| 摘要 |
PROBLEM TO BE SOLVED: To change each storage area in a memory to a power-saving mode while retaining data continuously located in a plurality of storage areas in the memory. SOLUTION: When data 41-44 stored in banks #1-#4 in an SDRAM 2 are used in a predetermined processing mode of CPU 11, a data transfer means 7 outputs a data address signal 17 for relocation of data to an access means 10 according to a relocation address signal 4 from a storage means 6. The access means 10 performs DMA transfer according to the data address signal 17, and collects the data 41-44 in the SDRAM 2 to a RAM 3. Further, according to a power-saving control signal 20, the four banks #1-#4 are changed to the power-saving mode. Thereafter, an address conversion means 9 converts the relocation address signal 4 to a converted address signal 21 every memory access from the CPU 11 according to the relocation address signal 4. COPYRIGHT: (C)2004,JPO&NCIPI
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