LC78626 Sanyo Semicon Device, LC78626 Datasheet - Page 17

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

(2) The TJ Command
When the track jump command is input to the servo command an acceleration pulse is generated (period a), following
which a deceleration pulse is generated (period b), after which the specific jump is completed after the brake period
(period c) elapses. In this break period the beam slip direction is detected through the TES and HFL inputs, and the
segment of the TES signal that propagates the internal slip is cut by TOFF. Moreover, by increasing the servo gain
using TGL, it is possible to lock onto the track that is the jump destination. In the JP pulse interval TOFF output
mode, TOFF is high during the interval when the JP pulse is generated.
* The TOFF pin is only low when the CLV mode is active when related to the disk control mode, and this terminal is
high during start, stop, and break control. Moreover, the TOFF pin can be turned on and off independently using
commands. However, the disk motor control is only enabled when the CLV mode is active.
Code
$A0
$A1
$1A
$5A
$1B
$1C
$1D
$1F
$0F
$8F
$8C
$11
$12
$31
$52
$10
$13
$14
$30
#15
$17
$19
$39
$18
$38
$16
$21
$20
(JP pulse period)
(Brake period)
JP pulse period TOFF output mode reset.
JP pulse period TOFF output mode.
The conventional track jump
1 TRACK JUMP OUT #1
1 TRACK JUMP OUT #2
1 TRACK JUMP OUT #3
1 TRACK JUMP OUT #4
128 TRACK JUMP OUT
16 TRACK JUMP OUT
32 TRACK JUMP OUT
64 TRACK JUMP OUT
TRACK JUMP BRAKE
1 TRACK JUMP IN #1
1 TRACK JUMP IN #2
1 TRACK JUMP IN #4
1 TRACk JUMP IN #3
128 TRACK JUMP IN
2 TRACK JUMP OUT
4 TRACK JUMP OUT
The new track jump.
16 TRACK JUMP IN
32 TRACK JUMP IN
64 TRACK JUMP IN
256 TRACK CHECK
2 TRACK JUMP IN
4 TRACK JUMP IN
COMMAND
TOFF
TON
LC78626E
RES = low
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