Data processing system having unique microinstruction control and stack means
US4939640A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1984 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Apr 5, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/223
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system which includes a memory and a processor comprising at least two execution units. The system further includes a microcode control unit for storing sequences of microinstructions and an execution microinstruction stack containing at least one stack frame containing the machine state of a first execution unit when the execution of a microinstruction has been interrupted. A memory microinstruction stack is provided to store a plurality of stack frames, stack frames being transferrable between the execution microinstruction stack and the memory microinstructiion stack. The microcode control unit contains sequences of monitor microinstructions and has associated with it a minotor microinstruction stack for storing the machine state of the first execution unit when the execution of a monitor microinstruction has been interrupted. A second execution unit for executing primarily arithmetic microinstructions includes an execution storage unit containing the current machine state of the second execution unit and an arithmetic stack which stores the machine state of the second execution unit when it has executed a previous arithmetic microinstruction. The memory includ…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.