Datasheet
Interfaces
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 February 2010
80 Order Number: 323103-001
2.2.2.6.5 Icc-TDC Read
Icc-TDC is the Intel
®
Xeon
®
processor C5500/C3500 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.
2.2.2.6.6 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.
2.2.2.6.7 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.
2.2.2.6.8 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 C5500/C3500 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 23. Thermal Data Configuration Register
43 0
Thermal Filter Const
Reserved
3
1
Figure 24. Machine Check Read MbxSend() Data Format
Byte #
Data
0 1 2 3 4
Request Type Data[31:0]
0x0A Bank Index Bank Number Reserved