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Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families 75
Datasheet Volume One of Two
Interfaces
Note: The codes explicitly defined in Table 2-22 may be useful in PECI originator response
algorithms. Reserved or undefined codes may also be generated by a PECI client
device, and the originating agent must be capable of tolerating any code. The Pass/Fail
mask defined in
Table 2-21 applies to all codes, and general response policies may be
based on this information. Refer to Section 2.5.6 for originator response policies and
recommendations.
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 Table 2-22 for
originator response guidelines.
Refer to the definition of each command in Section 2.5.2 for a specific definition of
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.
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 Celsius. This format allows temperatures in a range of ±512°C to be
reported to approximately a 0.016°C resolution.
Table 2-23. Originator Response Guidelines
Response After 1 Attempt After 3 Attempts
Bad FCS Retry Fail with PECI client device error.
Abort FCS Retry Fail with PECI client device error if command was not illegal or
malformed.
CC: 0x8x Retry The PECI client has failed in its attempts to generate a response.
Notify application layer.
CC: 0x9x Abandon any further
attempts and notify
application layer
n/a
None (all 0’s) Force bus idle (drive
low) for 1 mS and retry
Fail with PECI client device error. Client may not be alive or may be
otherwise unresponsive (for example, it could be in RESET).
CC: 0x4x Pass n/a
Good FCS Pass n/a
Figure 2-50. Temperature Sensor Data Format
MSB
Upper nibble
MSB
Lower nibble
LSB
Upper nibble
LSB
Lower nibble
S x x x x x x x x x x x x x x x
Sign Integer Value (0-511) Fractional Value (~0.016)