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What is WED3DL644V?

This electronic component, produced by the manufacturer "White Electronic Designs", performs the same function as "4Mx64 SDRAM".


WED3DL644V Datasheet PDF - White Electronic Designs

Part Number WED3DL644V
Description 4Mx64 SDRAM
Manufacturers White Electronic Designs　
Logo White Electronic Designs Logo　


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Whitewww.datasheet4u.com Electronic Designs
WED3DL644V
4Mx64 SDRAM
FEATURES
53% Space Savings vs. Monolithic Solution
Reduced System Inductance and Capacitance
3.3V Operating Supply Voltage
Fully Synchronous to Positive Clock Edge
Clock Frequencies of 133, 125 and 100MHZ
Burst Operation
Sequential or Interleaved
Burst Length = Programmable 1, 2, 4, 8 or Full
Page
Burst Read and Write
Multiple Burst Read and Single Write
Data Mask Control Per Byte
Auto and Self Refresh
Automatic and Controlled Precharge Commands
Suspend Mode and Power Down Mode
17mm x 23mm, 153 BGA
DESCRIPTION
The WED3DL644V is a 4Mx64 Synchronous DRAM
configured as 4x1Mx64. The SDRAM BGA is constructed
with four 4Mx16 SDRAM die mounted on a multi-layer
laminate substrate and packaged in a 153 lead, 17mm by
23mm, BGA.
The WED3DL644V is available in clock speeds of 133MHZ,
125MHZ and 100MHZ. The range of operating frequencies,
programmable burst lengths and programmable latencies
allow the same device to be useful for a variety of
high bandwidth, high performance memory system
applications.
The package and design provides performance
enhancements via a 50% reduction in capacitance vs.
four monolithic devices. The design includes internal ground
and power planes which reduces inductance on the ground
and power pins allowing for improved decoupling and a
reduction in system noise.
This product is subject to change without notice.
PINOUT (TOP VIEW)
1 2 3 4 56 7 8 9
A DQ41 DQ43 DQ45 DQ47 NC DQ48 DQ50 DQ52 DQ54
B DQ40 DQ42 DQ44 DQ46 NC DQ49 DQ51 DQ53 DQ55
C DQ33 DQ35 DQ37 DQ39 NC DQ56 DQ58 DQ60 DQ62
D DQ32 DQ34 DQ36 DQ38 NC DQ57 DQ59 DQ61 DQ63
E NC DQML2 DQMH2 VCC VCC VCC DQML3 DQMH3 NC
F NC
VCCQ
VCCQ
VCC VCC VCC VCCQ VCCQ
A3
G CE2# CE3# VSS VSS VSS VSS VSS A4 A2
H NC NC VSS CK1 VSS VSS VSS A5 A1
J NC CKE CAS# RAS# WE# A9 A11 A6 A0
K NC NC
VSS CK0 VSS VSS VSS
A7 A10
L CE1# CE0# VSS
VSS VSS VSS VSS
A8 BA1
M NC
VCCQ
VCCQ
VCC VCC VCC VCCQ VCCQ BA0
N NC DQMH1 DQML1 VCC VCC VCC DQMH0 DQML0 NC
P DQ30 DQ28 DQ26 DQ24 NC DQ06 DQ04 DQ02 DQ00
R DQ31 DQ29 DQ27 DQ25 NC DQ07 DQ05 DQ03 DQ01
T DQ22 DQ20 DQ18 DQ16 NC DQ14 DQ12 DQ10 DQ08
U DQ23 DQ21 DQ19 DQ17 NC DQ15 DQ13 DQ11 DQ09
PIN DESCRIPTION
A0 – A11
BA0-1
DQ0-63
CK0-1
CKE
DQML0-3
DQMH0-3
RAS#
CAS#
WE#
CE0-3#
VCC
VCCQ
VSS
Address Bus
Bank Select Addresses
Data Bus
Clock
Clock Enable
Data Input/Output Masks
Row Address Strobe
Column Address Strobe
Write Enable
Chip Enables
Power Supply pins, 3.3V
Data Bus Power Supply, 3.3V
Ground pins
August 2005
Rev. 6
1 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

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WED3DL644V equivalent
Whitewww.datasheet4u.com Electronic Designs
WED3DL644V
FIG.2
Mode Register Definition
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus
11 10 9 8 7
Reserved* WB Op Mode
6 54 3
CAS Latency BT
2 10
Burst Length
Mode Register(Mx)
*Should program
M11, M10 = “ 0, 0”
to ensure compatibility
with future devices.
M2 M1 M0
000
001
010
011
100
101
110
111
Burst Length
M3 = 0
1
2
4
8
Reserved
Reserved
Reserved
Full Page
M3 = 1
1
2
4
8
Reserved
Reserved
Reserved
Reserved
M3
0
1
M6 M5 M4
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
Burst Type
Sequential
Interleaved
CAS Latency
Reserved
Reserved
2
3
Reserved
Reserved
Reserved
Reserved
M8 M7 M6-M0 Operating Mode
0
0
Defined
Standard Operation
--
- All other states reserved
M9 Write Burst Mode
0 Programmed Burst Length
1 Single Location Access
BURST DEFINITION
Burst
Length
2
4
8
Full
Page
(y)
Starting Column Order of Accesses Within a Burst
Address
Type = Sequential Type = Interleaved
A0
0 0-1
0 1-0
0-1
1-0
A1 A0
00
01
10
11
0-1-2-3
1-2-3-0
2-3-0-1
3-0-1-2
0-1-2-3
1-0-3-2
2-3-0-1
3-2-1-0
A2 A1 A0
0 00
0 01
0 10
0 11
1 00
1 01
1 10
1 11
n = A0 - A9/8/7
(location 0-y)
0-1-2-3-4-5-6-7
1-2-3-4-5-6-7-0
2-3-4-5-6-7-0-1
3-4-5-6-7-0-1-2
4-5-6-7-0-1-2-3
5-6-7-0-1-2-3-4
6-7-0-1-2-3-4-5
7-0-1-2-3-4-5-6
Cn, Cn+1, Cn+2
Cn+3, Cn+4...
...Cn-1,
Cn...
0-1-2-3-4-5-6-7
1-0-3-2-5-4-7-6
2-3-0-1-6-7-4-5
3-2-1-0-7-6-5-4
4-5-6-7-0-1-2-3
5-4-7-6-1-0-3-2
6-7-4-5-2-3-0-1
7-6-5-4-3-2-1-0
Not Supported
August 2005
Rev. 6
5 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com


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Featured Datasheets

Part NumberDescriptionMFRS
WED3DL644VThe function is 4Mx64 SDRAM. White Electronic DesignsWhite Electronic Designs

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