Thermal Specifications
pop-up to C0 varies by product SKU, the C-state from which the pop-up is initiated,
and the negotiated TBIT
.
Table 6-21. Power Impact of PECI Commands vs. C-states
Command
Ping()
Power Impact
Not measurable
GetDIB()
Not measurable
GetTemp()
PCIConfigRd()
PCIConfigWr()
MbxSend()
MbxGet()
Not measurable
Requires a package ‘pop-up’ to a C0 state
Requires a package ‘pop-up’ to a C0 state
Requires a package ‘pop-up’ to a C0 state
Not measurable
6.3.7.5
S-States
The PECI client is always guaranteed to be operational under S0 and S1 sleep states.
Under S3 and deeper sleep states, the PECI client response is undefined and, therefore,
unreliable.
Table 6-22. PECI Client Response During S1
Command
Response
Ping()
Fully functional
Fully functional
Fully functional
Fully functional
Fully functional
Fully functional
Fully functional
GetDIB()
GetTemp()
PCIConfigRd()
PCIConfigWr()
MbxSend()
MbxGet()
6.3.7.6
Processor Reset
The Intel Xeon Processor E7-8800/4800/2800 Product Families processor PECI client is
fully reset on all RESET_N assertions. Upon deassertion of RESET_N, where power is
maintained to the processor (otherwise known as a ‘warm reset’), the following are
true:
• The PECI client assumes a bus Idle state.
• The Thermal Filtering Constant is retained.
• The GetTemp() reading resets to 0x0000.
• Any transaction in progress is aborted by the client (as measured by the client no
longer participating in the response).
• The processor client is otherwise reset to a default configuration.
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Datasheet Volume 1 of 2
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