| 摘要 |
PURPOSE: A self refresh apparatus and its method are provided to prevent an error of refresh rate by controlling an operation of a self refresh request signal selectively according to the type of PASR. CONSTITUTION: A command decoder(20) generates a corresponding command signal by decoding a command applied from the external. A refresh counter(30) outputs a refresh request signal by performing a counting appropriate for a refresh period, when a self refresh signal is enabled from the command decoder. A partial array self refresh decoder(40) decodes a preset address with an extended mode register set code according to a mode register set signal from the command decoder, and outputs a plurality of control signals to perform a partial array self refresh operation by assembling a corresponding address if the self refresh signal is enabled from the command decoder. A refresh control part(50) outputs a refresh operation signal to enable banks during the refresh operation and an internal operation signal to count an internal address. A row address strobe generation part(60,70,80,90) enables a bank selectively by outputting a row active signal. An internal address counter(100) generates an internal address when the internal operation signal is enabled. And a row address pre decoder(110) outputs an external address as a row address of a selected bank during a normal operation, and outputs the internal address as the row address during a refresh operation.
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