Data Sheet
168-pin Low Profile SDRAM DIMMs
32MB, 64MB, 128MB, 256MB, 512MB
256MB ECC DIMM Functional Block Diagram – SM25609ALDT
S0#
Clock Wiring
S1#
CK0
CK1
CK2
CK3
U5
DQ(39:32)
CK0-3
U14
10
SDRAMs
5 SDRAM
5 SDRAM
4 SDRAM+3.3 pf
4 SDRAM+3.3 pf
DQMB0
U0
DQ(7:0)
U9
DQMB4
DQMB1
U1
DQ(15:8)
U10
DQMB5
U6
DQ(47:40)
SCL
Serial PD
SA0-2
WP
47K
U2
U11
Note:
SDRAM U11 DQM input
is wired to DQMB5.
BA0
BA1
BA0 SDRAM U0-17
BA1 SDRAM U0-17
A0-A11 SDRAM U0-17
Vdd SDRAM U0-17
Vss SDRAM U0-17
SDA
U15
DQ(15:8)
S2#
S3#
A0-A11
Vdd
Vss
DQMB2
U3
DQ(23:16)
U12
DQMB6
U7
DQ(55:48)
U16
RAS#
CAS#
WE#
RAS# SDRAM U0-17
CAS# SDRAM U0-17
WE# SDRAM U0-17
CKE SDRAM U0-8
CKE SDRAM U9-17
DQMB3
U4
DQ(31:24)
U13
DQMB7
U8
DQ(63:56)
U17
CKE0
CKE1
Note:
All DQ resistor values are 10 ohms.
All CK resistor values are 10 ohms.
U0-U17 are 16Mx8 PC133 SDRAM Devices.
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: (719) 488-9095;
http://www.edram.com
2001 Enhanced Memory Systems. All rights reserved.
The information contained herein is subject to change without notice.
Page 9 of 20
Revision 1.1
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
