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2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
Pin No.
Symbol
Pin name
Laser diode control out­
11
LDC
put
12
Dropout control output
DCON
13
PLAY
Play control output
14
FOKG
Focus OK output
15
MSP
Disc motor control output
TES polarity select input
16
TPCO
17
EFMI
EFM signal input
Tracking error generation
18
TS2
signal (1) input
Tracking error generation
19
TS1
signal (2) input
20
RFOK
RF signal OK input
21
GND
GND
RF envelope signal input
22
RFES
IN/OUT
0
Laser diode ON = " H " output, OFF = " L " output
Output which indicates the dropout position of the RF signal.
0
Control signal output which operates the PU motor by the PU tracking
0
servo signal.
Outputs the OK signal on instruction from the microprocessor when the
0
laser spot is focused.
Focus ON = " H " output.
0
Output for disc motor ON/OFF control signal.
Input for signal which selects the polarity of the TES signal used in the
I
kick process circuit.
Open ( V
) or connected to GND.
D D
Input for binary signal obtained by passing the RF signal regenerated by
I
the PU through a comparator.
Its polarity should be positive against the RF signal polarity.
Input for binary signal obtained from passing the A
I
4-division photodetector through zero-cross comparator. (Used in
tracking error generation.)
Input for binary signal obtained from passing the A
I
4-division photodetector through zero-cross comparator. (Used in
tracking error generation.)
Input for signal indicating the regeneration of the RF signal by the
I
pickup. It turns OFF the data slice (sub) and output EFMO. (At "H")
Input for RF presence/absence signal, this signal is obtained by passing
the RF envelope detection signal through comparator. It is used in the
I
kick process and dropout process sections.
T a b l e 2 - 2 A
Description
+ A
signal of
2
4
+ A
signal of
t
3
D P - 1 1 0 0 B II
Remarks
Pullup
resistor
incorporated
Pullup
resistor
incorporated
Pullup
resistor
incorporated
Pullup
resistor
incorporated
Pullup
resistor
incorporated
Pullup
resistor
incorporated

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