參數(shù)資料
型號(hào)： LC78628
廠商： Sanyo Electric Co.,Ltd.
元件分類(lèi)： 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)： 17/40頁(yè)
文件大?。?/td> 241K
代理商： LC78628
No. 6329-17/40
LC78628E
Track jump modes
The table lists the relationships between acceleration pulses (period a), deceleration pulses (period b), and the braking
period (period c).
Item
Previous track jump mode
New track jump mode
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 periods
233 μs
60 ms
0.5 track
jump periods
The same time
as a
60 ms
1 TRACK JUMP IN (OUT) #3
0.5 track
jump periods
233 μs
This period does
not exist.
0.5 track
jump periods
The same time
as a
This period does
not exist.
1 TRACK JUMP IN (OUT) #4
0.5 track
jump periods
233 μs
60 ms;
TOFF is low
during the C period.
0.5 track
jump periods
The same time
as a
60 ms;
TOFF is low
during the C period.
2 TRACK JUMP IN (OUT)
None
1 track
jump period
The same time
as a
60 ms
4 TRACK JUMP IN (OUT)
2 track
jump periods
466 μs
60 ms
2 track
jump periods
The same time
as a
60 ms
16 TRACK JUMP IN (OUT)
9 track
jump periods
7 track
jump periods
60 ms
9 track
jump periods
The same time
as a
60 ms
32 TRACK JUMP IN (OUT)
18 track
jump periods
14 track
jump periods
60 ms
18 track
jump periods
14 track
jump periods
60 ms
64 TRACK JUMP IN (OUT)
36 track
jump periods
28 track
jump periods
60 ms
36 track
jump periods
28 track
jump periods
60 ms
128 TRACK JUMP IN (OUT)
72 track
jump periods
56 track
jump periods
60 ms
72 track
jump periods
56 track
jump periods
60 ms
TOFF goes high during the period
when 256 tracks are passed over.
The a and b period pulses are not
output.
TOFF goes high during the period
when 256 tracks are passed over.
The a and b period pulses are not
output.
256 TRACK JUMP IN (OUT)
60 ms
60 ms
TRACK JUMP BRAKE
There are no a and b periods.
60 ms
There are no a and b periods.
60 ms
Notes: 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. If another track jump command is issued during a track jump operation, the track jump operation is immediately interrupted. Therefore, applications
must not issue a new command during a jump operation. However, port related commands and the HDCD register setting command can be used
by setting the PCCL pin.
4. The 1 TRACK JUMP #3 mode does 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.
5. Although there was no braking period (period c) for the 2 TRACK JUMP IN/OUT new track jump mode in the LC78620/21/25 products, in this IC
(the LC78628E) the braking period for this mode has been modified to be 60 ms.
相關(guān)PDF資料
PDF描述
LC78628E 16-bit fixed point DSP with Flash
LC78630 16-bit fixed point DSP with Flash
LC78630E 16-bit fixed point DSP with Flash
LC78631 16-bit fixed point DSP with Flash
LC78631E 16-bit fixed point DSP with Flash
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