| 摘要 |
To reduce the mean access time to storage blocks in CCD storage, a block which is most likely to be accessed next is detected after each access. While the accessed block is being processed, a selected block is moved at the high cyclic speed of the CCD storage to a shift position, and the CCD storage is then switched to the low speed. The distance of the shift position from a read/write position is such that it can be covered by the selected block at low speed within the mean time between two accesses to the CCD storage. At the time of the next access, the selected block is very likely to be close to the read/write position. In systems with virtual addressing, the block with the next virtual address would be the selected block. In other layouts, the access sequences to the CCD blocks are stored and are subsequently used to select the block which is most likely to be accessed next. |
