Method and apparatus for production testing of self-refresh operations and a particular application to synchronous memory devices
US5450364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Jan 31, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for testing the self-refresh operation of a dynamic memory part are provided in which an oscillator (140) is coupled to a self-refresh counter (142). The self-refresh counter (142) causes a refresh row address counter (144) to generate row addresses for self-refresh cycles. The refresh row address counter (144) is coupled to a self-refresh control circuit (148). The self-refresh control circuit (148) is operable to generate a signal indicating completion of a self-refresh cycle. The refresh row address counter (144) is also coupled to a multiplexer (146). The multiplexer (146) outputs row addresses from either the refresh row address counter (144) or those supplied externally for rows to be refreshed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.