JG82875 S L8DB Intel, JG82875 S L8DB Datasheet - Page 130

• Manufacturer Part Number: JG82875 S L8DB
• Manufacturer: Intel

Specifications of JG82875 S L8DB

• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Functional Description
5.2.3
5.2.3.1
5.2.4
130
Note: In
Single-Channel (SC) Mode
If either only channel A or only channel B is populated, then the MCH is set to operate in single-
channel mode. Data is accessed in chunks of 64 bits (8B) from the memory channels. If both
channels are populated with uneven memory (DIMMs), the MCH defaults to virtual single-channel
(VSC) mode. VSC occurs when both channels are populated but the DIMMs are not identical or
there is an odd number of identical DIMMs. The MCH behaves identical in both single-channel
and virtual single-channel modes (hereafter referred to as single-channel (SC) mode).
In SC mode of operation, the populated DIMMs configuration can be identical or completely
different. In addition, for SC mode, not all the slots need to be populated. For example, populating
only one DIMM in channel A is a valid configuration for SC mode. Likewise, in VSC mode odd
number of slots can be populated. For Dynamic Mode operation, the requirement is to have an even
number or rows (side of the DIMM) populated. In SC, dynamic mode operation can be enabled
with one single-sided (SS), two SS or two double-sided (DS). For VSC mode, both the channels
need to have identical row structures.
Linear Mode
This mode is the normal mode of operation for the MCH.
Memory Address Translation and Decoding
The address translation and decoding for the GMCH is provided in
supported DIMM configurations are listed in the following bullets. Refer to
details about the configurations being double-sided versus single-sided.
The table cell contents refers to host address signals HAx.
•
•
•
•
•
•
Table 18
Technology 128 Mbit – 16Mx8 – page size of 8 KB – row size of 128 MB
Technology 128 Mbit – 8Mx16 – page size of 4 KB – row size of 64 MB
Technology 256 Mbit – 32Mx8 – page size of 8 KB – row size of 256 MB
Technology 256 Mbit – 16Mx16 – page size of 4 KB – row size of 128 MB
Technology 512 Mbit – 32Mx16 – page size of 8 KB – row size of 256 MB
Technology 512 Mbit – 64Mx8 – page size of 16 KB – row size of 512 MB
through
Table 21
A0, A1, … refers to memory address MA0, MA1, ….
Table 18
Intel
®
82875P MCH Datasheet
through
Section 5.2.5
Table
for
21. The