| 摘要 |
PROBLEM TO BE SOLVED: To disclose a method and device for using a SDRAM circuit, a module, and a memory system with a multi-bank. SOLUTION: As one embodiment, the SDRAM circuit receives a bank address for an automatic refresh operation, and executes the automatic refresh operation to a specific bank and a present refresh row. If the automatic refresh of all banks is treated to the present row, the SDRAM circuit updates the present refresh row and repeats a process mentioned above. In such a process, if required, a memory controller changes automatic refresh bank order, while the automatic refresh operation is executed on arbitrary memory banks, a read and write operation are enabled in other memory banks. Therefore, the degree of utilizing the SDRAM circuit can be further increased. Moreover, other embodiments are described and claimed. COPYRIGHT: (C)2006,JPO&NCIPI
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