Semiconductor memory device
US4456980A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor memory device comprises at least one word line, a plurality of bit lines extending across the word line, a data memory cell unit including a plurality of data memory cells connected between the word line and the bit lines for storing information, a plurality of first extra bit lines corresponding to first groups of the bit lines, each of which has k bit lines (k is an integer), and extending across the word line, a plurality of first extra memory cells connected between the word line and the first extra bit lines for storing first checking information with respect to the first groups of the bit lines, a plurality of second extra bit lines corresponding to second groups of the bit lines, each of which group has m bit lines (m is an integer), and extending across the word line, a plurality of second extra memory cells connected between the word line and the second extra bit lines for storing second checking information with respect to the second groups of the bit lines, an error detection circuit for comparing the information fed from the data memory cells with the contents of the first and second extra memory cells to detect errors, and a circuit responsive to an out…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.