Dram Rank Temperature Write Data; Dimm Temperature Read / Write - Intel BX80619I73820 Design Manual

PECI Interface
Figure 7-11. DRAM Rank Temperature Write Data
31
7.1.2.6.4 DIMM Temperature Read
This feature allows the PECI host to read the temperature of all the DIMMs within a
channel up to a maximum of one DIMMs. This read is not limited to platforms using a
particular memory temperature source or temperature estimation method. For
platforms using DRAM thermal estimation, the PCU will provide the estimated
temperatures. Otherwise, the data represents the latest DIMM temperature provided
by the TSOD. Refer to
Figure 7-12. DIMM Temperature Read / Write
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7.1.2.6.5 DIMM Ambient Temperature Write / Read
This feature allows the PECI host to provide an ambient temperature reference to be
used by the processor for activity-based DRAM temperature estimation. This write is
used only when no DIMM temperature information is available from on-board or on-die
DIMM thermal sensors. It is also possible for the PECI host controller to read back the
DIMM ambient reference temperature.
Since the ambient temperature may vary over time within a system, it is recommended
that systems monitoring and updating the ambient temperature at a fast rate use the
'maximum' temperature value while those updating the ambient temperature at a slow
rate use an 'average' value. The ambient temperature assumes a single value for all
memory channel/DIMM locations and does not account for possible temperature
variations based on DIMM location.
Thermal/Mechanical Specifications and Design Guide
24 23
Rank# 3 Rank# 2
Absolute Temp Absolute Temp
(in Degrees C) (in Degrees C)
15
Reserved
Table 7-7
24 23
Reserved Reserved
DIMM Temperature Data
15
Reserved
16 15
Rank# 1
Absolute Temp
(in Degrees C)
Rank Temperature Data
6 5 3 2
DIMM Index
Parameter format
for channel index encodings.
16 15
Reserved
3
Parameter format
8 7 0
Rank# 0
Absolute Temp
(in Degrees C)
0
Channel Index
8 7 0
DIMM# 0
Absolute Temp
(in Degrees C)
2 0
Channel Index
65