IBM Intel Xeon X5570 44T1887 User Manual

Intel® Xeon® Processor 5500 Series Datasheet, Volume 2

111

Channel 2 DIMM Organization Descriptor Register.

12:10

RW

0

RANKOFFSET. Rank Offset for calculating RANK. This corresponds to the first 

logical rank on the DIMM. The rank offset is always programmed to 0 for the 

DIMM 0 DOD registers. (DIMM 0 rank offset is always 0.) DIMM 1 DOD rank 

offset is either 4 for two DIMMs per channel or 2 if there are three DIMMs per 

channel. DIMM2 DOD rank offset is always 4 as it is only used in three DIMMs 

per channel case.

9

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0

DIMMPRESENT. DIMM slot is populated.

8:7

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0

NUMBANK. Defines the number of (real, not shadow) banks on these DIMMs.
00: Four-banked
01: Eight-banked
10: Sixteen-banked

6:5

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0

NUMRANK. Defines the number of ranks on these DIMMs.
00: Single Ranked
01: Double Ranked
10: Quad Ranked

4:2

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0

NUMROW. Defines the number of rows within these DIMMs.
000: 2^12 Rows
001: 2^13 Rows
010: 2^14 Rows
011: 2^15 Rows
100: 2^16 Rows

1:0

RW

0

NUMCOL. Defines the number of columns within on these DIMMs.
00: 2^10 columns
01: 2^11 columns
10: 2^12 columns
11: RSVD