Datasheet

Thermal Specifications
118 Intel
®
Xeon
®
Processor 5500 Series Datasheet, Volume 1
6.3.2.6.5 Icc-TDC Read
Icc-TDC is the Intel Xeon processor 5500 series TDC current draw specification. This
data may be used to confirm matching Icc profiles of processors in DP configurations. It
may also be used during the processor boot sequence to verify processor compatibility
with motherboard Icc delivery capabilities.
This command returns Icc-TDC in units of 1 Amp.
6.3.2.6.6 TCONTROL Read
TCONTROL is used for fan speed control management. The TCONTROL limit may be
read over PECI using this Mailbox function. Unlike the in-band MSR interface, this
TCONTROL value is already adjusted to be in the native PECI temperature format of a
2-byte, 2’s complement number.
6.3.2.6.7 Thermal Data Config Read / Write
The Thermal Data Configuration register allows the PECI host to control the window
over which thermal data is filtered. The default window is 256 ms. The host may
configure this window by writing a Thermal Filtering Constant as a power of two.
E.g., sending a value of 9 results in a filtering window of 2
9
or 512 ms.
6.3.2.6.8 Machine Check Read
PECI offers read access to processor machine check banks 0, 1, 6 and 8.
Because machine check bank reads must be delivered through the Intel Xeon processor
5500 series Power Control Unit, it is possible that a fatal error in that unit will prevent
access to other machine check banks. Host controllers may read Power Control Unit
errors directly by issuing a PCIConfigRd() command of address 0x000000B0.
Figure 6-20. Thermal Data Configuration Register
43 0
Thermal Filter Const
Reserved
3
1
Figure 6-21. Machine Check Read MbxSend() Data Format
Byte #
Data
0 1 2 3 4
Request Type Data[31:0]
0x0A Bank Index Bank Number Reserved