Methods for accessing a storage unit of a flash memory and apparatuses using the same

摘要

An embodiment of a method for accessing a storage unit of a flash memory, performed by a control unit, is disclosed to include at least the following steps. A transaction is appended to a bad-column table each time a bad column of a block within the storage unit is inspected. It is determined whether a total number of the transactions within the bad-column table is odd when the control unit determines that the last column of the block is a regular column. A transaction is appended to the bad-column table to indicate that the last column of the block is a bad column when the control unit determines that the total number of the transactions within the bad-column table is odd.

主权项

1. A method for accessing a storage unit of a flash memory, performed by a control unit, comprising:
appending a transaction to a bad-column table each time a bad column of a block within the storage unit is inspected; determining whether a total number of transactions within the bad-column table is odd when determining that a last column of the block is a regular column; appending a transaction to the bad-column table to indicate that the last column of the block is a bad column when determining that the total number of transactions within the bad-column table is odd; appending no transaction to the bad-column table when determining that the total number of transactions within the bad-column table is even; reading out designated data through a storage-unit access interface after receiving a data-read request through a processing-unit access interface; dropping bits of columns according to the transactions within the bad-column table; and replying with cleaned data through the processing-unit access interface.