Intel L5520 AT80602000810AA User Manual

130

Intel

®

 Xeon

®

 Processor 5500 Series Datasheet, Volume 1

• MbxSend(), PCIConfigRd() and PCIConfigWr() usage under package C-states may 

result in increased power consumption because the processor must temporarily 
return to a C0 state in order to execute the request. The exact power impact of a 
pop-up to C0 varies by product SKU, the C-state from which the pop-up is initiated, 
and the negotiated T

BIT

.

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.

The Intel Xeon processor 5500 series PECI client is fully reset on all RESET# assertions. 
Upon deassertion of RESET#, 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.
• PECI Node ID is retained.
• 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.

Ping()

Not measurable

GetDIB()

Not measurable

GetTemp()

Not measurable

PCIConfigRd()

Requires a package ‘pop-up’ to a C0 state

PCIConfigWr()

Requires a package ‘pop-up’ to a C0 state

MbxSend()

Requires a package ‘pop-up’ to a C0 state

MbxGet()

Not measurable

Ping()

Fully functional

GetDIB()

Fully functional

GetTemp()

Fully functional

PCIConfigRd()

Fully functional

PCIConfigWr()

Fully functional

MbxSend()

Fully functional

MbxGet()

Fully functional