| 摘要 |
<p>A memory device comprises a controller (14) coupled to a host (12) and a nonvolatile memory unit (16) for controlling reading and writing information organized in sectors (34, 36) from and to the nonvolatile memory unit (16), as commanded by the host (12). The controller (14) maintains mapping of the sector information in an LUT stored in volatile memory the contents of which are lost if power is lost. Through the use of an address value and flag information maintained within each of the blocks of the nonvolatile memory unit (16), a block is re-written using a different number of write operation in various alternative embodiments of the present invention. The flag information is indicative of the status of the block such that during power-up, the controller (14) reads the address value and the flag information of a block and determines the status of the block and in accordance therewith finishes re-writing of the block, if necessary and updates the LUT accordingly.</p> |
