FCB-ER8550/CR8550(GB) D-201-100-12(1)
67
Chunk type Description
UDID 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 Size [Byte] Type Value
UDID Chunk{
length
4 uint 4+id_count*8
type
4 uint 'UDID'
id_count
4 uint
/* Descriptor ID List */
for ( i=0; i < id_count; i++ ){
PID
2 ID
VID
2 ID
Operating mode
1 uint
reserved = 0
3 uint 0x000000
}
}
■ 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: 0x02
FDAT Firmware data
■ Limiting conditions
This necessarily exists as a chunk.
■ Data arrangement
Arrangement Size [Byte] Type Value
FDAT Chunk{
length
4 uint
type
4 uint 'FDAT'
Firmware data
length Binary
}
■ Meaning
Firmware data
DEND 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 Size [Byte] Type Value
DEND Chunk{
length
4 uint
type
4 uint 'DEND'
CRC
4 uint
}
■ 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
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