BU94605AKV Datasheet, PDF (44/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
Datasheet
20.5 File, Folder, CD Volume Information
The status of the CD file system analysis result is outputted by READ_CD_FOL and a READ_CD_FILE command.
If the 0th is specified by the READ_CD_FOL command, the volume information on CD will be outputted.
A file, a folder, and volume information status register structure are shown below.
Table 23. CD files information register structure
Status
OFFSET
The
number NAME
of bytes
0x38-0x39 2
Parent folder number
0x3A-0x3B 2
0x3C-0x3F 4
0x40-0x43 4
File number
File size
File LBN
Contents
A parent folder number is outputted.
A route becomes No. 1.
A file number is outputted.
File size is outputted.
LBN of the file head is outputted.
0x44
1
Extension type
An extension (file kind) is outputted.
0x01 : MP 3
0x02 : WMA
0x03-0x0E : Reserved
0x00 and 0x0F : Other files
0x45
1
0x46
1
0x47
1
0x48-0x77 48
Identifier length
-
Data length
File name
The identifier length (byte) recorded on DISC is outputted.
0x01
Data length is outputted.
A file name is outputted by left fitted.
Up to 48 bytes can be output.
A data type is outputted as BYTE.
Table 24. CD folder information register structure
Status
OFFSET
0x38-0x39
0x3A-0x3B
0x3C-0x3D
The
number
of bytes
2
2
2
NAME
The number
of subfolders
The number of
playable files
Parent folder
number
0x3E-0x3F 2
Folder number
0x40-0x43 4
Folder LBN
0x44
1
-
0x45
1
Identifier length
0x46
1
-
0x47
1
Data length
0x48-0x77 48
Folder name
Contents
The number of subfolders is outputted.
The number of playable files is outputted.
A parent folder number is outputted.
A route becomes No. 1.
The present folder number is outputted.
LBN of the folder head is outputted.
reserve
The identifier length (byte) recorded on DISC is outputted.
0x01
Data length is outputted.
A folder name is outputted by left stuffing.
Up to 48 bytes can be output.
A data type is outputted as BYTE.
Table 25. CD volume information register structure
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2012.12.10 Rev.002