IBM Intel Xeon E5606 81Y5943 User Manual
Product codes
81Y5943
Intel
®
Xeon
®
Processor 5600 Series Datasheet Volume 1
157
Thermal Specifications
7.3.5
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.
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.
Please refer to the definition of each command in
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.
response policy definition is generic, and more advanced response policies may be
employed at the discretion of the originator developer.
7.3.6
Temperature Data
7.3.6.1
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.
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.
7.3.6.2
Interpretation
The resolution of the processor’s Digital Thermal Sensor (DTS) is approximately 1°C,
which can be confirmed by a RDMSR from IA32_THERM_STATUS MSR (0x19C) where it
is architecturally defined. PECI temperatures are sent through a 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.
which can be confirmed by a RDMSR from IA32_THERM_STATUS MSR (0x19C) where it
is architecturally defined. PECI temperatures are sent through a 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.
Temperature readings from the processor are always negative, and imply an offset
from the reference TCC activation temperature. As an example, assume that the TCC
activation temperature reference is 100°C. A PECI thermal reading of -10°C indicates
that the processor is running at 10°C below the TCC activation temperature, or 90°C.
from the reference TCC activation temperature. As an example, assume that the TCC
activation temperature reference is 100°C. A PECI thermal reading of -10°C indicates
that the processor is running at 10°C below the TCC activation temperature, or 90°C.
Table 7-35. 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. May be due to illegal command codes.
Fail
Retry
Either the PECI client doesn’t support the current command code, or it has
failed in its attempts to construct a response.
None (all 0’s) Force bus idle
(1ms low), retry
Fail with PECI client device error. Client may be dead or otherwise non-
responsive (in RESET or S1, for example).
Pass
Pass
NA
Good FCS
Pass
NA
Figure 7-31. Temperature Sensor Data Format
MSB
Upper nibble
Upper nibble
MSB
Lower nibble
Lower nibble
LSB
Upper nibble
Upper nibble
LSB
Lower nibble
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)