BU9458KV Application Note Rev. 0.02
PROPRIETARY AND CONFIDENTIAL
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2009/05/28
5. Start playing
6. Read status/wait/receive operation command
After the LSI starts playing, read the status such as information on play time.
The LSI automatically waits to receive the set operation commands.
V.2.2 Power ON sequence
Control the power ON sequence in the same manner as in MODE1.(See V.1.1)
V.2.3 Recognize memory
V.2.3.1 Memory recognition operation flow
Figure V.2.2 shows the operation flow to recognize memory.
Figure V.2.2 Memory Recognition Operation Flow
V.2.3.2 Start recognizing memory
After the power ON sequence is normally completed, the LSI automatically starts recognizing memory.
V.2.3.3 Detect memory insertion state
The LSI detects the insertion state of the memory device only.
The LSI does this for both USB memory and SD memory. If there is no SD memory, an error occurs.
First, the LSI recognizes whether the USB device is inserted (for about 3 seconds, during which the LSI also recognizes
whether SD is inserted).
If the LSI cannot confirm insertion of the USB device but finds SD, it moves to the SD memory mount operation in 3
seconds.
1. Start recognizing memory
2. Detect memory insertion
state
3. USB memory mount
4. Search playable file
in USB memory
Error state
5. SD memory mount
6. Search playable file
in SD memory
7. Memory recognition completed
USB memory exists
Only SD memory exists
No memory device
Mount succeeded
Mount failed
Mount succeeded
Mount failed
Playable file exists
No playable file
Playable file exists
No playable file
