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Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families 59
Datasheet Volume One of Two
Interfaces
Bit[11] is the Read Mode bit and should be set to ‘0’ for TOR reads. The Read Mode bit
can alternatively be set to ‘1’ to read the ‘Core ID’ (with associated valid bit as shown in
Figure 2-40) that points to the first core that asserted the IERR. In this case bits [10:0]
of the parameter field are ignored. The ‘Core ID’ read may not return valid data until at
least 1 mS after the IERR assertion.
Note: Reads to caching agents that are not enabled will return all zeroes. Refer to the debug handbook for
details on methods to interpret the crash dump results using the Cbo TOR data shown in Figure 2-40.
2.5.2.6.31 Thermal Margin Read
This service allows the PECI host to read the margin to the processor thermal profile or
load line. Thermal margin data is returned in the format shown in Figure 2-41 with a
sign bit, an integer part and a fractional part. A negative thermal margin value implies
that the processor is operating in violation of its thermal load line and may be indicative
of a need for more aggressive cooling mechanisms through a fan speed increase or
other means. This PECI service will continue to return valid margin values even when
the processor die temperature exceeds T
Prochot
.
2.5.2.7 RdIAMSR()
The RdIAMSR() PECI command provides read access to Model Specific Registers
(MSRs) defined in the processor’s Intel® Architecture (IA). MSR definitions may be
found in the Intel® Xeon® Processor E5 v2 Product Family Processor Datasheet,
Volume Two: Registers. Refer to Table 2-11 for the exact listing of processor registers
accessible through this command.
2.5.2.7.1 Command Format
The RdIAMSR() format is as follows:
Write Length: 0x05
Read Length: 0x09 (qword)
Command: 0xb1
Figure 2-40. Caching Agent TOR Read Data
Read Mode (bit 11) = ‘0’ (within the Paramenter)
031
Cbo TOR Data
Read Mode (bit 11) = ‘1’ (within the Parameter)
RESERVED
031
Core ID
35
Valid
4
Figure 2-41. DTS Thermal Margin Read
Sign
Bit
14
RESERVED
16
Thermal Margin
(Integer Value)
61531
Thermal Margin
(Fractional Value)
5 0