DATA SHEET
512MB Registered DDR2 SDRAM DIMM
EBE51RD8AGFA (64M words
×
72 bits, 1 Rank)
Description
The EBE51RD8AGFA is a 64M words
×
72 bits, 1 rank
DDR2 SDRAM Module, mounting 9 pieces of DDR2
SDRAM sealed in FBGA (µBGA
) package. Read and
write operations are performed at the cross points of
the CK and the /CK. This high-speed data transfer is
realized by the 4bits prefetch-pipelined architecture.
Data strobe (DQS and /DQS) both for read and write
are available for high speed and reliable data bus
design. By setting extended mode register, the on-chip
Delay Locked Loop (DLL) can be set enable or disable.
This module provides high density mounting without
utilizing surface mount technology.
Decoupling
capacitors are mounted beside each FBGA (µBGA) on
the module board.
Note: Do not push the components or drop the
modules in order to avoid mechanical defects,
which may result in electrical defects.
Features
•
240-pin socket type dual in line memory module
(DIMM)
PCB height: 30.0mm
Lead pitch: 1.0mm
Lead-free (RoHS compliant)
•
Power supply: VDD
=
1.8V
±
0.1V
•
Data rate: 667Mbps/533Mbps/400Mbps (max.)
•
SSTL_18 compatible I/O
•
Double-data-rate architecture: two data transfers per
clock cycle
•
Bi-directional, data strobe (DQS and /DQS) is
transmitted /received with data, to be used in
capturing data at the receiver
•
DQS is edge aligned with data for READs; center
aligned with data for WRITEs
•
Differential clock inputs (CK and /CK)
•
DLL aligns DQ and DQS transitions with CK
transitions
•
Commands entered on each positive CK edge; data
referenced to both edges of DQS
•
Four internal banks for concurrent operation
(components)
•
Data mask (DM) for write data
•
Burst length: 4, 8
•
/CAS latency (CL): 3, 4, 5
•
Auto precharge option for each burst access
•
Auto refresh and self refresh modes
•
Average refresh period
7.8µs at 0°C
≤
TC
≤ +85°C
3.9µs at
+85°C <
TC
≤ +95°C
•
Posted CAS by programmable additive latency for
better command and data bus efficiency
•
Off-Chip-Driver Impedance Adjustment and On-Die-
Termination for better signal quality
•
/DQS can be disabled for single-ended Data Strobe
operation
•
1 piece of PLL clock driver, 1 pieces of register driver
and 1 piece of serial EEPROM (2k bits EEPROM) for
Presence Detect (PD)
Document No. E0793E20 (Ver. 2.0)
Date Published October 2005 (K) Japan
Printed in Japan
URL: http://www.elpida.com
Elpida
Memory, Inc. 2005
EBE51RD8AGFA
Pin Description
Pin name
A0 to A13
A10 (AP)
BA0, BA1
DQ0 to DQ63
CB0 to CB7
/RAS
/CAS
/WE
/CS0
CKE0
CK0
/CK0
DQS0 to DQS17, /DQS0 to /DQS17
DM0 to DM8
SCL
SDA
SA0 to SA2
VDD
VDDSPD
VREF
VSS
ODT0
/RESET
NC
Par_In*
2
2
Function
Address input
Row address
Column address
Auto precharge
Bank select address
Data input/output
Check bit (Data input/output)
Row address strobe command
Column address strobe command
Write enable
Chip select
Clock enable
Clock input
Differential clock input
Input and output data strobe
Input mask
Clock input for serial PD
Data input/output for serial PD
Serial address input
Power for internal circuit
Power for serial EEPROM
Input reference voltage
Ground
ODT control
Reset pin (forces register and PLL inputs low) *
No connection
Parity bit for the address and control bus
Parity error found on the address and control bus
Not usable
1
A0 to A13
A0 to A9
Err_Out*
NU
Note: 1. Reset pin is connected to both OE of PLL and reset to register.
2. NC/Err_Out (Pin No. 55) and NC/Par_In (Pin No. 68) are for optional function to check address and
command parity.
Data Sheet E0793E20 (Ver. 2.0)
4
EBE51RD8AGFA
Serial PD Matrix*
1
Byte No.
0
1
2
3
4
5
6
7
8
9
Function described
Number of bytes utilized by module
manufacturer
Total number of bytes in serial PD
device
Memory type
Number of row address
Number of column address
Number of DIMM ranks
Module data width
Module data width continuation
Bit7
1
0
0
0
0
0
0
0
Bit6
0
0
0
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
Bit5
0
0
0
0
0
1
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
1
0
1
1
Bit4
0
0
0
0
0
0
0
0
0
1
1
1
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
1
0
1
0
1
Bit3
0
1
1
1
1
0
1
0
0
0
1
0
0
0
0
0
0
1
1
0
1
0
1
0
0
0
0
1
0
0
0
0
0
1
Bit2
0
0
0
1
0
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
0
0
0
0
0
1
Bit1
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
Bit0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
1
1
0
1
1
0
0
0
0
0
0
Hex value
80H
08H
08H
0EH
0AH
60H
48H
00H
05H
30H
3DH
50H
45H
50H
60H
02H
82H
08H
08H
00H
0CH
04H
38H
01H
01H
00H
03H
3DH
50H
50H
60H
50H
60H
3CH
Comments
128 bytes
256 bytes
DDR2 SDRAM
14
10
1
72
0
SSTL 1.8V
3.0ns*
1
Voltage interface level of this assembly 0
DDR SDRAM cycle time, CL = 5
-6E
-5C
-4A
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
3.75ns*
5.0ns*
1
1
10
SDRAM access from clock (tAC)
-6E
-5C
-4A
0.45ns*
0.5ns*
0.6ns*
ECC
7.8µs
×
8
×
8
0
4,8
4
3, 4, 5
1
1
1
11
12
13
14
15
16
17
18
19
20
21
22
23
DIMM configuration type
Refresh rate/type
Primary SDRAM width
Error checking SDRAM width
Reserved
SDRAM device attributes:
Burst length supported
SDRAM device attributes: Number of
banks on SDRAM device
SDRAM device attributes:
/CAS latency
DIMM Mechanical Characteristics
DIMM type information
SDRAM module attributes
SDRAM device attributes: General
Minimum clock cycle time at CL = 4
-6E, -5C
-4A
4.00mm max.
Registered
Normal
Weak Driver
50Ω ODT
Support
3.75ns*
5.0ns*
0.5ns*
0.6ns*
5.0ns*
0.6ns*
15ns
1
1
24
Maximum data access time (tAC) from
clock at CL = 4
0
-6E, -5C
-4A
0
0
1
1
1
25
26
27
Minimum clock cycle time at CL = 3
Maximum data access time (tAC) from
0
clock at CL = 3
Minimum row precharge time (tRP)
0
1
Data Sheet E0793E20 (Ver. 2.0)
5
DSP 与 ARM 处理器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
