BU94603KV Functional Specifications
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Confidential
Target Spec 0.12
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V.mp3
including those in the lower layers
within A_FOLDER, it moves to a folder
in the same layer as A_FOLDER to
search MP3 files.
· Since there is no MP3 file in
D_FOLDER, the layers same as
A_FOLDER, the master plays MP3 files
in E_FOLDER under that.
18
W.mp3
19
X.mp3
20
Y.mp3
21
Z.mp3
6.1.5 Search within multi-drive and multi-partition
If a device is a multi-drive type or multi partition type, the LSI can recognize the drive by selecting LUN
(Logical Unit Number) for the supporting FAT. (Only MODE2 and MODE3)
If particular LUN isn
’t selected, the LSI mounts the device whose LUN detected first. (default)
When the multi-card reader is connected, the LSI can recognize device which connected to the card-reader
by selecting LUN. But after the device is mounted, it
’s impossible to recognize states whether the device
connected to the card-reader is inserted or removed.
6.1.6 External HUB search
When the USB connector is connected to a HUB, and a FAT-supported drive is connected ahead of the HUB
at mounting the USB for this LSI, only one drive is recognized.
The LSI does not support external HUBs, it cannot detect plugging/unplugging of the drive ahead of the HUB
after the USB is mounted.
VI.2 MODE1
VI.2.1 KEY command operation
VI.2.1.1 KEY SCAN (Single Mode)
KEY SCAN operates in the following sequence on the circuit configuration as shown in Figure V.10 .
(1) KEY_COL1 to 3 output waveforms at timing as shown in Figure VI.2.1.
(2) By pressing KEY switch, KEY_ROW 1 to 4 are set to L at timing when KEY_COL 1 to 3 are L.
(3) When detecting L input from KEY_ROW 1 to 4 three times, the master judges that KEY has
been pressed. Then, the master starts the KEY operation.
figure VI.2.1 KEY SCAN Waveform.
Figure VI.2.2 Operating Waveforms when KEY is Pressed
PLAY
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_COL1
20ms
20ms
20ms
20ms
20ms
20ms
Determine that KEY is pressed
Start the operation of the pressed KEY.
420ns
420ns
420ns
20ms
KEY_COL1
KEY_COL2
KEY_COL3