Embedded auto-refresh circuit for pseudo static random access memory
US6269041A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 2000 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | May 3, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2207/104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An embedded auto-refresh circuit is provided to automatically refresh pseudo static random access memory cells. The embedded auto-refresh circuit includes a shift register and an auto-refresh generation circuit. The shift register is driven by a clock signal to perform shift operations. The auto-refresh generation circuit has a pre-charge and refresh signal generator driven by the clock signal to generate a refresh signal and a pre-charge signal. The pre-charge signal has a first pulse and a second pulse. In a memory access cycle, a plurality of memory cells on a word line determined by the refresh signal and the shift register are refreshed by a pseudo read operation based on the first pulse and the refresh signal, and then a general random memory access process is performed by taking the second pulse as a pre-charge signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.