Direct-execution microprogrammable microprocessor system
US4761733A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1985 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Mar 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0875
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A direct-execution microprogrammable microprocessor system uses an emulatory microprogrammable microprocessor for direct execution of microinstructions in main memory through a microinstruction port. A microinstruction cache with a microinstruction address extension unit serving to communicate microinstructions from the main memory to the microprogrammable microprocessor. Virtual main memory accesses occur through a system multiplexer. A virtual address extension unit and a virtual address bus provide extension and redefinition of the main memory address space of the microprogrammable microprocessor. The system also uses a context switching stack cache and an expanded address translation cache with the microprogrammable microprocessor having a reduced and redefined microinstruction set with a variable microinstruction cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.