ALU and Condition code control unit for data processor
US4312034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30167
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processor which is adapted for microprogrammed operation has a control store includes an ALU and condition code control unit for controlling operations performed by an arithmetic-logic unit within the execution unit of the data processor and for controlling the setting of the condition code bits in a status register. The ALU and condition code control unit is arranged in a row and column format. A decoder coupled to a macroinstruction register selects a row which is selected over an entire period that is required to execute macroinstruction. The row corresponds to a set of operations and condition code settings associated with a particular macroinstruction. The control store output provides information for selecting the proper column during each microcycle used to execute the macroinstruction. ALU function control signals and the condition code control signals are selected simultaneously according to the selected row and column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.