Static information storage and retrieval – Read/write circuit – Bad bit
Reexamination Certificate
2007-01-23
2007-01-23
Nguyen, Tuan T. (Department: 2824)
Static information storage and retrieval
Read/write circuit
Bad bit
C365S222000
Reexamination Certificate
active
11042441
ABSTRACT:
A dynamic semiconductor storage device in which the power supply current during the standby time is diminished to decrease the power consumption and to suppress the chip area from increasing. During the normal operation, the information as to a word line associated with a row address accessed during the normal operation is stored in a RAM. In entering self refresh, data of memory cells connected to a word line associated with a row address accessed during the normal operation time is read out and check bits for the data are appended in an encoder and written in a check bit area. As an initializing operation for the first self refresh entry after power up sequence, the data retention time of the memory cells is inspected every word line. Based on the results of inspection, the setting value of the refresh period of the word line is determined and written in the RAM to set the word line based refresh period. During error check for the refresh operation, any error is corrected by an error correction circuit.
REFERENCES:
patent: 5629898 (1997-05-01), Idei et al.
patent: 6697992 (2004-02-01), Ito et al.
patent: 6735726 (2004-05-01), Muranaka et al.
patent: 6795362 (2004-09-01), Nakai et al.
patent: 2005/0281112 (2005-12-01), Ito et al.
patent: 8-306184 (1996-11-01), None
patent: 2002-056671 (2002-02-01), None
Ito Yutaka
Riho Yoshiro
Elpida Memory Inc.
Foley & Lardner LLP
Nguyen Tuan T.
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