2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
APC signal output for CLV servo control.
The output is a PWM (Pulse Width Modulation) wave with resolution
= 8 bits, carrier frequency = 8.27 kHz and linear output range = 8
' H / o v
AFC signal output for CLV servo control.
The output is a PWM wave with resolution = 8 bits, carrier frequen
—!/ 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.
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
D P - 1 1 0 0 B II