Invention Grant
- Patent Title: Semiconductor memory device having auto-precharge function
- Patent Title (中): 具有自动预充电功能的半导体存储器件
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Application No.: US12647277Application Date: 2009-12-24
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Publication No.: US08120978B2Publication Date: 2012-02-21
- Inventor: Koji Kuroki
- Applicant: Koji Kuroki
- Applicant Address: JP Tokyo
- Assignee: Elpida Memory, Inc.
- Current Assignee: Elpida Memory, Inc.
- Current Assignee Address: JP Tokyo
- Agency: McDermott Will & Emery LLP
- Priority: JP2008-329252 20081225
- Main IPC: G11C7/00
- IPC: G11C7/00

Abstract:
To provide a semiconductor memory device including: a first clock generation circuit and a second clock generation circuit that generate a first internal clock and a second internal clock, respectively; a latency counter that counts latency synchronously with the first internal clock; and a recovery counter that counts a write recovery period synchronously with the second internal clock. The second clock generation circuit activates the second internal clock when auto-precharge is designated, and deactivates the second internal clock when the auto-precharge is not designated. With this configuration, the recovery counter does not perform any counting operation when an auto-precharge function is not operated, and thus unnecessary power consumption can be prevented.
Public/Granted literature
- US20100165769A1 SEMICONDUCTOR MEMORY DEVICE HAVING AUTO-PRECHARGE FUNCTION Public/Granted day:2010-07-01
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