Datasheet

DTM65521A
2 GB - 256Mx72, 240-Pin FB-DIMM
Document 06054, Revision A, 1-Aug-08, Dataram Corporation © 2008 Page 13
SERIAL PRESENCE DETECT MATRIX
(For Reference Only)
Byte# Function Value Hex
0 Number of Serial PD Bytes Written / SPD Device Size / CRC Coverage
176Bytes;
256 Bytes;
Bytes 0 - 116
92
1 SPD Revision Rev 1.1 11
2 Key Byte / DRAM Device Type
DDR2 FB
DIMM
09
3 Voltage Levels of this Assembly
DRAM = 1.8V
AMB=1.5V
12
4 SDRAM Addressing
Row = 14;
Col = 10;
Bank = 8
45
Thickness:
7.0 < x ≤ 8.0
5 Module Physical Attributes
Height:
30 < x ≤ 35
23
6 Module Type / Thickness FBDIMM 07
7 Module Organization 2 Rank; x8 11
8 Fine Timebase Dividend and Divisor 0 00
9 Medium Timebase Dividend 01
10 Medium Timebase Divisor
0.25 ns
04
11 SDRAM Minimum Cycle Time (tCKmin) 3.0ns 0C
12 SDRAM Maximum Cycle Time (tCKmax) 8.0 ns 20
13 SDRAM CAS Latencies Supported 3, 3 33
14 SDRAM Minimum CAS Latency Time (tAA) 15 ns 3C
15 SDRAM Write Recovery Times Supported 2-5 42
16 SDRAM Write Recovery Time (tWR) 15 ns 3C
17 SDRAM Write Latencies Supported 2-4 42
18 SDRAM Additive Latencies Supported 0-3 40
19 SDRAM Minimum RAS to CAS Delay (tRCD) 15 ns 3C
20 SDRAM Minimum Row Active to Row Active Delay (tRRD) 7.5 ns 1E
21 SDRAM Minimum Row Precharge Time (tRP) 15 ns 3C
22 SDRAM Upper Nibbles for tRAS and tRC 0 00
23 SDRAM Minimum Active to Precharge Time (tRAS) 45 ns B4
24 SDRAM Minimum Auto-Refresh to Active/Auto-Refresh Time (tRC) 60 ns F0
25 SDRAM Minimum Auto-Refresh to Active/Auto-Refresh CMD Period (tRFC) LSB FE
26 SDRAM Minimum Auto-Refresh to Active/Auto-Refresh CMD Period (tRFC) MSB
127.5 ns
01
27 SDRAM Internal Write to Read Command Delay (tWTR) 7.5 ns 1E
28 SDRAM Internal Read to Precharge Command Delay (tRTP) 7.5 ns 1E
29 SDRAM Burst Lengths Supported 4, 8 03
30 SDRAM Terminations Supported 50, 75, 150 07
31 SDRAM Drivers Supported Weak 01
32
SDRAM Average Refresh Interval (tREFI) / Double Refresh mode bit / High
Temperature
7.8 μs C2
33
Bits 7:4: Tcasemax Delta (SDRAM case temperature difference between maximum
case
10 52
34 Thermal resistance of SDRAM device package from top (case) to ambient (Psi T-A) 61 7A