Jlink V9 Schematic -

If you search GitHub or Chinese hardware forums (like 52arm.com or amobbs.com), you will find several reverse-engineered schematics. While Segger has never officially released the V9 schematic (it is a proprietary trade secret), hobbyists have traced the PCBs.

Using such schematics to build a personal debugger for learning purposes is generally accepted as fair use. However, manufacturing and selling clones that use SEGGER’s proprietary firmware is a violation of the company’s license terms and may infringe on patents or trademarks. jlink v9 schematic

At the heart of the J-Link V9 schematic is a high-performance microcontroller that handles USB communication, protocol translation (USB to JTAG/SWD), and timing control. If you search GitHub or Chinese hardware forums (like 52arm