15
SECTION 3
DIAGRAMS
3-1. IC PIN DESCRIPTIONS
• IC501 CXD2598Q (DIGITAL SERVO, DIGITAL SIGNAL PROCESSOR) (SERVO BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
DVDD
—
Digital power supply pin
2
DVSS
—
Digital ground
3
SOUT
O
Servo brock serial data output (Not used.)
4
SOCK
O
Servo brock serial data read clock output (Not used.)
5
XOLT
O
Servo brock serial data latch output (Not used.)
6
SQSO
O
Sub Q 80 bit, PCM peak and level data output. CD TEXT data output
7
SQCK
I
Clock input from SQSO read output.
8
SCSY
I
Fixed at “L”.
9
SBSO
O
Serial output of sub-P to W. (Not used.)
10
EXCK
I
Clock input from SBSO read output. (Fixed at “L”)
11
XRST
I
System reset (“L”: Reset)
12
STSM
I
System mute input (Fixed at “L”)
13
DATA
I
Serial data input from CPU.
14
XLAT
I
Latch input from CPU. Latch serial data at the falling edge.
15
CLOK
I
Serial data transfer clock input from CPU.
16
SENS
O
SENS output for CPU.
17
SCLK
I
Clock input from SENS serial data read.
18
ATSK
I/O
Input/output for anti-shock.
19
WFCK
O
WFCK (Write Flame Clock) output (Not used.)
20
XUGF
O
XUGF output (Not used.)
21
XPCK
O
XPCK output (Not used.)
22
GFS
O
GFS output
23
C2PO
O
C2PO output (Not used.)
24
SCOR
O
“H” output at either detection, sub code sync S0 or S1.
25
C4M
O
4.2336 MHz output (Not used.)
26
WDCK
O
Word clock input f=2Fs (Not used.)
27
COUT
I/O
Track number count signal input/output (Not used.)
28
MIRR
I/O
Mirror signal input/output (Not used.)
29
DVSS
—
Digital ground
30
DVDD
—
Digital power supply pin
31
DFCT
I/O
Diffect signal input/output (Not used.)
32
FOK
I/O
Focus OK signal output
I
External control input of spindle motor.
I/O
Lock signal input/output
O
Servo control output of spindle motor.
I
Disc most inner track detection signal input
I/O
2/3 frequency division output of pins
ih
and
ij
. (Not used.)
O
Sled drive output
O
Sled drive output
O
Tracking drive output
O
Tracking drive output
O
Focus drive output
43
FRDR
O
Focus drive output
44
DVDD
—
Digital power supply pin
45
DVSS
—
Digital ground
46
TEST
I
Test pin (Fixed at “L”)
47
TES1
I
Test pin (Fixed at “L”)
48
XTSL
I
X’tal select input (“L”: 16.9344 MHz, “H”: 33.8688 MHz)
49
VC
I
Center voltage input
50
FE
I
Focus error signal input
51
SE
I
Sled error signal input
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