Invention Grant
- Patent Title: Precise tRCD measurement in a semiconductor memory device
- Patent Title (中): 半导体存储器件中精确的tRCD测量
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Application No.: US12489730Application Date: 2009-06-23
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Publication No.: US08089817B2Publication Date: 2012-01-03
- Inventor: Hideo Inaba
- Applicant: Hideo Inaba
- Applicant Address: JP Tokyo
- Assignee: Elpida Memory, Inc.
- Current Assignee: Elpida Memory, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Young & Thompson
- Priority: JP2008-163499 20080623
- Main IPC: G11C7/00
- IPC: G11C7/00 ; G11C8/00

Abstract:
A semiconductor memory device is operable in normal and test operation modes. At the test operation, in response to a first active command, a row address signal that is input from the outside is captured in the row decoder, and in response to a first write/read command, a column address signal input from the outside is captured in the column decoder. At this time, a word line and a bit line are not selected. Thereafter, in response to a second active command, a word line corresponding to the row address signal is selected in the row decoder, and, in response to a second write/read command, a bit line that corresponds to the column address signal is selected in the column decoder. The time period from the time at which the second read/write command is input to the time at which the second active command is input, is measured as tRCD.
Public/Granted literature
- US20090316508A1 PRECISE tRCD MEASUREMENT IN A SEMICONDUCTOR MEMORY DEVICE Public/Granted day:2009-12-24
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