Philips AZ 7383, Service Manual

Page: 13 / 31

SAA7374 – DECODER AND DIGITAL SERVO IC CD7 (low voltage version)
Pin Name Direction Description
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1 VSSA1 GND supply (analog) of CD7
2 VDDA1 +C supply (analog) of CD7
3 D1 HF-preamp
→
CD7 unipolar current input (central diode signal input)
4 D2 HF-preamp
→
CD7 unipolar current input (central diode signal input)
5 D3 HF-preamp
→
CD7 unipolar current input (central diode signal input)
6 VRL GND reference input for ADC
7 D4 HF-preamp
→
CD7 unipolar current input (central diode signal input)
8 R1 HF-preamp
→
CD7 unipolar current input (satellite diode signal input)
9 R2 HF-preamp
→
CD7 unipolar current input (satellite diode signal input)
10 IREFT
→
CD7 current reference for calibration ADC
11 VRH reference output from ADC
12 VSSA2 GND supply (analog) of CD7
13 SELPLL +C selects whether internal clock multiplier PLL is used
14 ISLICE CD7
→
current feedback from data slicer
15 HFIN
→
CD7 comparator signal input
16 VSSA3 GND supply (analog) of CD7
17 HFREF
→
CD7 comparator common mode input
18 IREF
→
CD7 reference current pin (nom. VDD/2)
19 VDDA2 +C supply (analog) of CD7
20 TEST1 GND test control input
21 CRIN µP
→
CD7 crystal/resonator input
22 CDOUT CD7
→
crystal/resonator output
23 TEST2 GND test control input
24 CL16 CD7
→
16.9344MHz system clock output
25 CL11 CD7
→
11.2896MHz or 5.6448MHz clock output (3-state)
26 RA CD7
→
servo driver radial actuator output
27 FO CD7
→
servo driver focus actuator output
28 SL CD7
→
servo driver slide actuator output
29 TEST3 GND test control input
30 VDD1P +C supply (digital) of CD7
31 DOBM CD7
→
bi-phase mark output (3-state)
32 VSS1 GND supply (digital) of CD7
33 MOTO1 CD7
→
motor output1 of CD7; versatile (3-state)
34 MOTO2 CD7
→
motor output2 of CD7; versatile (3-state)
35 SBSY CD7
→
NPC subcode block sync (3-state)
36 SFSY CD7
→
µP subcode frame sync (3-state)
37 RCK
→
CD7 subcode clock input
38 SUB CD7
→
P to W subcode bits (3-state)
39 VSS2 GND supply (digital) of CD7
40 V5 CD7
→
versatile output pin of CD7
41 V4 CD7
→
versatile output pin of CD7
42 V3 CD7
→
versatile output pin of CD7 (open drain)
43 KILL CD7
→
kill output; programmable (open drain)
44 MISC CD7
→
NPC C2 error flag; output only defined in CD-ROM modes (3-state)
45 DATA CD7
→
NPC serial data output (3-state)
46 WCLK CD7
→
NPC word clock output (3-state)
47 VDD2P +C supply (digital) of CD7
48 SCLK CD7
→
NPC serial bit clock output (3-state)
49 VSS3 GND supply (digital) of CD7
50 CL4 CD7
→
4.2336MHz µP clock output
51 SDA µP
↔
CD7 µP interface data I/O line (open drain output)
52 SCL µP
→
CD7 µP interface clock line
53 RAB µP
→
CD7 µP interface R/W and load control line
54 SILD µP
→
CD7 µP interface R/W and load control line
55 NC no connection
56 VSS4 GND supply (digital) of CD7
57 RESET µP
→
CD7 power-on reset input (active low)
58 STATUS CD7
→
µP servo interrupt request line/CD7 status register output (open drain)
59 VDD3C +C supply core (digital)
60 C2FAIL CD7
→
indication of correction failure (open drain)
61 CFLG CD7
→
correction flag output (open drain)
62 V1
→
CD7 versatile input pin
63 V2
→
CD7 versatile input pin
64 LDON CD7
→
HF-preamp laser drive on output (open drain)
3-6
CS 46 467