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AT91SAM9G25-EK

329

SAM9G25 [DATASHEET]

11032C–ATARM–25-Jan-13

27.4.2 MLC/SLC Read Page Operation using PMECC

27.4.2.1 MLC/SLC Read Operation with Spare Decoding

When the spare area is protected, the spare area contains valid data. As the redundancy may be
included in the middle of the information stream, the user programs the start address and the end
address of the ECC area. The controller will automatically skip the ECC area. This mode is entered
by writing one in the DATA field of the PMECC_CTRL register. When the page has been fully
retrieved from NAND, the ECC area is read using the user mode by writing one to the USER field of
the PMECC_CTRL register.

Figure 27-5. Read Operation with Spare Decoding

Table 27-3. Relevant Remainders Registers

BCH_ERR field

Sector size set to 512 bytes

Sector size set to 1024 bytes

PMECC_REM0

PMECC_REM0, PMECC_REM1

PMECC_REM0, PMECC_REM1,
PMECC_REM2, PMECC_REM3,

PMECC_REM0, PMECC_REM1,
PMECC_REM2, PMECC_REM3

PMECC_REM0, PMECC_REM1,
PMECC_REM2, PMECC_REM3,
PMECC_REM4, PMECC_REM5,
PMECC_REM6, PMECC_REM7

PMECC_REM0, PMECC_REM1,
PMECC_REM2, PMECC_REM3,
PMECC_REM4, PMECC_REM5,
PMECC_REM6, PMECC_REM7,
PMECC_REM8, PMECC_REM9,
PMECC_REM10, PMECC_REM11

Sector 0

512 or 1024 bytes

Sector 1

Sector 2

Sector 3

Spare

pagesize = n * sectorsize

sparesize

ecc_area

start_addr

end_addr

Remainder computation enable signal

Read NAND operation with SPAREEN set to One and AUTO set to Zero