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Apparatus and methods for controlling refresh operations

專利號
US10867660B2
公開日期
2020-12-15
申請人
MICRON TECHNOLOGY, INC.（US ID Boise）
發(fā)明人
Hiroshi Akamatsu
IPC分類
G11C7/00; G11C11/408; G11C5/04; G11C5/06; G11C29/18; G11C29/00; G11C8/12
技術(shù)領(lǐng)域
word,row,address,rwlj,radd2,redundant,refresh,circuit,signal,target
地域： ID ID Boise

摘要

An apparatus includes a first word line, a second word line and a control. The second word line is contiguous to the first word line. The control circuit includes a first defective address storing circuit and a first detection circuit. The first defective address storing circuit stores first enable information along with first defective address. The first enable information indicates whether or not the second word line is functional. The first detection circuit provides a first signal when the first word line is accessed. The first signal indicates whether or not the second word line is functional. The control circuit activates the second word line when the first signal indicates that the second word line is functional and does not activate the second word line when the first signal indicates that the second word line is not functional.

說明書

Returning to FIG. 3, the row address RADD2 output from the selector 31 is input to an address detection circuit 35 and the boundary detection circuit 36. The least significant bit X0 of the row address RADD2 is supplied also to the usage detection circuit 37.

The address detection circuit 35 judges whether the row address RADD2 is indicating the address of the normal word line WL that has a defect or not. The boundary detection circuit 36 judges whether the row address RADD2 is indicating the address of the normal word line WLN positioned at the end of the normal-word-line area A1 or not. The usage detection circuit 37 is a circuit which judges whether the redundant word line RWL adjacent to the redundant word line RWL serving as the target of the target-row refresh is used or not.

FIG. 8 is a circuit diagram of the boundary detection circuit 36.

權(quán)利要求

1
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