Datasheet

DTM64378A
8GB - 240-Pin 2Rx4 Registered ECC DDR3 DIMM
Document 06824, Revision A, 4-Aug-11, Dataram Corporation 

 2011 Page 8
Serial Presence Detect
Byte# Function. Value Hex
Number of Bytes Used / Number of Bytes in SPD
Device / CRC Coverage
Bit 3 ~ Bit 0. SPD Bytes Used - 176
Bit 6 ~ Bit 4. SPD Bytes Total - 256
0
Bit 7. CRC Coverage -
Bytes 0-
116
0x92
1
SPD Revision
Rev. 1.1
0x11
2
Key Byte / DRAM Device Type
DDR3
SDRAM
0x0B
Key Byte / Module Type
Bit 3 ~ Bit 0. Module Type -
RDIMM
3
Bit 7 ~ Bit 4. Reserved - 0
0x01
SDRAM Density and Banks.
Bit 3 ~ Bit 0. Total SDRAM capacity, in megabits -
2Gb
Bit 6 ~ Bit 4. Bank Address Bits -
8 banks
4
Bit 7. Reserved - 0
0x03
SDRAM Addressing.
Bit 2 ~ Bit 0. Column Address Bits - 11
Bit 5 ~ Bit 3. Row Address Bits - 15
5
Bit 7, 6. Reserved 0
0x1A
6
Reserved.
0x00
Module Organization.
Bit 2 ~ Bit 0. SDRAM Device Width - 4-
Bits
Bit 5 ~ Bit 3. Number of Ranks - 2-
Rank
7
Bit 7, 6. Reserved 0
0x08
Module Memory Bus Width.
Bit 2 ~ Bit 0. Primary bus width, in bits - 64-
Bits
Bit 4, Bit 3. Bus width extension, in bits - 8-
Bits
8
Bit 7 ~ Bit 5. Reserved - 0
0x0B
Fine Timebase (FTB) Dividend / Divisor.
Bit 3 ~ Bit 0. Fine Timebase (FTB) Divisor 1
9
Bit 7 ~ Bit 4. Fine Timebase (FTB) Dividend 1
0x11
10
Medium Timebase (MTB) Dividend.
1 (MTB =
0.125ns)
0x01
11
Medium Timebase (MTB) Divisor.
8 (MTB =
0.125ns)
0x08
12
SDRAM Minimum Cycle Time (tCKmin).
1.25ns 0x0A
13 Reserved. UNUSED 0x00