Two-stage pipelined execution unit and control stores
US4685058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1986 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Aug 15, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/3867
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A two control store scheme with instruction execution overlay is shown in a data processing system execution unit having a two-state pipeline. The first control store controls the first-stage facilities during the first cycle of instruction execution and points to the initial location of the second control store. The second control store controls the second-state facilities during the final cycle of instruction execution. The second control store also controls the facilities of both stages during the intermeidate cycles of instruction requiring more than two cycles to execute. Because the second control store controls only the second-stage facilities during the final cycle, execution of the first cycle of the following instruction can take place concurrently within the first-stage facilities under the control of the first control store.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.