Central processing unit
US5682531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1995 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | Sep 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3861
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An instruction code includes a first memory address part 22 and a second memory address part 23, and when a microinstruction decoder 14 decodes an operation code of save or restore instruction of the instruction code prefetched by an instruction queue 13, a micro-ROM 15 assigns the task number specified by the first memory address part 22 to an index value, reads a register list of the task from a context save information specified by the second memory address part 23, and selectively saves or restores the content of the register specified by the register list. With this configuration, the central processing unit can save or restore the context with a small occupied memory quantity and at high speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.