Service manual
CD-SW250DVD
8 – 13
IC3203 VHiM24C04WMN-:4K Bit EEPROM (M24C04)
IC3206 VHiiC42S16400:64M SD-RAM (IC42S16400)
In this unit, the terminal with asterisk mark (*) is (open) terminal which
is not connected to the outside.
Pin No. Terminal name Function
1,2,3, E0,E1,E2 Chip Enable
5SDA SerialData
6 SCL Serial Clock
7 WC Write Control
8 VCC Supply Voltage
4 VSS Ground
Figure 8-7 BLOCK DIAGRAM OF IC
E0
E1
E2
VSS
VCC
M24C04
1
2
3
4
8
7
6
5
WC
SCL
SDA
Pin No. Terminal name Function
38 CLK Master Clock
37 CKE Clock Enable
19 CS Chip Select
18 RAS Row Address Strobe
17 CAS Column Address Strobe
16 WE Write Ena ble
2,4,5,7,8,
10,11,13,
42,44,45,
47,48,
50,51,53
DQ0>DQ15
Data I/O
15 DQM DQ Mask Enable
22,24,25,
26,29,30,
31,32,33,
34,35
A0-11
Address Input
20,21 BA0,1 Bank Address
1,14,27 VDD Power Supply
3,9 VDDO Power Supply for DQ
28,41,54 VSS Ground
6,12,52 VSSQ Ground for DQ
36*,40* NC Not Connected
Figure 8-8 BLOCK DIAGRAM OF IC
VDD
DQO
VDDQ
DQ1
DQ2
VSSQ
DQ3
DQ4
VDDQ
DQ5
DQ6
VSSQ
DQ7
VDD
LDQM
WE
CAS
RAS
CS
BA0
BA1
A10
A0
A1
A2
A3
VDD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
VSS
DQ15
VSSQ
DQ14
DQ13
VDDQ
DQ12
DQ11
VSSQ
DQ10
DQ9
VDDQ
DQ8
VSS
NC
UDQM
CLK
CKE
NC
A11
A9
A8
A7
A6
A5
A4
VSS
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28