Sony DSC-F55 / DSC-F55E (serv.man2) Service Manual ▷ View online
13
Power
ON
MS
Yes/No
MS
protect
DIR, FAT data readout
File List Table
creation
No MEMORY STICK
MEMORY STICK LOCKED
Format ERROR
DOS/V
FORMAT
CHECK
Release
input
Camera image readout
DRAM area A
JPEC compression
DRAM area B Æ C
Thumbnail creation
DRAM area B
MS file
capacity
Number of
files check
No MEMORY SPACE
No MEMORY SPACE
: Error message display
on LCD screen
on LCD screen
Filename creation
Referring File List Table
File List Table
Modify
JPG file
creating allocation
JPG file writing
DIR, FAT data readout
Fig. 3-1 Camera mode, flow chart
Camera Mode
14
3-1-4. Correspondence between Image Filename and Thumbnail File
The image filename has the structure as shown below.
1 DSC
: Still image
MOV
: Moving image
2 Serial number (00001 to 99999)
Whenever a new image is read, the serial number is incremented by
+1 over the maximum number to create a new number for a new
image.
When the serial number reaches “999999”, the number starts from
00001 and looks for an unused number.
+1 over the maximum number to create a new number for a new
image.
When the serial number reaches “999999”, the number starts from
00001 and looks for an unused number.
3 File extension
JPG
: Compressed data in conformity with the JPEG compres-
sion standard
MPG
: Compressed data in conformity with the MPEG compres-
sion standard
The thumb nail file is created inside the header of the JPEG file.
• Relation between the files and directories
DSC00001.jpg
¥
DCIM
MSSONY
100MSDCF
IMC1F100
MOMLV100
MOML0001
DSC00001.jpg
DSC00002.jpg
DSC00002.jpg
DSC00001.jpg
DSC00002.mpg
MOV00003.mpg
Main picture of
still image
still image
E-mail picture
Voice memo picture
Picture of moving
image
image
15
3-2. Picture Playback Mode Flow Chart
Flow chart in the playback mode is shown in Fig. 3-2. Operation in the
playback mode is described in the following order.
playback mode is described in the following order.
3-2-1. Checking the Memory Stick
When the main power is turned on, the HI Controller immediately reads
out the status of the MS in the same way as in the camera mode. (Don't
care on the write-protection of the MS because only reading out is used.)
out the status of the MS in the same way as in the camera mode. (Don't
care on the write-protection of the MS because only reading out is used.)
• Checking if MS is used or not ............................. NO MEMORY STICK
When an MS is found to be nonexistent, the alarm message “NO MEMORY
STICK” appears on the LCD screen.
Checking MS is performed only during initialization immediately after the
main power is turned on. The HI Controller does not start up even though
cause of the error content is removed. Turn off the main power once and
back on.
STICK” appears on the LCD screen.
Checking MS is performed only during initialization immediately after the
main power is turned on. The HI Controller does not start up even though
cause of the error content is removed. Turn off the main power once and
back on.
3-2-2. Reading the Contents of Memory Stick
The DIR data and the FAT data are read and the DOS/V format is checked.
If any data error is found, the message “FORMAT ERROR” appears.
If any data error is found, the message “FORMAT ERROR” appears.
3-2-3. Processing and Storing the Picture Data
When an MS is confirmed free from abnormality, the image file having the
maximum file number is searched from the memory, read and stored in
SDRAM in the playback mode.
maximum file number is searched from the memory, read and stored in
SDRAM in the playback mode.
DSC00001.jpg .......................................... Picture file
File number
Because the picture data is JPEG-compressed, the file is expanded, D/A
converted and decoded to the R. G. B. signals.
converted and decoded to the R. G. B. signals.
16
Image Playback Mode
Fig. 3-2 Image playback mode, flow chart
Power
ON
MS
Yes/No
DIR, FAT data readout
File List Table
creation
No MEMORY STICK
Format ERROR
DOS/V
FORMAT
CHECK
Searching the filename
having the maximum
serial number
Reading the size at the
starting position of the file
File readout
DRAM area
File top data,
FFDB check
FFDB check
JPEG file expansion
DRAM area
JPEG file expansion
DRAM area
Picture display
: Error message display
on LCD screen
on LCD screen
Selecting
a file
Index
display
Thumbnail file read out
Creating the correspondence
table with the File List Table
Thumbnail file transfer
N to N + 1
DRAM area B
→
D
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