UM0851 datasheet(128/245 Pages) STMICROELECTRONICS

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Non-volatile memory device drivers

UM0851

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Doc ID 16604 Rev 2

nand_ctrl.tclr = 0x04;

/* Command Latch Low to Read Enable Low */

/* Call FSMC API */

fsmc_set_nand_control (bank, &nand_ctrl);

/* Fills the structure for Timing parameter */

nand_timing.data_bus_hiz_phase = 0x1;

/*timing from start of cycle and enable data

out bus (only for write mode). */

nand_timing.addr_hold_phase = 0x4;

/* Time from enable off and end of cycle.

(Both for read and write cycle)*/

nand_timing.wait_phase = 0x6;

/* Time from enable on to enable off for all

signals.(Both for read and write cycle)*/

nand_timing.addr_setup_phase = 0x0;

/*Time from address valid to enable off

activation. (Both for read and write cycle)*/

/* Call FSMC API */

fsmc_set_nand_timing (bank, FSMC_PC_NAND_COMMON_MEM_SPACE, &nand_timing);

Out-of-band (OOB) data

A NAND page consists of a number of data bytes (512 or 2048) plus a number of out-of-

band (OOB) bytes (16 or 64 respectively).

Only the data bytes are used for application data. The OOB bytes are used for:

●

Marking an erase block as bad (first or second page of erase block)

●

Storing ECC (error correction codes)

●

Storing file system specific information (JFFS2 or YAFFS)

OOB placement schemes are defined by a struct nand_ecclayout:

struct nand_ecclayout {

int

eccbytes;

The eccbytes member defines the number of ecc bytes per page.

int

eccpos[24];

The eccpos array holds the byte offsets in the spare area where the

ecc codes are placed.

int

oobfree[8][2];

The oobfree array defines the areas in the spare area which can be

used for automatic placement. The information is given in the

format {offset, size}. offset defines the start of the usable area,

size the length in bytes. More than one area can be defined. The

list is terminated by an {0, 0} entry.

};

The OOB layout for 512 page-size NAND Flash over SPEAr platform is as follows:

static struct nand_ecclayout spear_nand_oobinfo_512 = {

.eccbytes = 3,

.eccpos

= {2, 3, 4},

.oobfree = {{8, 8}}

};

The total number of OOB bytes for 512-byte data is 16. In OOB bytes, 3 bytes (at offset 2, 3

and 4) are for the ECC, 8 bytes (from offset 8 to 15) are free and used by file-system specific

information. One byte (at offset 5) is used for bad-block information.

OOB layout for 2048 page-size NAND Flash in the SPEAr platform is as follows:

static struct nand_ecclayout spear_nand_oobinfo_2048 = {

.eccbytes = 12,

.eccpos

= {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52},

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