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参数资料
| 型号： | LC78681E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | QFP-64 |
| 文件页数： | 6/23页 |
| 文件大小： | 241K |
| 代理商： | LC78681E |
3. Track Jump Modes
The relationship between acceleration pulses, deceleration pulses, and brake periods is shown in the following table.
Notes: 1. The actuator drive signals are not generated for the 256-track Check. Instead issuance of a feed motor signal is required because the TES signal
is in the track-count mode and the tracking servocontroller is off.
2. The servocontroller register is automatically reset after one a, b, and c track jump sequence.
3. When a new track jump command is issued while a previous command is still being processed, the new command is executed immediately.
4. Track Check Mode
A Track Count In or Track Count Out command followed by a binary number between 16 and 256 can be used to
start track counting for the specified number of tracks.
No. 4521-14/23
LC78681E
Standard track jump mode
New track jump mode
Command
a
b
c
a
b
c
1 TRACK JUMP IN (OUT) #1
233 s
24 ms
233 s
24 ms
1 TRACK JUMP IN (OUT) #2
0.5-track jump
233 s
24 ms
0.5-track jump
a period
24 ms
1 TRACK JUMP IN (OUT) #3
0.5-track jump
233 s
Does not occur
0.5-track jump
a period
Does not occur
2 TRACK JUMP IN (OUT)
There are no a, b, or c periods.
1-track jump
a period
Does not occur
4 TRACK JUMP IN (OUT)
2-track jump
466 s
24 ms
2-track jump
a period
24 ms
16 TRACK JUMP IN (OUT)
9-track jump
7-track jump
24 ms
9-track jump
a period
24 ms
32 TRACK JUMP IN (OUT)
18-track jump
14-track jump
24 ms
18-track jump
14-track jump
24 ms
64 TRACK JUMP IN (OUT)
36-track jump
28-track jump
24 ms
36-track jump
28-track jump
24 ms
128 TRACK JUMP IN (OUT)
72-track jump
56-track jump
24 ms
72-track jump
56-track jump
24 ms
TOFF goes high after 256 tracks are
256 TRACK CHECK
jumped. The a and b pulses are not
24 ms
jumped. The a and b pulses are not
24 ms
output.
TRACK JUMP BRAKE
There are no a or b periods.
24 ms
There are no a or b periods.
24 ms
MSB
LSB
Command
RES = low
1 1 1 1 0 0 0 0
Track Count In
1 1 1 1 1 0 0 0
Track Count Out
1 1 1 1 1 1 1 1
2-byte COMMAND RESET
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