Originator Responses; Dts Temperature Data; Temperature Sensor Data Format; Originator Response Guidelines - Intel Xeon Processor E5-1600 Datasheet

2.5.6

Originator Responses

The simplest policy that an originator may employ in response to receipt of a failing
completion code is to retry the request. However, certain completion codes or FCS
responses are indicative of an error in command encoding and a retry will not result in
a different response from the client. Furthermore, the message originator must have a
response policy in the event of successive failure responses. Refer to

originator response guidelines.

Refer to the definition of each command in
possible command codes or FCS responses for a given command. The following
response policy definition is generic, and more advanced response policies may be
employed at the discretion of the originator developer.
Table 2-23. Originator Response Guidelines
Response
Bad FCS
Abort FCS
CC: 0x8x
CC: 0x9x
None (all 0's)
CC: 0x4x
Good FCS
2.5.7

DTS Temperature Data

2.5.7.1 Format
The temperature is formatted in a 16-bit, 2's complement value representing a number
of 1/64 degrees centigrade. This format allows temperatures in a range of ±512° C to
be reported to approximately a 0.016° C resolution.
Figure 2-50. Temperature Sensor Data Format
MSB
Upper nibble
S x x x
Sign
2.5.7.2 Interpretation
The resolution of the processor's Digital Thermal Sensor (DTS) is approximately 1°C,
which can be confirmed by a RDMSR from the IA32_THERM_STATUS MSR where it is
architecturally defined. The MSR read will return only bits [13:6] of the PECI
temperature sensor data defined in
configurable low-pass filter prior to delivery in the GetTemp() response data. The
output of this filter produces temperatures at the full 1/64°C resolution even though
the DTS itself is not this accurate.
76
After 1 Attempt
Retry Fail with PECI client device error.
Retry Fail with PECI client device error if command was not illegal or
malformed.
Retry The PECI client has failed in its attempts to generate a response.
Notify application layer.
Abandon any further N/A
attempts and notify
application layer
Force bus idle (drive Fail with PECI client device error. Client may not be alive or may be
low) for 1 mS and retry otherwise unresponsive (for example, it could be in RESET).
Pass N/A
Pass N/A
MSB
Lower nibble
x x x x
Integer Value (0-511)
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Section 2.5.2 for a specific definition of
After 3 Attempts
LSB
Upper nibble
x x x x
Fractional Value (~0.016)
Figure 2-50. PECI temperatures are sent through a
Table 2-22 for
LSB
Lower nibble
x x x x
Datasheet Volume One