BIOS Initialization Intel® Server System S7000FC4UR
Revision 1.0
104
14.1.16 Snoop Filter
The chipset, in conjunction with the processor, supports the snoop filter feature. The snoop filter
stores tags and coherency information for all cache lines. The snoop filter is used to determine if
a cache line associated with an address is cached, and if so, where.
14.1.17 Platform Environmental Control Interface (PECI)
PECI is a new thermal management interface. It uses a wire bus interface to provide a
communication channel between an Intel processor and an external monitoring device (PECI
host controller). The PECI host controller for this system is the ADT7490*. The processors
provide processor temperature via PECI interface. The PECI feature configuration and support
is controlled via the processor PECI_CTL MSR register (Offset 5A0h Bit0).
Installed processors must support PECI. The BIOS polls all installed processors for PECI
support. If this is true then the BIOS enables PECI by setting the PECI_CTL MSR Bit 0.
14.1.17.1 Processor Temperature Monitoring and Management
BMC firmware monitors and manages the processor temperature and enables the PECI polling
circuitry.
14.1.17.2 Physical Layer Topology
The server system PECI physical layer topology supports a 4-way symmetric multi-processor
system. PECI devices are identified by their unique, fixed address. All processor PECI devices
are located in the address range of 0x30 to 0x33.
The following figure shows an example implementation. More PECI implementation information,
including platform topologies, commands, and address values, is in the Platform Environment
Control Interface (PECI) Specification.
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