Method for refreshing a memory, controlled by a memory controlle

Details Method for refreshing a memory, controlled by a memory controlle Method for refreshing a memory, controlled by a memory controlle

1996-10-10

1998-05-19

Nguyen, Hoa T.

Excavating

371 221, 39518306, G01R 3128

Patent

active

057545570

ABSTRACT:
A method and system for preserving the state of memory while a memory subsystem is scan tested. In certain situations, it is desirable to scan test a memory subsystem. Scan testing is accomplished by causing the registers in a memory controller to form at least one ring. Then, register values are shifted through the ring and analyzed. Clocks within the memory controller must be stopped before scan testing can be conducted. Accordingly, the memory controller is unable to provide refresh requests to the memory during testing. Therefore, the memory controller places the memory in a self-refresh mode during scanning. While in the self-refresh mode, the memory automatically refreshes itself but does not respond to read or write requests. Once scanning is completed, the memory controller takes the memory out of self-refresh mode.

REFERENCES:
patent: 4827476 (1989-05-01), Garcia
patent: 5109382 (1992-04-01), Fukunaka
patent: 5625597 (1997-04-01), Hirose

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