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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM1653 датащи(PDF) 17 Page - STMicroelectronics |
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UM1653 датащи(HTML) 17 Page - STMicroelectronics |
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17 / 45 page  DocID025024 Rev 1 17/45 UM1653 NAND driver firmware modules 44 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 No End Update bad block table Increment block address MS33222V1 Last block? Yes No 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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