Bus sourcing and shifter control of a central processing unit
US4451883A · kind A · utility
11Cited by
6References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1981 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Dec 1, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30167
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system includes a memory subsystem for storing operands and instructions and a central processing unit (CPU) for manipulating the operands by executing the instructions. The CPU includes a control store for generating signals for controlling the CPU operation. Shifters made up of multiplexers shift operands between an outer bus and a write bus in response to control store signals. The multiplexers shift the operands left or right 1, 2 or 4-bit positions including open shifts and circular shifts and also perform byte position shifting and twinning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.