You're looking for the schematic of the JLink V9!
Unveiling the JLink V9 Schematic: A Comprehensive Overview jlink v9 schematic
Years ago, the V9 schematic had been a closely guarded secret, a master key for ARM debugging. Now, in the era of open-source clones and grey-market "re-engineered" boards, the schematic was a legend passed around on encrypted forums. Elias had spent months piecing his copy together—gathering blurry photos of PCB layers, cross-referencing datasheets for the voltage regulators, and reverse-mapping the level shifters that allowed the probe to "talk" to chips at varying voltages. You're looking for the schematic of the JLink V9
If you work with ARM microcontrollers, the Segger J-Link is the industry standard. It’s the debug probe that every other probe is compared against. But while Segger is famous for their software—the J-Link SDK, RTT, and their blazing-fast download speeds—the hardware itself is often treated as a "black box." Elias had spent months piecing his copy together—gathering
The J-Link V9 schematic represents a design philosophy focused on rather than complex hardware logic. By utilizing a high-performance NXP LPC microcontroller and robust buffering, Segger created a hardware platform that acts as a transparent pipe between your PC and your target.