Barrel shifter or multiply/divide IC structure
US5465222A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1994 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | Feb 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F5/015
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A barrel shifter or multiply/divide integrated circuit (IC) structure includes a plurality of stages in series. The number of stages is a function of the number of bits in an input digital data word, and each stage in sequence provides for a different power of two rotary or multiply/divide shift of the digital data word at the input if selected. A multiplexer in each stage selects as an output either the shifted digital data word or the input digital data word for output to the next stage according to a shift amount select command. At the input and output of the series of stages an additional reversal multiplexer selects in response to a shift direction command either the digital data word or a reversed version of the digital data word, which determines the effective direction of the shift in the stages. Logic may be included in each stage to determine whether the shift operation is a rotary or multiply/divide shift operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.