J-Link is a USB JTAG dongle from the company Segger. It is very commonly bundled with evaluation boards from some other companies.
- Atmel AT91SAM7 ARM 7 microcontroller
- This allows the dongle to do low-level JTAG communication actions in high speed without involvement from the PC. This is faster compared to bitbanging done in the commonly used FT2232 based JTAG dongles.
- Two ALVC164245 levelshifter transceivers
- This provides support for 1.2V-3.3V targets and 5V tolerance.