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參數資料
| 型號： | LC78631E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁數： | 7/34頁 |
| 文件大小： | 502K |
| 代理商： | LC78631E |
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No. 5342-15/34
LC78631E
Track jump modes
The table lists the relationships between acceleration pulses (the a period), deceleration pulses (the b period), and
the braking period (the c period).
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 one cycle of the track jump sequence (a, b, c) completes.
3. A new track jump command cannot be input during a track jump operation.
4. The 1 TRACK JUMP #3 and 2 TRACK JUMP modes do not have a braking period (the c period). Since brake mode must be generated by an
external circuit, care is required when using this mode.
When the LC78631E is used in combination with a LA9230/40 Series LSI, since the THLD signal is generated by the LA9230/40 Series LSI, the
THLD pin (pin 25) will be unused, i.e., have no connection.
Old track jump mode
New track jump mode
Command
a
b
c
a
b
c
1 TRACK JUMP IN (OUT) #1
233 s
60 ms
233 s
60 ms
1 TRACK JUMP IN (OUT) #2
0.5 track
233 s
60 ms
0.5 track
Same period as a
60 ms
jump period
1 TRACK JUMP IN (OUT) #3
0.5 track
233 s
This period does
0.5 track
Same period as a
This period does
jump period
not exist.
jump period
not exist.
0.5 track
60 ms; TOFF is
0.5 track
60 ms; TOFF is
1 TRACK JUMP IN (OUT) #4
jump period
233 s
low during
jump period
Same period as a
low during
the C period.
2 TRACK JUMP IN (OUT)
None
1 track
Same period as a
This period does
jump period
not exist.
4 TRACK JUMP IN (OUT)
2 track
466 s
60 ms
2 track
Same period as a
60 ms
jump period
16 TRACK JUMP IN (OUT)
9 track
7 track
60 ms
9 track
Same period as a
60 ms
jump period
32 TRACK JUMP IN (OUT)
18 track
14 track
60 ms
18 track
14 track
60 ms
jump period
64 TRACK JUMP IN (OUT)
36 track
28 track
60 ms
36 track
28 track
60 ms
jump period
128 TRACK JUMP IN (OUT)
72 track
56 track
60 ms
72 track
56 track
60 ms
jump period
TOFF goes high during the period
256 TRACK CHECK
when 256 tracks are passed over.
60 ms
when 256 tracks are passed over.
60 ms
The a and b pulses are not output.
TRACK JUMP BRAKE
There are no a or b periods.
60ms
There are no a and b periods.
60 ms
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