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LC78681KE-L View Datasheet(PDF) - SANYO -> Panasonic

Part NameLC78681KE-L SANYO
SANYO -> Panasonic SANYO
DescriptionDigital Signal Processor for Compact Disc Players
LC78681KE-L Datasheet PDF : 24 Pages
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LC78681KE, 78681KE-L
Track jump modes
The table lists the relationships between acceleration pulse output, deceleration pulse output, and the braking
period.
Command
Former track jump mode
a
b
c
New track jump mode
a
b
c
1 TRACK JUMP IN (OUT) #1 233 µs
233 µs
60 ms
233 µs
233 µs
60 ms
1 TRACK JUMP IN (OUT) #2 0.5-track jump
233 µs
60 ms
0.5-track jump
a period
60 ms
1 TRACK JUMP IN (OUT) #3 0.5-track jump
233 µs
Does not occur 0.5-track jump
a period
Does not occur
1 TRACK JUMP IN (OUT) #4 0.5-track jump
233 µs
60 ms,TOFF = low
during the c period 0.5-track jump
a period
60 ms,TOFF = low
during the c period
2 TRACK JUMP IN (OUT)
None
None
None
1-track jump
a period
Does not occur
4 TRACK JUMP IN (OUT)
2-track jump
466 µs
60 ms
2-track jump
a period
60 ms
16 TRACK JUMP IN (OUT) 9-track jump
7-track jump
60 ms
9-track jump
a period
60 ms
32 TRACK JUMP IN (OUT) 18-track jump
14-track jump
60 ms
18-track jump
14-track jump
60 ms
64 TRACK JUMP IN (OUT) 36-track jump
28-track jump
60 ms
36-track jump
28-track jump
60 ms
128 TRACK JUMP IN (OUT) 72-track jump
56-track jump
60 ms
72-track jump
56-track jump
60 ms
256 TRACK CHECK
TOFF goes high after 256 tracks are
jumped. The a and b pulses are not
output.
60 ms
TOFF goes high after 256 tracks are
jumped. The a and b pulses are not
output.
60 ms
TRACK JUMP BRAKE
There are no a and b periods.
60ms
There are no a and b periods.
60 ms
Note: 1. As indicated in the table, actuator signals are not output during the 256 TRACK CHECK function. This is a mode in which the TES signal is
counted in the tracking loop off state. Therefore, feed motor forwarding is required.
2. The servo command register is automatically reset after the track jump sequence (a, b, c) completes.
3. If another track jump command is issued during a track jump operation, the content of that new command will be executed starting immediately.
No. 4969-14/24
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Overview
The LC78681KE and LC78681KE-L are signal processing and servo control CMOS LSIs for compact disk players, laser disk players, CD-V, CD-I and similar applications. These products provide a rich set of signal processing functions, including demodulation of the EFM signal from the optical pickup, de-interleaving, error detection and correction, and digital filter functions that can contribute to end product cost reduction. These LSIs also process servo system commands sent from a control microprocessor. They can be directly interfaced to a serial input DAC (such as the Sanyo LC78835K or LC78855K) that provides built-in dedicated digital filters.

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