ARITHMETIC UNIT FOR USE IN DATA PROCESSING SYSTEM

摘要

A data processing system requiring fixed point and floating point computation operations comprises an arithmetic computation unit for providing fixed point arithmetic computations and a floating point computation unit for providing floating point arithmetic computations. A control store supplies microinstructions to control the operations of both the arithmetic computation unit and the floating point computation unit. Both units are responsive to several commonly shared control fields of the microinstructions during their respective operations and the floating point computation unit is also responsive to at least one additional control field during its operation. The complexity and cost of the system are reduced over systems which require two complete separate control stores or two completely separate sets of control fields of a single control store.