Semiconductor memory device
AssigneeElpida Memory, Inc.
InventorHiromasa Noda
Life of this patent
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Abstract
A semiconductor memory device includes a row control circuit block and a column control circuit block each performing an access control over a memory cell array, a data I/O circuit block transmitting and receiving data to and from the memory cell array, and a control circuit changing at least a part of the row control circuit block, the column control circuit block, and the data I/O circuit block from a standby state into an active state in response to a setting of a predetermined mode signal to a mode register. According to the present invention, even if it is necessary to turn predetermined circuit blocks into the active state by an operation other than a read or write operation, there is no need to always set these circuit blocks into the active state.
Claims8
A method for a semiconductor memory device which comprises a memory cell array, an address control circuit block configured to perform an access control to the memory cell array, a data I/O circuit block configured to transmit and receive data to and from the memory cell array, and a mode register, the method comprising:
- setting first mode information into the mode register;
- deactivating each of the address control circuit block and the data I/O circuit block in response to the first mode information;
- changing a content of the mode register from the first mode information to second mode information;
- and
- activating one of the address control circuit block and the data I/O circuit block while keeping the other of the address control circuit block and the data I/O circuit block deactivated in response to the second mode information.
Dependencies are inferred from the claim text.