Method and Apparatus for Providing Hybrid Mode to Access SSD Drive

摘要

A system configuration containing a host, solid state drive (“SSD”), and controller able to perform a hybrid mode non-volatile memory (“NVM”) access is disclosed. Upon receiving a command with a logical block address (“LBA”) for accessing information stored in NVM, a secondary flash translation layer (“FTL”) index table is loaded to a first cache and entries in a third cache is searched to determine validity associated with stored FTL table. When the entries in the third cache are invalid, the FTL index table in the second cache is searched to identify valid FTL table entries. If the second cache contains invalid FTL index table, a new FTL index table is loaded from NVM to the second cache. The process subsequently loads at least a portion of FTL table indexed by the FTL index table in the third cache.

主权项

1. A digital processing system operable to store information, comprising:
a non-volatile memory (“NVM”) organized its memory space into memory blocks for storing data persistently, wherein the memory blocks are divided into a first region addressable by physical page addresses (“PPAs”) via a first access protocol and a second region addressable by logical block addresses (“LBAs”) via a second access protocol; an address mapping table situated in the NVM and organized to include a plurality of entries for accessing to the NVM, each entry of the address mapping table addressed to a physical page of NVM; and a memory controller having a random access memory (“RAM”) cache coupled to the NVM and configured to cache at least a portion of the address mapping table, an index table for indexing the address mapping table, and a secondary index table for indexing the index table.