Schematic [cracked] — Jlink V9

The schematic typically includes level shifters and buffers to protect the main MCU and allow it to interface with target boards running at different voltages (usually 1.2V to 5V). Protection Circuitry:

The board usually features multiple LDOs (Low-Dropout Regulators) to derive 3.3V and 1.8V from the 5V USB bus power. jlink v9 schematic

Elias realized this wasn't a standard programmer. It was a Trojan horse. Someone had used the J-Link's trusted position in the development chain to inject code directly into the silicon of every device it touched. The schematic typically includes level shifters and buffers