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P - 1 1 0 0 B II
2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
Signal
Pin No.
Port name
name
22
P20
23
QDSE
P21
P2
P2
P2
P2
24
P22
QDAS
25
P23
QDARD
26
KOO
CLS/RFG
27
OPN/DOK
K01
KO
KO
KO
KO
28
K02
29
K03
RFOK
35
R80
36
R81
FSRH
R8
R8
R8
R8
37
R82
QDRE
38
TTAC
R83
39
R90
DAT21
40
R9
R9
R9
R91
DAT12
41
R92
SCK
21
30
TEST
-
-
-
-
-
31
32
Xoi/r
33
RESET
76
IN/OUT
Level
Read/write control signal to the external RAM IC14 (TC5514). ( " H " level in read mode and
R/W
0
H
" L " level in write mode)
Data input select signal to R7 port. (Data from the external RAM IC14 (TC5514) at " H "
0
H
level and the data input of the subcode Q from IC8 (TC-9178) at " L " level)
CRC error check data and subcode Q data select signal. (Error data at " L " level and Q-data
0
at " H " level)
A signal to read the subcode Q data from IC8 (TC-9178) in 4-bit units. (Data is updated at
0
L
" H " level. One cycle ends every 19 times.)
1 Tray close signal input ( " L " level with the tray closed)
*
I
2 Kick operation mode signal ( " L " level during the kick operation, and goes to " H " level
after the kick operation ends.)
1 Tray open signal ( " L " level with the tray opened)
I
2 Disc existence judge signal ( " L " level when a disc exists.)
Pickup position detect signal input ( " H " level when the pickup is positioned in the program
SLT
I
area and " L " level in the read-in area.)
*
I
RF signal input ( " L " level when RF signal exists.)
Data transfer request signal from IC1 (TMP47C41N)
IRQ
I/O
H
Usually " H " level and goes to " L " level when the request exists.
Focus search signal ( = 2 Hz)
0
L
Usually " L " level.
I
H
A signal to enable reading the subcode Q data from IC8 (TC-9178).
I
H
Kick end signal
1 Serial data input from IC1 (TMP47C41N)
I/O
L
2 A signal for controlling data transfer mode with IC1 (TMP47C41N). ( " H " level in
transmission mode from IC15 (TMP4740N) to IC1 (TMP47C41N))
I/O
H
Serial data output to IC1 (TMP47C41N).
I/O
H
Serial data transfer synchronizing signal
Power
Power supply (0 V)
v „
supply
I •
Not used (Connected to V
-
-
-
-
-
Oscillator connection terminal
I
0
Oscillator connection terminal
I
Initialize signal input
Function/operation
)
O T
T a b l e 2 - 3 - 1 A
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