Microprogrammed control of extended integer and commercial instruction processor instructions through use of a data type field in a central processor unit
US4491908A · kind A · utility
12Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1981 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Dec 1, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/268
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system includes a microprogram controlled central processing unit that executes instructions. The instruction words include a data type field for identifying the type of operand processed during the execution of the instruction. The data type field signals and a number of control signals are applied to the address terminals of a read only memory. The read only memory output signals are tested by microwords of a microprogram to branch to firmware routines to process the operand type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.