BU9458KV Application Note Rev. 0.02
PROPRIETARY AND CONFIDENTIAL
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18/42-
2009/05/28
V.2.3.4 USB memory mount
After detecting insertion of USB memory, the LSI recognizes whether it is a connectable USB memory.
The LSI recognizes USB memory for 30 seconds at maximum. After 30 seconds have passed, an error occurs.
If the LSI fails to mount, an error occurs. Then, it goes to the command waiting state. If this happens, control
software allows the LSI to automatically send the CHNG_DEV command to the SD memory and move to recognition of
the SD memory.
V.2.3.5 Search USB memory playable file
When succeeding in mounting the USB memory, the LSI automatically searches playable files within the USB memory.
Playable files should follow the setting of the SEL_AAC/WMA/MP3 terminal port.
If there is no playable file, an error occurs. Then, the LSI is put in the command waiting state. If this happens, control
software allows the LSI to automatically send the CHNG_DEV command to the SD memory and move to recognition of
the SD memory.
CHNG_DEV command
V.2.3.6 SD memory mount
After detecting insertion of the SD memory, the LSI recognizes whether the SD memory is connectable.
As is the case for the USB memory, the LSI recognizes the SD memory for 30 seconds at maximum. After 30 seconds
have passed, an error occurs.
If the LSI fails to mount, an error occurs. Then, the LSI is put in the command waiting state.
V.2.3.7 Search SD memory playable file
When succeeding in mounting the SD memory, the LSI automatically searches playable files within the SD memory.
Playable files should follow the setting of the SEL_AAC/WMA/MP3 terminal port.
If there is no playable file, an error occurs. Then, the LSI is put in the command waiting state.
V.2.3.8 Memory recognition completed
When a playable file exists either in the USB memory or SD memory, the LSI terminates memory recognition and is put
in the command waiting state.
1st Byte
2nd Byte
0x50 0x08
CHNG_DEV
