Guidelines

Dual-Core Intel
®
Xeon
®
Processor 7000 Sequence Thermal /Mechanical Guidelines 17
Thermal Mechanical Design
2.2.2.2 Fan Speed Control for Dual Core
The SMBus thermal sensor will move to a two-channel model for dual core processors. There will
be no hardware changes to the SMBus on the platform, but the software will need to be modified to
read the 2nd channel. Figure 2-5 provides an illustration of the fan speed signal for the Dual-Core
Intel Xeon processor 7000 sequence.
2.2.2.3 PROCHOT#, THERMTRIP#, and FORCEPR#
The PROCHOT# and THERMTRIP# outputs will be shared by each core. The first core to reach
TCC activation will assert PROCHOT#. A signal FORCEPR# input will be shared by each core.
Table 2-2 provides an overview of input and output conditions for the dual core processor thermal
management features.
Figure 2-4. Fan Speed Control Dual Core
Table 2-2. Input and Output Conditions for Dual Core Thermal Management (Sheet 1 of 2)
Item
Input Output
Core1 Core2 Core1 Core2
TM1
TCC TCC
TCC TCC
TCC TCC TCC TCC
TM2
TCC TCC TCC
TCC TCC TCC
TCC TCC TCC TCC
PROCHOT#
TCC
PROCHOT# AssertedTCC
TCC TCC