3.5.2 Function introduction to FLASH(U302)
FLASH 16Mbit memorizer, FLASH function pin are shown as follows:
Pin
Name
Function
Voltage (when no disc)
Data direction
1-9, 16-25, 48
AO-A19
20 bit address bus
I
11
WE
Write enable signal, low level is effective
3.23V
I
12
RESET
Reset, low level is effective
3.23V
I
10, 13, 14
NC
Blank pin
15
RY/BY
Ready/system busy
3.23V
O
26
CE
Chip enable, low level effective
0V
I
27
、
46
VSS
Ground
28
OE
Output enable signal , low level is effective
0V
I
29-3, 6, 38-44
DQ0-DQ14
15 bit data bus
O
37
VCC
5V power supply
+5V
45
DQ15/A-1
Take word extend mode as data line, and bit
extend mode as address line
I/O
47
BYTE
Select 8-bit or 16-bit output mode. High level
is 16-bit output and low level is 8-bit output
I
3.5.3 Function introduction to D5954
D5954 (U118) 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
5
VINSL-
Main axis control signal input
1.4
1.42
1.42
6
VOSL
External feedback resistor
1.4
1.17
1.21
7
VINFFC
Focus feedback signal input
1.92
2.59
2.36
8
VCC
5V power supply
5.38
5.04
5.01
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