System including central processing unit
US5301338A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1990 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Aug 17, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A central processing unit includes a programmable logic array, a timing control unit, a predecoder, a data input/output part, and a processing part. The processing part carries out a predetermined operation on m-bit low-order data from among data which is composed of n bits and which is read out from a memory and m-bit high-order data from among the data composed of n bits, and outputs a carry signal when the predetermined operation on the m-bit low-order data results in a carry. When the operation code is a read modify write instruction and when the processing part outputs the carry signal, the programmable logic array controls the input/output part so that only the result of the predetermined operation on the m-bit low-order data is written into the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.