EBE21RD4AGFA Datasheet, PDF (5/23 Pages) Elpida Memory – 2GB Registered DDR2 SDRAM DIMM (256M words x 72 bits, 2 Ranks)

EBE21RD4AGFA
Serial PD Matrix*¹
Byte No. Function described
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Hex value
0
Number of bytes utilized by module
manufacturer
1 0 0 0 0 0 0 0 80H
1
Total number of bytes in serial PD
device
0 0 0 0 1 0 0 0 08H
2
Memory type
0 0 0 0 1 0 0 0 08H
3
Number of row address
0 0 0 0 1 1 1 0 0EH
4
Number of column address
0 0 0 0 1 0 1 1 0BH
5
Number of DIMM ranks
0 1 1 0 0 0 0 1 61H
6
Module data width
0 1 0 0 1 0 0 0 48H
7
Module data width continuation
0 0 0 0 0 0 0 0 00H
8
Voltage interface level of this assembly 0 0 0 0 0 1 0 1 05H
9
DDR SDRAM cycle time, CL = 5
-6E
0 0 1 1 0 0 0 0 30H
-5C
0 0 1 1 1 1 0 1 3DH
-4A
10
SDRAM access from clock (tAC)
-6E
-5C
0 1 0 1 0 0 0 0 50H
0 1 0 0 0 1 0 1 45H
0 1 0 1 0 0 0 0 50H
-4A
0 1 1 0 0 0 0 0 60H
11
DIMM configuration type
0 0 0 0 0 0 1 0 02H
12
Refresh rate/type
1 0 0 0 0 0 1 0 82H
13
Primary SDRAM width
0 0 0 0 0 1 0 0 04H
14
Error checking SDRAM width
0 0 0 0 0 1 0 0 04H
15
Reserved
0 0 0 0 0 0 0 0 00H
16
SDRAM device attributes:
Burst length supported
0 0 0 0 1 1 0 0 0CH
17
SDRAM device attributes: Number of
banks on SDRAM device
0
0
0
0
0
1
0
0
04H
18
SDRAM device attributes:
/CAS latency
0 0 1 1 1 0 0 0 38H
19
DIMM Mechanical Characteristics
0 0 0 0 0 0 0 1 01H
20
DIMM type information
0 0 0 0 0 0 0 1 01H
21
SDRAM module attributes
0 0 0 0 0 0 0 0 00H
22
SDRAM device attributes: General
0 0 0 0 0 0 1 1 03H
23
Minimum clock cycle time at CL = 4
-6E, -5C
0 0 1 1 1 1 0 1 3DH
-4A
0 1 0 1 0 0 0 0 50H
Maximum data access time (tAC) from
24
clock at CL = 4
0 1 0 1 0 0 0 0 50H
-6E, -5C
-4A
0 1 1 0 0 0 0 0 60H
25
Minimum clock cycle time at CL = 3
0 1 0 1 0 0 0 0 50H
26
Maximum data access time (tAC) from
clock at CL = 3
0
1
1
0
0
0
0
0
60H
27
Minimum row precharge time (tRP)
0 0 1 1 1 1 0 0 3CH
Comments
128 bytes
256 bytes
DDR2 SDRAM
14
11
2
72
0
SSTL 1.8V
3.0ns*¹
3.75ns*¹
5.0ns*¹
0.45ns*¹
0.5ns*¹
0.6ns*¹
ECC
7.8µs
×4
×4
0
4,8
4
3, 4, 5
4.00mm max.
Registered
Normal
Weak Driver
50Ω ODT Support
3.75ns*¹
5.0ns*¹
0.5ns*¹
0.6ns*¹
5.0ns*¹
0.6ns*¹
15ns
Data Sheet E0794E20 (Ver. 2.0)
5