On-Chip Multiplexer Oriented System for Josephson Testing
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
MOST (Multiplexer Oriented System for Testing) is a comprehensive test scheme for making circuit nodes highly visible to tester equipment. Its implementation does not suffer the penalty of large amounts of chip area and/or I/O being dedicated solely to testing. By taking advantage of the latching nature of Josephson logic and its high serial fanout capabilities, nodes to be monitored can be multiplexed into the existing shift register latch string so that their data can be serially shifted to the tester equipment. This system-oriented scheme is available for testing and diagnostic purposes at chip, module and machine levels.