There is a long-standing debate in the community: Does the J-Link V9 use an FPGA?
Before examining the schematic, one must understand the functional blocks. The J-Link V9 is not a single-chip solution; it is a composite device. jlink v9 schematic
The V9 version significantly upgraded the internal hardware from previous iterations (like the V8) to support faster clock speeds and better voltage handling. There is a long-standing debate in the community:
: Most V9 designs utilize an STM32F205 series MCU. This chip provides the necessary USB 2.0 Full Speed connectivity and high-speed GPIOs for JTAG signaling. jlink v9 schematic