®
IC4 RH-iX1812UFZZ (ZC99698P)
Pin
Terminal
I/o
Description
No.
Name
1
RESET
I Reset input
2
IRO
I
Power on: Microcomputer initial input
3*
NC
-
No operation
4 DaDS
0 Subcode data, OK = "H", NG = "L"
5 Si/RD
I/o
Focus servo start input/focus servo
READY output
6 SWAB/SSM
0 Spin motor control signal
7-10
B3-BO
0 Radial servo control output
11 REin
0
Radial error output
12 ORA
I/o
0 data request output
"l"/O
data
acknowledge input
13
OCl
0
When ORA is in
"l"
level: Data
clock
output
14 ODA
I
O data input
15
1
2
C
0
Display data,
clock
output
16 MUTE
0
MUTE indication output to SAA7310
17 MUSB
0 MUTE output
18*
ATSB
-
Digital
filter
control signal output
19*
CD ROM SW Digital
filter
control signal output
20 VSS
-
Ground
Pin
Terminal
I/o
Description
No.
Name
21 TRY 0
TRY STOP: 2.5V, TRY-OPEN: OV,TRY-
CLOSE: 5V
22*
EN
-
No operation
23
-
0 Power on: Microcomputer initial output
24
1
2D
0
Display data output
25-28
KBSC3-
I/o
Key matrix
KBSC5
29
-
-
No operation
30
- -
No operation
31 MC
I Spin motor control pulse input
32 KBSC5
I/o
Key matrix
33
TRYSW
I
Tray SW input
34
REdig
I
Radial error input
35
TCMP
0
8-cm
disc playback: "H"
36
Tl
I
Tracking loss input
37*
TCAP I Tracking loss input
38
XTAl2
0
Clock output
39 XTAL1
I
Clock input
40
Vcc
-
Power terminal
In this unit, the terminal
with
asterisked mark
(*)
is (open)
terminal
which
is not connected to the outside.
-56-