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Flash memory controller which assigns address and sends assigned address to host in connection with data write requests for use in issuing later read requests for the data
Flash memory controller which assigns address and sends assigned address to host in connection with data write requests for use in issuing later read requests for the data
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机译:闪存控制器分配地址并将分配的地址发送到主机与数据写入请求相关,以用于为数据读取稍后的读取请求
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摘要
This disclosure provides for host-controller cooperation in managing NAND flash memory. The controller maintains information for each erase unit which tracks memory usage. This information assists the host in making decisions about specific operations, for example, initiating garbage collection, space reclamation, wear leveling or other operations. For example, metadata can be provided to the host identifying whether each page of an erase unit has been released, and the host can specifically then command each of consolidation and erase using direct addressing. By redefining host-controller responsibilities in this manner, much of the overhead association with FTL functions can be substantially removed from the memory controller, with the host directly specifying physical addresses. This reduces performance unpredictability and overhead, thereby facilitating integration of solid state drives (SSDs) with other forms of storage. The disclosed techniques are especially useful for direct-attached and/or network-attached storage.
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