Both LEDs are driven by GPIO pins of the MCU through current‑limiting resistors (typically 470 Ω to 1 kΩ). Some open‑source designs also add a connected to the MCU’s RESET pin – when pressed, it forces the debugger into firmware‑update mode.
Manages power for the board and the target device. jlink v9 schematic
High-speed, dual-supply translating transceivers like the 74LVC2T45 or 74AVC4T245 are typically deployed. Both LEDs are driven by GPIO pins of
