Decoding circuit and method providing immediate data for a micro-operation issued from a decoder
US5581717A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1994 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Mar 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/35
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Decoding circuitry and a method supplying an immediate field that is issued from a decoder. A macroinstruction is supplied to the decoding circuit, which generates a first micro-operation that includes a first aliasing field and a first immediate field. The first aliasing field indicates the source of the micro-operation that will eventually be issued from the decoder. If the source is the first immediate field, then the alias field is further examined to determine the interpretation to be placed upon the data. The data may be interpreted literally, or as an address into a constant ROM, thereby providing an ability to output wide, 32-bit immediate data from a narrower, 9-bit input addresses. Additional sources for immediate data include macro-alias registers, macro-branch information, and micro-branch information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.