Page Layout Structure

The page layout structure is defined in the file File_Config.h as follows:

This structure contains basic configuration info:

• Pos_LSN
  Position in spare area, where logical sector number (LSN) is placed. Usually, this is the first byte of spare, therefore Pos_LSN has value zero. LSN is a 32-bit value.
• Pos_COR
  Position of data corrupted marker in spare area. Usually, this byte is the fifth byte of spare and Pos_COR has value four.
• Pos_BBM
  Position of bad block marker (BBM) in spare area and is usually placed as the sixth byte of spare, Pos_BBM has value 5.
• Pos_ECC
  Position of the first byte of Error Correction Code (ECC) bytes in the spare area. First ECC byte is default seventh byte of spare (Pos_ECC == 6). This value is used by flash translation layer only if ECC is encoded and decoded in software.
• SectInc
  Provides information about user data sector locations within page. If page contains multiple sectors, first sector always starts at the beginning of the page (byte zero). Second sector starts at SectInc, third sector at SectInc + SectInc and so on.
• SpareOfs
  Provides information about the location of the first spare area byte within page.
• SpareInc
  Provides information about spare area locations within page. If page contains multiple sectors, first byte of the first spare area is determined by reading SpareOfs value. Location of the first byte of the second spare, can be determined by adding SpareInc value to the SpareOfs value.

The default page data layout (defined by SectInc, SpareOfs and SpareInc values) contains a Spare area after each sector.

Default 16-byte spare area data organization (defined by Pos_LSN, Pos_BBM and Pos_ECC values):