LC7861KE データシートの表示（PDF） - SANYO -> Panasonic

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LC7861KE

Digital Signal Processor for Compact Disc Players

SANYO -> Panasonic 

LC7861KE

Command

1 TRACK JUMP IN (OUT) #1

1 TRACK JUMP IN (OUT) #2

1 TRACK JUMP IN (OUT) #3

4 TRACK JUMP IN (OUT)

16 TRACK JUMP IN (OUT)

32 TRACK JUMP IN (OUT)

64 TRACK JUMP IN (OUT)

128 TRACK JUMP IN (OUT)

256 TRACK CHECK

TRACK JUMP BRAKE

Standard track jump mode

a

b

c

233 µs

233 µs

100 ms

0.5-track jump

233 µs

100 ms

0.5-track jump

233 µs

Does not occur

2-track jump

466 µs

100 ms

9-track jump

7-track jump

100 ms

18-track jump

14-track jump

100 ms

36-track jump

28-track jump

100 ms

72-track jump

56-track jump

100 ms

TOFF goes high after 256 tracks are

jumped. The a and b pulses are not

output.

100 ms

There are no a or b periods.

100ms

New track jump mode

a

b

c

233 µs

233 µs

100 ms

0.5-track jump

a period

100 ms

0.5-track jump

a period

Does not occur

2-track jump

a period

100 ms

9-track jump

a period

100 ms

18-track jump

14-track jump

100 ms

36-track jump

28-track jump

100 ms

72-track jump

56-track jump

100 ms

TOFF goes high after 256 tracks are

jumped. The a and b pulses are not

output.

100 ms

There are no a or b periods.

100 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.

4. The maximum braking time (period c) has been changed from the 17 ms of the earlier LC7861NE to 100 ms

in the LC7861KE.

11. Track counting circuit; Pin 16: HFL, pin 17: TES, pin 20: TOFF

MSB

LSB

11110000

11111000

11111111

10001100

Command

TRACK COUNT IN

TRACK COUNT OUT

TWO-BYTE COMMAND RESET

TRACK JUMP BRAKE

RES = low

o

The LC7861KE will count the specified number of tracks when the microprocessor sends an arbitrary binary value in

the range 16 to 254 after issuing either a track count in or a track count out command. The TOFF pin will output a

high level during the track count operation and the tracking loop will be turned off. Therefore, feed motor forwarding

is required.

No. 4818-12/18

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