W3DG644V-D2
White Electronic Designs
PRELIMINARY*
32MB - 4M x 64 SDRAM UNBUFFERED
FEATURES
DESCRIPTION
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PC100 and PC133 compatible
The W3DG644V is a 4M x 64 synchronous DRAM module
which consists of four 4M x 16 SDRAM components in
TSOP II package and one 2K EEPROM in an 8 pin TSSOP
package for Serial Presence Detect which are mounted
on a 168 pin DIMM multilayer FR4 Substrate.
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
*This product is under development, is not qualified or characterized and is subject to
change without notice.
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Programmable Burst Lengths: 1, 2, 4, 8 or Full Page
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3.3V 0.3V Power Supply
168 pin DIMM JEDEC
PIN CONFIGURATIONS (FRONT SIDE/BACK SIDE)
PIN NAMES
A0 – A11
BA0-1
DQ0-63
CLK0,CLK2
CKE0
CS0#,CS2#
RAS#
CAS#
WE#
DQM0-7#
VCC
VSS
SDA
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
PIN FRONT PIN
FRONT
DQM1
CS0#
DNU
VSS
A0
A2
A4
A6
A8
A10/AP
BA1
VCC
VCC
CLK0
VSS
DNU
CS2#
DQM2
DQM3
DNU
VCC
PIN FRONT PIN
BACK
VSS
DQ32
DQ33
DQ34
DQ35
VCC
DQ36
DQ37
DQ38
DQ39
DQ40
VSS
DQ41
DQ42
DQ43
DQ44
DQ45
VCC
DQ46
DQ47
NC
NC
VSS
NC
NC
VCC
CAS#
DQM4
PIN
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
BACK
DQM5
CS1#
RAS#
VSS
A1
A3
A5
A7
A9
BA0
A11
VCC
NC
NC
VSS
CKE0
NC
DQM6
DQM7
NC
PIN
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
BACK
DQ50
DQ51
VCC
DQ52
NC
NC
DNU
VSS
DQ53
DQ54
DQ55
VSS
DQ56
DQ57
DQ58
DQ59
VCC
DQ60
DQ61
DQ62
DQ63
VSS
1
2
VSS
DQ0
DQ1
DQ2
DQ3
VCC
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
DQ18
DQ19
VCC
DQ20
NC
NC
NC
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
3
4
5
6
7
8
9
10
11
12
13
DQ4
DQ5
DQ6
DQ7
DQ8
VSS
VSS
DQ21
DQ22
DQ23
VSS
DQ24
DQ25
DQ26
DQ27
VCC
DQ28
DQ29
DQ30
DQ31
VSS
CLK2
NC
Serial data I/O
Serial clock
Do not use
DQ9
SCL
DNU
NC
14 DQ10
15 DQ11
16 DQ12
17 DQ13
No Connect
18
VCC
* WP (write protect) option available on pin 81, see
ordering information on page 5.
19 DQ14
20 DQ15
** These pins should be NC in the system which
does not support SPD.
21
22
23
24
25
26
27
NC
NC
VSS
NC
NC
VCC
WE#
VCC
NC
NC
NC
NC
VSS
DQ48
DQ49
NC
NC
NC
NC
VSS
DQ16
DQ17
NC
NC
**SA0
**SA1
**SA2
VCC
*WP
**SDA
**SCL
VCC
28 DQM0
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
July 2004
Rev 1
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com