| 摘要 |
PURPOSE: A self refresh method is provided to reduce power consumption by eliminating a redundant refresh operation. CONSTITUTION: In the self refresh method, a global word line signal(GWL0) of low voltage is applied to a first bank(BANK0). While the global word line signal is applied, respective word line enable signals(WLEN0-WLENn) of high voltage are sequentially applied to refresh respective addresses. In other words, a refresh operation regarding all addresses is carried out by sequentially increasing an address after enabling a bank. Regarding the next bank(BANK1), when the word line enable signal(WLEN0) is applied to the first bank(BANK0), the global word line signal(GWL0) is applied. While the signal(GWL0) is applied, every word line enable signal(WLEN0-WLENn) is sequentially applied. Therefore, a memory cell of a specific address in a second bank can be refreshed.
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