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2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
Pin No.
Symbol
I/O
(I
19
APCO
0
XJ—
(||
20
AFCO
0
21
P/S
I
22
22
22
SCSE
SCSE
SCSE
I
I
I
SC P/T
SC Q/U
0
23-26
SC R/V
SC S/W
-
27
-
28
v „
29
S
Sj
0
0
30
SCPD
0
31
PFCK
0
Waveform
APC signal output for CLV servo control.
50
f)
The output is a PWM (Pulse Width Modulation) wave with resolution
0
s
n -
= 8 bits, carrier frequency = 8.27 kHz and linear output range = 8
1
' H / o v
TT/9.
AFC signal output for CLV servo control.
I)
j~l|-
50 /"S
The output is a PWM wave with resolution = 8 bits, carrier frequen­
l L
—!/ o v
cy = 8.27 kHz and linear output range = ± 1 0 % .
CLV servo control signal ON/OFF input. At play, this pin is set to " H "
and, at stop, to " L " . This input signal is given the highest priority in
" H "
the CLV servo control system. When this pin is " L " , AFC output is
fixed to " L " , and APC output gets duty ratio of 50.
Data selection input for 4 outputs of sub-code signal SCT/T - S/W
-
-
-
| " L " level: Data of 4 bits, P, Q, R and S is output. |
" H " level: Data of 4 bits T, U, V and W is output.
8-bit data output of sub-code signal P, Q, R, S, T, U, V, W. This
signal is the data of each frame. Here, 4-bit data is output by signal
-
SCSE as required. Data selection of each frame is performed in syn­
chronization with the rising edge of signal PFCK.
-
Voltage supply pin.
-
GND pin
When sub-code signal pattern SO or S1 is detected, this output
-
becomes " H " for that input frame period.
Output to indicate the date contents of sub-code signal P. Data ob­
-
tained when the data of each frame is checked in units of 5 frames by
the sub-code signal P detection section is output.
The frame period output with duty ratio of 50.
-
The sub-code data is switched in synchronization with the falling
edge of this output.
T a b l e 2 - 3 - 3 A
Description
D P - 1 1 0 0 B II
Remarks
-
Not connected
Not connected
Not connected
Not connected
85

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