Intel AT80604004881AA User Manual
Thermal Specifications
144
Intel® Xeon® Processor 7500 Datasheet, Volume 1
6.3.6.4
Reserved Values
Several values well out of the operational range are reserved to signal temperature
sensor errors. These are summarized in the following table:
sensor errors. These are summarized in the following table:
6.3.7
Client Management
6.3.7.1
Power-up Sequencing
The PECI client is fully reset during processor RESET_N assertion. This means that any
transactions on the bus will be completely ignored, and the host will read the response
from the client as all zeroes. After processor RESET_N deassertion, the Intel® Xeon®
processor 7500 series PECI client is operational enough to participate in timing
negotiations and respond with reasonable data. However, the client data is not
guaranteed to be fully populated until approximately 500 µS after processor RESET_N
is deasserted. Until that time, data may not be ready for all commands. Note that, PECI
commands may time out frequently during boot. The client responses to each
command are as follows:
transactions on the bus will be completely ignored, and the host will read the response
from the client as all zeroes. After processor RESET_N deassertion, the Intel® Xeon®
processor 7500 series PECI client is operational enough to participate in timing
negotiations and respond with reasonable data. However, the client data is not
guaranteed to be fully populated until approximately 500 µS after processor RESET_N
is deasserted. Until that time, data may not be ready for all commands. Note that, PECI
commands may time out frequently during boot. The client responses to each
command are as follows:
In the event that the processor is tri-stated using power-on-configuration controls, the
PECI client will also be tri-stated. Processor tri-state controls are described in
PECI client will also be tri-stated. Processor tri-state controls are described in
.
Table 6-20. Error Codes and Descriptions
Error Code
Description
0x8000
General Sensor Error (GSE)
Table 6-21. PECI Client Response During Power-Up (During ‘Data Not Ready’)
Command
Response
Ping()
Fully functional
GetDIB()
Fully functional
GetTemp()
Client responds with a ‘hot’ reading, or 0x0000
PCIConfigRd()
Fully functional
PCIConfigWr()
Fully functional
MbxSend()
Fully functional
MbxGet()
Client responds with Abort FCS (if MbxSend() has been previously issued)