BU94605AKV Datasheet, PDF (43/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
Datasheet
20. CD-ROM Decoder
When CD-ROM MODE of the system operation mode has been selected, this function is effective.
File system analysis and decoding of data are performed to 3 line serial input data from CD-ROM format.
CD-ROM ECC and the EDC function are supported.
20.1 Support File System
CD-ROM Mode1, Mode2 form1, and Mode2 form2 are supported.
The file system supports ISO9660 level 1 and 2. Remeo and Joliet extension are supported.
The folder class which can be searched support by 8 classes.
A folder name and a file name are acquirable to 48 bytes.
20.2 File system analysis
The number of entries that can be maintained in the buffer for the analysis becomes
3*(File_Number)+ 4*(Folder_Number)=1200.
It depends on the content of the composition of each CD-ROM.
It becomes a 266 files when number (Folder_Number) of folders is 100 and it becomes 366 entries in total (file or
folder).
The entry which was not able to be held to the buffer domain for analysis cannot be played after file system analysis.
The result of the file system analysis can be read by the status output.
20.3 Playable file
20.3.1 MP3 file format
This format supports MPEG Audio 1, 2, 2.5 and Layer 1, 2, 3.
It supports sample rates of 8 kHz, 16 kHz, 32 kHz, 11.025 kHz, 22.05 kHz, 44.1 kHz and , 12 kHz, 24 kHz and 48
kHz.
It supports bit rates of 8 to 320kbps and VBR (Variable Bit Rate).
20.3.2 WMA file format
This format supports WMA Ver.9 Standard.
It supports sample rates of 8 kHz, 16 kHz, 32 kHz, 11.025 kHz, 22.05 kHz, 44.1 kHz and 48 kHz.
It supports bit rates of 5 to 384kbps and VBR (Variable Bit Rate).
It does not support DRM.
It supports ASF files including audio streams only.
20.3.3 CD-ROM play
Data is required for the CD-ROM reproduction operation to be input so that the internal data buffer should not empty.
Therefore, when the data input from CD is not in time, and the internal data buffer empties, the music skip is
generated.
The voice is not output while the microcomputer from the SEEK demand interrupt to the input of the demanded data
is controlling the CD data input when fast-forwarding, rewinding by the CD-ROM playing.
20.4 SEEK request
The status of the LBN of required data is outputted when a file analysis start and file selection.
Furthermore, SEEK request interruption is outputted from an IRPTO terminal to a microcomputer at this time.
If a request sector is inputted, it will be automatic, connection operation will be performed and subsequent data will be
processed.
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TSZ02201-0V2V0E600090-1-2
2012.12.10 Rev.002