Thermal Specifications
Example bus transaction for a thermal sensor device located at address 0x30 returning
a value of negative 10°C:
Figure 6-12. GetTemp() Example
Byte #
0
1
2
3
Byte
0x30
0x01
0x02
0x01
Definition
4
5
6
7
0xef
0x80
0xfd
0x4b
6.3.2.3.2
Supported Responses
The typical client response is a passing FCS and good thermal data. Under some
conditions, the client’s response will indicate a failure.
Table 6-6.
GetTemp() Response Definition
Response
Meaning
General Sensor Error (GSE)
0x0000
Thermal scan did not complete in time. Retry is appropriate.
Processor is running at its maximum temperature or is currently being
reset.
All other data
Valid temperature reading, reported as a negative offset from the TCC
activation temperature.
6.3.2.4
PCIConfigRd()
The PCIConfigRd() command gives sideband read access to the entire PCI configuration
space maintained in the processor. This capability does not include support for route-
through to downstream devices or sibling processors. The exact listing of supported
devices, functions, and registers can be found in the Intel® Xeon® Processor 7500
Series Datasheet Volume 2. PECI originators may conduct a device/function/register
enumeration sweep of this space by issuing reads in the same manner that BIOS
would. A response of all 1’s indicates that the device/function/register is
unimplemented.
PCI configuration addresses are constructed as shown in the following diagram. Under
normal in-band procedures, the Bus number (including any reserved bits) would be
used to direct a read or write to the proper device. Since there is a one-to-one mapping
between any given client address and the bus number, any request made with a bad
Bus number is ignored and the client will respond with a ‘pass’ completion code but all
0’s in the data. The only legal bus number is 0x00. The client will return all 1’s in the
data response and ‘pass’ for the completion code for all of the following conditions:
• Unimplemented Device
• Unimplemented Function
• Unimplemented Register
Figure 6-13. PCI Configuration Address
31
28 27
20 19
15 14
12 11
0
Reserved
Bus
Device
Function
Register
126
Datasheet Volume 1 of 2
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