SUPERCONDUCTING READ-ONLY MEMORIES OR PROGRAMABLE LOGIC ARRAYS HAVING THE SAME

摘要

: An A.C. powered type logic array of very high speed operation employs Josephson devices and can program any desired logic. The logic array comprises a first logic array that delivers AND logic signals from input signals, and a second logic array that delivers OR logic signals from desired ones of the AND outputs. Each of the first and second logic arrays comprises a plurality of bit lines that connect a plurality of arrayed Josephson devices in series at respective rows, and each of which has one end connected to a power source and the other end grounded through a resistor. Word lines are arranged in the column direction of the Josephson device array and are selectively coupled to the Josephson devices. Whether or not the word lines are coupled to the respective Josephson devices of the arrays, is determined by the patterns of the word lines or the patterns of the Josephson devices, whereby to program the desired logic. The system is an improvement over the prior art in facilitating rapid and easy changing of the logic.