Sony FCB-ER8550 Technical Manual page 67

Chunk type
UDID
FDAT
DEND
Description
List of PID and VID corresponding to this unit to be updated in firmware
■ Limiting conditions
This necessarily exists as a chunk.
■ Data arrangement
Arrangement
UDID Chunk{
length
type
id_count
/* Descriptor ID List */
for ( i=0; i < id_count; i++ ){
PID
VID
Operating mode
reserved = 0
}
}
■ Meaning
id_count
This is the number of lists in the corresponding VID and PID.
PID
This is the corresponding PID.
VID
This is the corresponding VID.
Operating mode
This is information for identifying whether PID and VID are used during application operation of a main set or
during updater mode operation.
ID during application operation of a main set: 0x01
ID during updater operation:
Firmware data
■ Limiting conditions
This necessarily exists as a chunk.
■ Data arrangement
Arrangement
FDAT Chunk{
length
type
Firmware data
}
■ Meaning
Firmware data
Chunk indicating the termination of data
■ Limiting conditions
This necessarily exists as a chunk.
The data stream after this chunk is ignored.
■ Data arrangement
Arrangement
DEND Chunk{
length
type
CRC
}
■ Meaning
CRC
CRC32 value calculated for the data stream between Signature and the chunk just before a DEND chunk
Implementation: http://www.w3.org/TR/2003/REC-PNG-20031110/#D-CRCAppendix
Size [Byte]
4
4
4
2
2
1
3
0x02
Size [Byte] Type
4 uint
4 uint
length Binary
Size [Byte] Type
4
4
4

Type Value
uint 4+id_count*8
uint 'UDID'
uint
ID
ID
uint
uint 0x000000
Value
'FDAT'
Value
uint
uint 'DEND'
uint