| 摘要 |
A 32-bit data bus (18) is used to transfer data between a memory control block (15), an error correction block (16) and a host I/F block (17), while a 64-bit memory data bus (19) is used to transfer data between a buffer memory (12) and the memory control block (15). The buffer memory (12) is accessed for 64 bits at a time, and each of the blocks process 32 bits at a time. As a result, 32-bit data transmitted on the data bus (18) between blocks are always effective, and the access speed from each block in the system to the buffer memory (12) increases.
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