參數(shù)資料
型號(hào)： LC78631E
廠商： Sanyo Electric Co.,Ltd.
元件分類： 數(shù)字信號(hào)處理
英文描述： 16-bit fixed point DSP with Flash
中文描述： 具有閃存的 16 位定點(diǎn) DSP
文件頁(yè)數(shù)： 15/34頁(yè)
文件大小： 503K
代理商： LC78631E
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 μs
233 μs
60 ms
233 μs
233 μs
60 ms
1 TRACK JUMP IN (OUT) #2
0.5 track
jump period
233 μs
60 ms
0.5 track
jump period
Same period as a
60 ms
1 TRACK JUMP IN (OUT) #3
0.5 track
jump period
233 μs
This period does
not exist.
0.5 track
jump period
Same period as a
This period does
not exist.
0.5 track
jump period
60 ms; TOFF is
low during
the C period.
0.5 track
jump period
60 ms; TOFF is
low during
the C period.
1 TRACK JUMP IN (OUT) #4
233 μs
Same period as a
2 TRACK JUMP IN (OUT)
None
None
None
1 track
jump period
Same period as a
This period does
not exist.
4 TRACK JUMP IN (OUT)
2 track
jump period
466 μs
60 ms
2 track
jump period
Same period as a
60 ms
16 TRACK JUMP IN (OUT)
9 track
jump period
7 track
jump period
60 ms
9 track
jump period
Same period as a
60 ms
32 TRACK JUMP IN (OUT)
18 track
jump period
14 track
jump period
60 ms
18 track
jump period
14 track
jump period
60 ms
64 TRACK JUMP IN (OUT)
36 track
jump period
28 track
jump period
60 ms
36 track
jump period
28 track
jump period
60 ms
128 TRACK JUMP IN (OUT)
72 track
jump period
56 track
jump period
60 ms
72 track
jump period
56 track
jump period
60 ms
TOFF goes high during the period
when 256 tracks are passed over.
The a and b pulses are not output.
TOFF goes high during the period
when 256 tracks are passed over.
The a and b pulses are not output.
256 TRACK CHECK
60 ms
60 ms
TRACK JUMP BRAKE
There are no a or b periods.
60ms
There are no a and b periods.
60 ms
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