Data processor executing microprograms according to a plurality of system architectures
US4691278A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1985 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Apr 23, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3017
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processor controlled by microprograms which can run a desired program in a selected one of multiple system architectural modes. In the data processor, the operation code of the instruction is used as an address for a decoding information storage which stores a plurality of pairs of a microinstruction start address and an editing format control word. A selector selects a pair of a start microinstruction address and an editing format control word. The microinstruction start address is used for accessing a microcode control storage storing a plurality of microprograms in microinstruction form. The editing format control is used as an editing designation signal for editing the operand of the instruction according to the selected mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.