UM1653 datasheet(17/45 Pages) STMICROELECTRONICS

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UM1653

NAND driver firmware modules

2.4

Bad block management

Bad blocks contain one or more invalid bits whose reliability is not guaranteed. They may be

present when the device is shipped, or may develop during the lifetime of the device.

Figure 8. Flow chart for bad block management

2.5

Look up table (LUT)

The LUT is used to find the Application Block Number corresponding to the Logical address

(SCSI_LBA). All blocks are scanned and User data is read from the Spare area of each

block of NAND Flash to build the LUT.

2.6

File system

The free file system used in the NAND library is FAT_FS_ELM from ChaN. The NAND file

system interface module “ff_user_interface.c” allows interfacing of file systems with the

NAND driver. In standalone mode it displays the .bmp images stored in the “pics” folder of

NAND Flash. This module should be ported to the selected file system.

Block address = Block 0

Start

Block

=FFh?

Yes

End

Update bad block table

Increment block address

MS33222V1

Last

block?

Yes

status

Table 3. File system interface functions

Function

Description

disk_initialize

Initialize disk drive.

disk_read

Interface function for a logical page read.

disk_write

Interface function for a logical page write.

disk_status

Interface function for testing if unit is ready.

disk_ioctl

Control device-dependent features.

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