This adapter board converts the traditional 2x10 (0.1"/2.54mm pitch) JTAG cable to a narrower 2x5 (0.05"/1.27mm pitch) SWD cable, making it more convenient for connecting devices such as JTAGulator or SEGGER J-Link to mini boards with a 10-pin SWD programming connector. This is a 10-pin and 20-pin connector flat ribbon cable, easy to insert directly into the PCB, ribbon cable saves the space and time of the circuit interconnection components. The breakout board features double-sided immersion gold plating, which prevents oxidation and ensures high-quality performance. Boundary scanning enables access to the internal signal logic state of the chip and the status of chip pins, among other things. It's compatible with ARM-USB-OCD, ARM-USB-OCD-H, ARM-USB-TINY, ARM-USB-TINY, as well as Segger's JLINK and other JTAG/SWD programmers/debuggers, system programmers, Isp downloader.