Title :
Josephson address control unit IC for a 4-bit microcomputer prototype
Author :
Kosaka, S. ; Nakagawa, H. ; Kawamura, H. ; Okada, Y. ; Hamazaki, Y. ; Aoyagi, M. ; Kurosawa, I. ; Shoji, A. ; Takada, S.
Author_Institution :
Electrotech. Lab., Ibaraki, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors describe the design and operation of a Josephson address control unit IC (integrated circuit), which will be used for controlling the instruction sequence of an experimental 4-bit Josephson microcomputer prototype system. The IC is composed of three sets of 7- to 10-bit-wide registers and combinational logic circuits driven by a two-phase monopolar power supply. 593 four-function logic gates have been used in the circuit and fabricated using 2.5-μm NbN/oxide/NbN junction technology with Mo resistors and SiO2 insulation. The operation of the circuit has been successfully tested for all the instructions which control the program sequence of the computer system
Keywords :
integrated circuit technology; microprocessor chips; niobium compounds; superconducting junction devices; superconducting logic circuits; 2.5 micron; 4 bits; 4-bit microcomputer; 7 to 10 bits; Josephson address control unit IC; Josephson microcomputer; Mo resistors; SiO2 insulation; combinational logic circuits; design; four-function logic gates; operation; prototype; two-phase monopolar power supply; Circuit testing; Combinational circuits; Control systems; Josephson junctions; Logic gates; Microcomputers; Power supplies; Prototypes; Registers; Resistors;
Journal_Title :
Magnetics, IEEE Transactions on
