White Electronic Designs
32MB- 4Mx64 SDRAM, UNBUFFERED
FEATURES
n
n
n
n
n
n
n
n
Burst Mode Operation
Auto and Self Refresh capability
LVTTL compatible inputs and outputs
Serial Presence Detect with EEPROM
Fully synchronous: All signals are registered on
the positive edge of the system clock
Programmable Burst Lengths: 1, 2, 4, 8 or Full
Page
3.3 volt 鹵 0.3v Power Supply
144 Pin SO-DIMM JEDEC
WED3DG644V-D1
DESCRIPTION
The WED3DG644V is a 4Mx64 synchronous DRAM
module which consists of four 4Mx16 SDRAM
components in TSOP- 11 package, and one 2K EEPROM
in an 8- pin TSSOP package for Serial Presence Detect
which are mounted on a 144 Pin SO-DIMM multilayer
FR4 Substrate.
* This product is subject to change without notice.
Pin
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
Front
V
SS
DQ0
DQ1
DQ2
DQ3
V
CC
DQ4
DQ5
DQ6
DQ7
V
SS
DQM0
DQM1
V
CC
A0
A1
A2
V
SS
DQ8
DQ9
DQ10
DQ11
V
CC
DQ12
DQ13
PIN CONFIGURATIONS (FRONT SIDE/BACK SIDE)
Pin
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
Back
V
SS
DQ32
DQ33
DQ34
DQ35
V
CC
DQ36
DQ37
DQ38
DQ39
V
SS
DQM4
DQM5
V
CC
A3
A4
A5
V
SS
DQ40
DQ41
DQ42
DQ43
V
CC
DQ44
DQ45
Pin
51
53
55
57
59
Front
DQ14
DQ15
V
SS
NC
NC
Pin
52
54
56
58
60
Back
DQ46
DQ47
V
SSv
NC
NC
Pin
95
97
99
101
103
105
107
109
111
113
115
117
119
121
123
125
127
129
131
133
135
137
139
141
143
Back
DQ21
DQ22
DQ23
V
CC
A6
A8
V
SS
A9
A10/AP
V
CC
DQM2
DQM3
V
SS
DQ24
DQ25
DQ26
DQ27
V
CC
DQ28
DQ29
DQ30
DQ31
V
SS
**SDA
V
CC
VOLTAGE KEY
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
93
CLK0
V
CC
RAS#
WE#
CS0#
*CS1#
DNU
V
SS
NC
NC
V
CC
DQ16
DQ17
DQ18
DQ19
V
SS
DQ20
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
CKE0
V
CC
CAS#
*CKE1
*A12
*A13
*CLK1
V
SS
NC
NC
V
CC
DQ48
DQ49
DQ50
DQ51
V
SS
DQ52
Pin
96
98
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
132
134
136
138
140
142
144
Back
DQ53
DQ54
DQ55
V
CC
A7
BA0
V
SS
BA1
A11
V
CC
DQM6
DQM7
VSS
DQ56
DQ57
DQ58
DQ59
V
CC
DQ60
DQ61
DQ62
DQ63
V
SS
**SCL
V
CC
A0 鈥?A11
BA0-1
DQ0-63
CLK0
CKE0
CS0#
RAS#
CAS#
WE#
DQM0-7
V
DD
V
SS
*V
REF
SDA
SCL
DNU
NC
PIN NAMES
Address input (Multiplexed)
Select Bank
Data Input/Output
Clock input
Clock Enable input
Chip select Input
Row Address Strobe
Column Address Strobe
Write Enable
DQM
Power Supply (3.3V)
Ground
Power supply for reference
Serial data I/O
Serial clock
Do not use
No Connect
* These pins are not used in this module.
** These pins should be NC in the system
which does not support SPD.
Sept. 2002 Rev. 0
1
White Electronic Designs Corporation 鈥?(602) 437-1520 鈥?www.whiteedc.com
1
2
3
4
5
6
