Patent ID: 7971007
Filing Date: 2011-06-28
Classification: G11C

Abstract:
1. A method for accessing a downgrade memory including a plurality of blocks, each block having a plurality of pages, and each page having a plurality of sectors, the downgrade memory having a plurality of non-accessible sectors, the method comprising the steps of: programming an initial write command to the blocks; generating status information by programming an initial read command to the blocks after the blocks have been written; marking at least one block as a special block having at least one of the non-accessible sectors in response to the status information for a follow-up accessing, wherein the status information indicates the at least one of the non-accessible sectors of the at least one block; parsing a write command corresponding to the at least one special block; selecting accessible sectors according to the status information; and programming the write command to the accessible sectors, wherein the write command comprises: