поискавой системы для электроныых деталей |
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EE-196 датащи(PDF) 3 Page - Analog Devices |
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EE-196 датащи(HTML) 3 Page - Analog Devices |
3 / 15 page a represents the size, in bits, of the entries in the actual FAT structure on the disk. There are 12 bits in a FAT12 FAT entry, 16 bits in a FAT16 FAT entry and 32 bits in a FAT32 FAT entry. Currently, this interface supports FAT16 only but other FAT systems could be implemented. There are 4 basic regions on a FAT volume: • Reserved Region • FAT Region • Root Directory Region (non FAT32) • File and Directory Data Region Disk Structure Sector Offset Boot Sector 0 FAT 1 1 FAT 2 (# of Sectors per FAT) + 1 Root Directory 2*(# of Sectors per FAT)+1 File Clusters (Data Region) 2*(# of Sectors per FAT)+1+(# of Root Directory Sectors) Table 2. Disk Structure Reserved Region The Reserved Region contains the Boot Sector which is the first sector of the volume. A summary of the FAT16 structure of the Boot Sector is provide below, starting with the first word at byte offset 0 (also applies to FAT12): The Boot Sector contains all the information about the physical structure of the CompactFlash. This information is needed to determine where data is stored on the CompactFlash for retrieval. Name Size (in bytes) Description JumpBoot 3 Jump Instruction to boot code. OEMName 8 Name string – MSWIN4.1. BytesPerSector 2 512, 1024, 2048, 4096. SectorsPerCluster 1 1, 2, 4, 8, 16, 32, 64, 128. ReservedSectors 2 1 for FAT12 and FAT16. FATCount 1 2 FAT data structures. RootEntCount 2 # of 32-byte entries in root directory. TotalSectors1 2 Total # of sectors on volume Bits[15:0]. MediaDescriptor 1 0xF8 for fixed media. 0xF0 for removable media. SectorsPerFAT 2 # of sectors in one FAT. SectorsPerTrack 2 Tracks are broken down into heads and cylinders. HeadCount 2 Relevant for previous field. HiddenSectors 4 Count of hidden sectors preceding FAT volume. TotalSectors2 4 Total # of sectors on volume Bits[47:16]. DriveNumber 1 This field is OS specific. Reserved 1 Reserved. BootSignature 1 Extended Boot Sig. (0x29). VolumeID 4 Volume serial number. VolumeLabel 11 Volume label. Reserved 8 Reserved. Table 3. Boot Sector FAT Region There are two FAT data structures on the volume. The reason there are two is to provide redundancy for the FAT data structure so that if a sector goes bad in one of the FATs, the data is not lost because it is duplicated in the other FAT. Each FAT is a single linked list of the clusters of a file. These clusters map to the data region of ADSP-BF535 Blackfin® EZ-KIT Lite™ CompactFlash® Interface (EE-196) Page 3 of 15 |
Аналогичный номер детали - EE-196 |
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Аналогичное описание - EE-196 |
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