Domino-CMOS barrel switch for 32-bit VLSI processors

The flowthrough-type barrel switch plays an important role in highspeed 32-bit microprocessor operations. Arithmetic operations with multiplication or division and logical operations with data field manipulation can be expedited using a barrel switch. This paper describes a full-fledged CMOS 32-bit barrel switch and its physical design. With an extensive use of domino-CMOS circuits with undecoded control signals, a highspeed, area-efficient barrel switch was designed to shift or rotate 32-bit data to the left or right by any number of bit positions between 0 and 31. Operating principles, timing requirements, gate matrix layout, and simulation and test results are discussed.