Sharp CD-PC1881V Service Manual page 47

IC2 VHiLC78631E-1: Servo/Signal Control (LC78631E) (2/2)
Pin
Terminal Name Input/Output
No.
51 XVSS
52 XOUT
53 XIN
54 XVDD
55 RVSS
56 RCHN
57 RCHP
58* RVDD
59* MUTER
60* SBSY
61* EFLG
62* PW
63* SFSY
64 SBCK
65* DOUT
66* FSX
67 WRQ
68 RWC
69 SQOUT
70 COIN
71 CQCK
72 RES
73* FAST
74* CONT2
75 16M
76 4.2M
77 TEST5
78 CS
79 DEFI
80 VCOC
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Note: The same potential must be to the power terminals (VDD, VVDD, LVDD, RVDD, XVDD).
Unused input ports of general-purpose input/output ports (I/O) must be connected to 0V or set output port.
V/P 15
CLV+, 13
CLV
14
CLV-
FRAME
22 SYNCHRONOUB
FSEQ
PROTECTION
21
PCK
EFMO 9
PLL
EFMI
11
DEFI 79
2,
PD02,
PD01 3
FR, 5,
7
ISET
FAST 73
VARIABLE
VPDO 1
PITCHRO
VCOC 80
PKK
53 19,20 28,29 30,31 23,24,25 78,68
52
— Crystal osccillator garound. Normaly 0v.
Output 16.9344 MHz crystal oscillator connections. Use a 33.8688 MHz Crystal oscillator for quadspeed playback.
Input 16.9344 MHz crystal oscillator connections. Use a 33.8688 MHz Crystal oscillator for quadspeed playback.
— Crystal oscillator power supply.
—
Output
One-bit D/A
Output
converter pins
—
Output
Output Subcode block synchronization signal output.
Output C1 and C2 error correction state monitor.
Output Subcode P,Q,R,S,T,U and W output.
Output Subcode frame synchronization signal output. Falls when the subcode output goes to the standby state.
Input Subcode readout clock input. This is a Schmitt input.
Output Digital output.
Output Outputs a 7.35 kHz synchronization signal generated by dividing the crystal oscillator frequency.
Output Subcode Q outputstandby output.
Input Read/write control input.
Output Subcode Q output.
Input Input for commands from the control microprocessor.
Input Command input acousition clock. Also used as the SQOUT subcode readout clock input.
This is a Schmitt input.
Input Chip reset input. This pin must be set low temporary when power is first applled.
Output Not used
Output Output port.
Output 16.9344 MHz output. 33.8688 MHz output in 4x playback mode.
Output 4.2336 MHz output.
Input Test input. A pull-down resistor built in.
Input Chip select input. A pull-down resistor is built in.
Input Defect detection signal input.
Input Variable pitch VCO control input.
FAST
DETECT
TJ
COMMAND
I/F
70,71
Figure 47 BLOCK DIAGRAM OF IC
Function
Right channel ground. Normaly 0V.
Right channel N output.
Right channel P output.
Right channel power supply.
Right channel mute output.
ADDRESS
GENERATOR
DRAM
CIRC
EFM
(ECC)
DEMODULATION
SUB CODE
ANTI-SHOCK I/F
DEMODULATION
DOUT
64 60,62,63,67,69
65 32
– 47 –
DATA
COMPENSATION
MUTE
PQRT
D-ATT
DE EMPHASIS
DAC
DF
34,35,36
CD-PC1881V
66,
FSX,
61 EFLG
42,
LRSY,
43,
CK2,
44, ROMXA,
45
C2F
33, P5,
PO/DFCK
38
59 MUTER
RCHP,
56,
RCHN
57
LCHP,
48,
49 LCHN
MUTEL
46