LC78626 Sanyo Semicon Device, LC78626 Datasheet - Page 18

• Manufacturer Part Number: LC78626
• Description: DSP for Compact Disk Players
• Manufacturer: Sanyo Semicon Device

(3) The TJ Mode
* The 256 TRACK CHECK does not produce an actuator drive signal as shown in the table above, rather because the mode is such that the TES signal is
* When the track jump sequence (a, b, c) is completed, the servo command register is reset automatically.
* When a new command has been input when the track jump is in process, that command is executed at that instant.
* In the 1 TRACK JUMP #3 command there is no brake period (period c), but rather caution is warranted because it is necessary to generate the brake
* Although in the 2TRACK JUMP IN (OUT) of the new track jump mode the brake period (period c) did not exist for the LC78620E/21E/25E ICs, in this IC
1 TRACK JUMP IN (OUT) #1
1 TRACK JUMP IN (OUT) #2
1 TRACK JUMP IN (OUT) #3
1 TRACK JUMP IN (OUT) #4
2 TRACK JUMP IN (OUT)
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 JUMP IN (OUT)
TRACK JUMP BRAKE
counted when the tracking loop is off, it is necessary to provide a feed to the feed motor.
mode using an external circuit.
period C has been changed to 60 ms.
The relationships between the acceleration pulse, deceleration pulse, and brake interval are as shown in the table
below.
Command
TOFF is high during the period over
which 256 tracks elapse and pulses a
and b are not produced.
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
0.5 TRACK
0.5 TRACK
0.5 TRACK
18 TRACK
36 TRACK
72 TRACK
2 TRACK
9 TRACK
233 µs
There is no a or b period.
a
When in the conventional track jump mode
Slip detector
JUMP period
JUMP period
JUMP period
JUMP period
14 TRACK
28 TRACK
56 TRACK
7 TRACK
233 µs
233 µs
233 µs
233 µs
466 µs
None
High during the brake interval
b
LC78626E
60 ms TOFF =“L”
during period C
does not exist
This period
60 ms
60 ms
60 ms
60 ms
60 ms
60 ms
60 ms
60 ms
60 ms
c
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
JUMP period
0.5 TRACK
0.5 TRACK
0.5 TRACK
1 TRACK
2 TRACK
9 TRACK
a
When in the new track jump mode.
Same as in the conventional mode.
Same as in the conventional mode.
Same as in the conventional mode.
Same as in the conventional mode.
Same as in the conventional mode.
Same as in the conventional mode.
The same
The same
The same
The same
The same
The same
as for a
as for a
as for a
as for a
as for a
as for a
b
60 ms TOFF =“L”
during period C
does not exist
No. 5692-18/32
This period
60 ms
60 ms
60 ms
60 ms
c