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EE-196 датащи(PDF) 3 Page - Analog Devices

номер детали EE-196
подробное описание детали  ADSP-BF535 Blackfin짰 EZ-KIT Lite??CompactFlash짰 Interface
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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EE-196 датащи(HTML) 3 Page - Analog Devices

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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


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