Renesas RX based target hardware that supports the Renesas FINE interface (RX63xx, RX2xx, RX1xx CPUs).
SEGGER 50-Mil 10-Pin Patch Adapter:
Adapts from the standard 20 pin 0.1" J-Link connector to the standard 10-pin 0.05" Cortex-M connector that is also used on many non-Cortex-M designs but with non-standard pinout. This adapter allows custom connections/wiring between the 20-pin and 10-pin side.
SEGGER AVR PDI Adapter:
Adapts from the standard 20 pin 0.1" J-Link connector to the 6-pin 0.1" AVR PDI connector, 6-pin 0.05'' AVR PDI connector or 10-pin 0.1'' AVR PDI connector. Additionally a 5V or 3.3V power supply for the target is integrated.
SEGGER Flying Wire Adapter:
Adapts from the standard 20 pin 0.1" J-Link connector to a 10-pin row, allowing to connect J-Link to target PCBs via flying wires. Especially useful when hooking up prototype HW where no final connector is decided yet. Or for manually connecting a J-Link to ST Discovery boards.
SEGGER Intel FPGA Adapter:
The Intel FPGA Adapter (formerly J-Link Altera Adapter) connects to the 10-pin 100-mil Intel FPGA JTAG connector providing debug access to FPGA based MCU cores like the dual-core ARM Cortex-A9 in the Cyclone V devices.
J-Link SiLabs C2 Adapter:
The J-Link SiLabs C2 Adapter allows debug connections between J-Link and target hardware which comes with Silicon Labs C2 debug interface. It adapts from the 20-pin 0.1'' standard debug connector to a 10-pin 0.1'' connector with a pinout compatible with Silicon Labs eval boards.
J-Link TI-CTI-20 Adapter:
J-Link TI-CTI-20 Adapter adapts from the standard J-Link 20-pin 0.1" target connector to TI CTI-20 connector. This adapter allows to connect J-Link to eval boards with TI MCUs that are equipped with a TI CTI-20 connector, e.g. the AM335x evaluation module.
As can be seen in the image below, the key on pin 6 ensures, that the adapter can not be connected the wrong way.
J-Link Xilinx Adapter:
The J-Link Xilinx Adapter connects to the 14-pin 2 mm Xilinx JTAG connector providing debug access to FPGA based MCU cores like the ARM Cortex-A9 core in the Zynq devices.
SiFive-ARTY Adapter:
The SEGGER SiFive-ARTY Adapter allows debug connections between J-Link and the ARTY board running SiFive RISC-V core bitstreams. The ARTY board provides several identical headers where the JD header is used as the debug connector, when running SiFive RISC-V bitstreams on the ARTY board.
SEGGER RAFF Adapter:
The SEGGER RAFF Adapter is a Right Angle Female to Female adapter. It is a 1:1 adapter and therefore does not change the pinout and can be used as a replacement of the standard IDC ribbon cable. A compact debug or programming solution can be achieved with a J-Link Compact or Flasher Compact and the RAFF adapter plugged into a straight/vertical PCB pin header on the target application board.
