Sharp MD-C2 Service Manual page 83

IC2 VHiLC78622N-1: Servo/Signal Control (LC78622NE) (2/2)
Terminal Name Input/Output
Pin No.
51 SBCK
52* FSX
53 WRQ
54 RWC
55 SQOUT
56 COIN
57 *CQCK
58 *RES
59* TST11
60* 16M
61 4.2M
62 TEST5
63 *CS
64 TEST1
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
DEFI
Slice level
control
EFMIN
Sync detection
FSEQ
EFM demodulation
CLV+
CLV
Digital servo
CLV-
V/P
PW
Subcode division
SBCK
QCRC
SBSY
SFSY
CS
µ COM
WRQ
Interface
SQOUT
CQCK
COIN
Servo commander
RWC
Input Clock input terminal to read subcode. Schmit input.
Output Output terminal of synchronous signal of 7.35kHz divided from quartz oscillation.
Output Output terminal to stand by output of subcode Q.
Input Input terminal of read/write. Schmit input.
Output Output terminal of subcode Q.
Input Command input terminal from microcomputer.
Input Clock input terminal to fetch command input, or pick up subcode from SQOUT. Schmit input.
Input Reset input terminal of LC78622. When turning on power, set it at "L".
Output Output terminal for test. Used in the open state ( "L" output as ordinary).
Output Output terminal of 16.9344MHz.
Output Output terminal of 4.2336Hz.
Input Input terminal for test. Pull-down resistor is integrated.
Input Chip selection input terminal. Pull-down resistor is integrated.
Input Input terminal for test. Pull-down resistor is integrated.
VCO colck oscillation
clock control
Flag processing of C1/C2
error detection and correction
General-use port
Figure 83 BLOCK DIAGRAM OF IC
Function
DEFI
TAI
PDO
VVss
ISET
VV
DD
FR
Vss
EFMO
EFMIN
TEST2
CLV+
CLV–
V/ P
*
HFL
TES
RAM address
2 K x 8 b i t
R A M generator
Interpolation mute
Bilingual
Digital
attenuator
X4 oversampling
digital filter
1 b i t D A C
L . P . F
XTAL system timing
generator
– 83 –
MD-C2
48
1
47
2
46
3
45
4
44
5
43
6
42
7
41
8
40
9
39
10
38
11
37
12
36
13
35
14
34
15
33
16
C2F
Digital OUT DOUT
(NC)
EFLG
SBSY
XVss
XIN
XOUT
XV
DD
MUTER/CONT8
RV
DD
RCHO
RVss
LVss
LCHO
LV
DD
MUTEL/CONT7
PCCL
TEST4