Semiconductor memory device requiring refresh operation
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United States of America Patent
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May 14, 2013
Grant Date -
Jul 22, 2010
app pub date -
Jan 22, 2010
filing date -
Jan 22, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
To provide a plurality of memory banks, each of which is divided into a plurality of segments; a bank address register that designates a memory bank that becomes a refresh target; a segment address register that designates a segment that becomes a refresh target; and a refresh control circuit that prohibits a refresh operation of the memory bank or the segment not designated by at least one of the bank address register and the segment address register. This semiconductor device is capable of designating whether to perform a refresh operation not only in a memory bank unit but also in a segment unit within the memory bank, and thus it achieves a further reduction of the power consumption.
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