AutoBuzz can then be set to gather a complete ‘connectivity map’ of any board’s boundary-scan to boundary-scan pin connections (where these can be direct or via ‘transparent’ devices such as series resistors). AutoBuzz supports just two simple operating modes: Learn and Compare. With AutoBuzz in Learn mode a ‘known good’ sample PCB is initially scanned to establish a reference connectivity map. Suspected faulty boards can then be scanned by AutoBuzz in Compare mode, and a comparison is automatically made of their connectivity maps.
Differences between the two maps are highlighted to indicate possible faults such as interconnect short-circuits, open-circuits or ‘stuck-at’ faults. For added reliability and reproducibility a constraints section allows critical pins to be set at fixed drive values as ‘guards’. Since the user requires no boundary-scan technical knowledge and with only a basic scan chain input needed, AutoBuzz is expected to find favour in repair and service centres as well as other debug arenas. Supported interfaces currently include Altera’s USB Blaster, Xilinx’s parallel III/IV and USB interfaces, JTAG Technologies’ JT 3705 / USB controller, JTAGLive dedicated USB controller and some FTDI based modules.
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