Dual-port array with storage redundancy having a cross-write operation
US5359557A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Dec 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/74
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system in a data processing system for providing a dual-port memory device having redundant data stored in multiple memory arrays. A first set of data and address latches, coupled to a first data port, are provided for storing data and address information. A second set of data and address latches, coupled to a second data port, are provided for storing data and address information. Each data port is coupled to a memory array. After an external memory access period, a cross-write circuit performs an internal cross-write operation by writing data into a second memory array in response to data previously written to a first memory array and stored in the first set of data and address latches, and writing data into a first memory array in response to data previously written to a second memory array and stored in the second set of data and address latches, wherein a redundant copy of data written to either the first or second memory arrays is created.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.