Datasheet

SM646UDR26485-2-I
January 31, 2006
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9
Serial Presence Detect Table
Byte No. Byte Description Value Supported Value in Hex
0 # of bytes written into serial memory at module
manufacturer
128 Bytes 80h
1 Total # of bytes of SPD memory device 256 Bytes 08h
2 Fundamental memory type SDRAM DDR2 08h
3 # of row address on this assembly 14 0Eh
4 # of column address on this assembly 10 0Ah
5 # of Ranks, Package and Height 1, Planar, 30.00mm 60h
6 Data width of this assembly 64 40h
7 Reserved - 00h
8 Voltage interface standard of this assembly SSTL_18 05h
9 SDRAM cycle time from clock @ CAS latency of 5.0 3.0ns 30h
10 SDRAM access time from clock @ CAS latency of 5.0 0.45ns 45h
11 DIMM configuration type Non-ECC 00h
12 Refresh rate & type SR, 7.8 82h
13 Primary SDRAM width 8 08h
14 Error checking SDRAM width - 00h
15 Reserved - 00h
16 SDRAM device attributes : Burst lengths supported 4, 8 0Ch
17 SDRAM device attributes : # of banks on SDRAM
device
404h
18 SDRAM device attributes : CAS latency 3.0, 4.0, 5.0 38h
19 DIMM Mechanical Characteristics 2.70mm 01h
20 DIMM type information UDIMM 02h
21 SDRAM module attributes None 00h
22 SDRAM device attributes : General Weak Driver, 50Ω ODT 03h
23 SDRAM cycle time from clock @ CAS latency of 4.0 3.75ns 3Dh
24 SDRAM access time from clock @ CAS latency of 4.0 0.50ns 50h
25 SDRAM cycle time from clock @ CAS latency of 3.0 5.0ns 50h
26 SDRAM access time from clock @ CAS latency of 3.0 0.60ns 60h