168-pin Low Profile Registered SDRAM DIMMs
256MB, 512MB, 1GB
Preliminary Data Sheet
256MB ECC DIMM Functional Block Diagram – SM25609ARDT8
RS0#
RS1#
Clock Wiring
CK0
CK1
CK2
CK3
PLL
Terminated
Terminated
Terminated
RDQMB0
DQ(7:0)
RDQMB4
DQ(39:32)
U0
U1
U2
U9
U5
U6
U14
U15
10
CK1-3
12pF
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
Register x 2
RDQMB1
DQ(15:8)
RDQMB5
U10
U11
DQ(47:40)
10
CK0
PLL
12pF
Note:
CB(7:0)
SDRAM U11 DQM input
is wired to RDQMB5.
SCL
SDA
Serial PD
SA0-2
WP
47K
RS2#
RS3#
Vdd
Vss
Vdd SDRAM U0-17
Vss SDRAM U0-17
RDQMB2
RDQMB6
DQ(55:48)
U3
U4
U12
U13
U7
U8
U16
U17
DQ(23:16)
RAS#
RRAS#
RCAS#
CAS#
CKE0
R
RDQMB3
DQ(31:24)
RDQMB7
DQ(63:56)
RCKE0
E
G
I
WE#
RWE#
S
T
E
R
A0-11
RA0-11
RBA0-1
RS0-3#
RDQMB0-7
BA0-1
S0-3#
DQMB0-7
PLL CLK
Note:
10K
All DQ resistor values are 10 ohms.
All CK resistor values are 10 ohms.
U0-U17 are 16Mx8 SDRAM devices.
VDD
REGE
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.
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Revision 1.1
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
