Flash memory mass storage architecture

Details Flash memory mass storage architecture Flash memory mass storage architecture

G - Physics

11

C

G11C 7/00 (2006.01) G06F 3/06 (2006.01) G06F 12/02 (2006.01)

Patent

CA 2161344

A semiconductor mass storage sys- tem (100) and architecture can be substi- tuted for a rotating hard disk. The system and architecture avoid an eras cycle each time information stored in the mass stor- age is changed. Erase cycles are avoided by programming an altered data file into an empty mass storage block (step 202-206) rather than over itself as hard disk would. Periodically, the mass storage will need to be cleaned up (step 204). Secondly, means are provied for evenly using all blocks in the mass storage (Fig. 7). These advan- tages are achieved through the use of sev- eral flags (200), a map to correlate a logical address of a block to a physical address of tDat block (308, 408) aDd a count regis- ter for each block. ln particular, flags are provided for defective blocks (118), used blocks (112), old version of a block (104, 116), a count to determine the number of times a block has been erased and written and erase inhibit flag (200).

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