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Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families 59
Datasheet Volume One
2.5.2.6.30 Caching Agent TOR Read
This feature allows the PECI host to read the Caching Agent (Cbo) Table of Requests
(TOR). This information is useful for debug in the event of a 3-strike timeout that
results in a processor IERR assertion. The 16-bit parameter field is used to specify the
Cbo index, TOR array index and bank number according to the following bit
assignments.
• Bits [1:0] - Bank Number - legal values from 0 to 2
• Bits [6:2] - TOR Array Index - legal values from 0 to 19
• Bits [10:7] - Cbo Index - legal values from 0 to 7
• Bit [11] - Read Mode - should be set to ‘0’ for TOR reads
• Bits [15:12] - Reserved
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
jmax
.
Figure 2-40. Caching Agent TOR Read Data
Read Mode (bit 11) = ‘1’
RESERVED
0
31
Core ID
2
4
Read Mode (bit 11) = ‘0’
Cbo TOR Data
031
Valid
bit
3
Figure 2-41. DTS Thermal Margin Read
Sign
Bit
14
RESERVED
16
Thermal Margin
(Integer Value)
61531
Thermal Margin
(Fractional Value)
5 0