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FH8065401488915
Volume 2—SMBus 2.0 Unit 2 - PECI—C2000 Product Family
DRAM Thermal Capabilities
Intel
®
Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 2 of 3
September 2014
410
Order Number: 330061-002US
17.8
DRAM Thermal Capabilities
Various DRAM component temperature data can be accessed using the RdPkgConfig()
and WrPkgConfig() PECI commands addressed to the SoC. See
and
for the
format of the commands. The accessible data structures are given in
which
contains the values of the command’s Index, Parameter, and PECI Data fields.
Table 17-24. Summary of DRAM Thermal Services
Service
Index
Field
(Decimal)
Parameter
Field
(Word)
PECI Data Field
(DWord)
Description
Alternate
In-band
MSR or
CSR
Access
Supported
WrPkgConfig()
DRAM Rank
Temperature
Write
18
Channel
Index
and
DIMM
Index
1
1. See
Absolute
temperature in
Degrees Celsius
for ranks 0-3
2
2. See
Write the
temperature
for each Rank
within a
single DIMM
none
Yes
RdPkgConfig()
DRAM Channel
Temperature
Read
22
0x0000
Maximum of all
rank
temperatures for
each channel in
Degrees Celsius
Read the
maximum
DRAM
Channel
Temperature
none
Yes
WrPkgConfig()
RdPkgConfig()
DIMM Ambient
Temperature
Write/Read
19
0x0000
Absolute
temperature in
Degrees C to be
used as ambient
temperature
reference
Write/Read
ambient
temperature
reference for
activity-based
Rank
Temperature
estimation
none
No
Figure 17-9. Channel Index and DIMM Index Parameter Word
Table 17-25. Channel Index and DIMM Index
Index
Encoding
Physical
Channel Number
Physical
DIMM Number
000 0 0
001 1 1
010 Reserved
2
011 Reserved
3
15
6
2
0
Reserved
Channel
Index
DIMM
Index
5
3