8
DQ4 Data bus
I/O
1.5
35
MA11 Address bus
I
0.04
9
VDDQ 3.3V power supply
3.18
36
NC
Blank pin
0.01
10
DQ5 Data bus
I/O
0.7
37
CKE Clock enable signal
I
1.22
11
DQ6 Data bus
I/O
0.45
38
CLK System clock input
I
1.68
12
VSSQ Ground
0
39
UDQM Data in/out screen-shielded signal
I
2.42
13
DQ7 Data bus
I/O
0.8
40
NC
Blank pin
0.01
14
VDD 3.3V power supply
3.14
41
VSS Ground
0.01
15
LDQM Data in/out screen-shielded signal
I
2.46
42
DQ8 Data bus
I/O
0.6
16
WE Write control signal
I
3.17
43
VDDQ 3.3V power supply
3.19
17
CAS Line address gatig signal
I
3.01
44
DQ9 Data bus
I/O
0.91
18
RAS Row address gating signal
I
3.13
45
DQ10 Data bus
I/O
0.8
19
CS
Chip selection signal
I
2.95
46
VSSQ Ground
0.01
20 SD-BS0 Section address 0 gating signal
I
1.8
47
DQ11 Data bus
I/O
0.79
21 SD-BS1 Section address 1 gating signal
I
2
48
DQ12 Data bus
I/O
1.16
22
MA10 Address bus
I
0.04
49
VDDQ 3.3V power supply
3.19
23
MA0 Address bus
I
0.36
50
DQ13 Data bus
I/O
1.15
24
MA1 Address bus
I
0.35
51
DQ14 Data bus
I/O
1.24
25
MA2 Address bus
I
2.38
52
VSSQ Ground
0.01
26
MA3 Address bus
I
1.59
53
DQ15 Data bus
I/O
0.68
27
VDD 3.3V power supply
3.19
54
VSS Ground
0.01
3.5.4 function introduction to D5954
D5954 (U302) is a servo drive IC with built-in 4-channel drive circuit. Digital focus, trace, feed and main
axis drive signal outputted by MT1389 is sent to D5954 for amplifying through RC integration circuit. The
focus, trace, feed and main axis drive signal being amplified by D5954 is sent to loader to fulfil the
corresponding servo work. The introduction to function pin is shown as the following table:
SN
Name
Function
Voltage when no
disc (V)
DVD disc voltage
(V)
CD disc voltage
(V)
1
VINFC
Focus control signal input
1.41
1.4
1.45
2
CF1
External feedback loop
2.3
2.54
2.43
3
CF2
External feedback loop
2.01
2.56
2.43
4
VINSL+
Forward control input, connected to reference
1.41
1.42
1.42
- 76 -