Semiconductor memory device having a refresh operation
First Claim
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1. A semiconductor memory device, comprising:
- memory blocks, each comprising memory cells; and
word lines provided for selecting said memory cells, wherein, while the memory cells selected by the word line are being refreshed, said device accepts a command sent for the memory block including said word line, interrupts a refresh operation of said memory cells selected by said word line, saves data of said memory cells which are being refreshed into a register, then executes the command, and, then, restarts the refresh operation of said memory cells selected by said word line.
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Abstract
A semiconductor memory device, such as a DRAM, which needs to be refreshed for retaining data, is provided with a storing portion for storing data therein, and a busy signal outputting portion outputting a busy signal during the refresh operation.
46 Citations
7 Claims
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1. A semiconductor memory device, comprising:
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memory blocks, each comprising memory cells; and
word lines provided for selecting said memory cells, wherein, while the memory cells selected by the word line are being refreshed, said device accepts a command sent for the memory block including said word line, interrupts a refresh operation of said memory cells selected by said word line, saves data of said memory cells which are being refreshed into a register, then executes the command, and, then, restarts the refresh operation of said memory cells selected by said word line.
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2. A semiconductor memory device, comprising:
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memory blocks, each comprising memory cells; and
word lines provided for selecting said memory cells, a register in which the data of the memory cells which are being refreshed is saved; and
a transfer gate which causes data to be transferred to said register, wherein, while the memory cells selected by the word line are being refreshed, said device accepts a command sent for the memory block including said word line, interrupts a refresh operation of said memory cells selected by said word line, executes the command, and, then, restarts the refresh operation of said memory cells selected by said word line and;
wherein execution of the command is performed after the data of said memory cells which is being refreshed is saved in said register via said transfer gate, and, when the refresh operation is restarted, the data is returned from said register. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification