Features; Power-On Configuration Options; Clock Control And Low Power States; Power-On Configuration Option Lands - Intel E5205 - Cpu Xeon 1.86Ghz Fsb1066Mhz 6M Lga771 Dual Core Tray Datasheet

Features

7
Features
7.1

Power-On Configuration Options

Several configuration options can be configured by hardware. The Dual-Core Intel®
Xeon® Processor 5200 Series samples its hardware configuration at reset, on the
active-to-inactive transition of RESET#. For specifics on these options, please refer to
Table 7-1.
The sampled information configures the processor for subsequent operation. These
configuration options cannot be changed except by another reset. All external resets
reconfigure the processor, for configuration purposes, the processor does not
distinguish between a "warm" reset (PWRGOOD signal remains asserted) and a
"power-on" reset.
Table 7-1.

Power-On Configuration Option Lands

Output tri state
Execute BIST (Built-In Self Test)
Disable MCERR# observation
Disable BINIT# observation
Symmetric agent arbitration ID
Notes:
1. Asserting this signal during RESET# will select the corresponding option.
2. Address lands not identified in this table as configuration options should not be asserted during RESET#.
Disabling of any of the cores within the Dual-Core Intel® Xeon® Processor 5200 Series
must be handled by configuring the EXT_CONFIG Model Specific Register (MSR). This
MSR will allow for the disabling of a single core per die within the package.
7.2

Clock Control and Low Power States

The Dual-Core Intel® Xeon® Processor 5200 Series supports the Extended HALT state
(also referred to as C1E) in addition to the HALT state and Stop-Grant state to reduce
power consumption by stopping the clock to internal sections of the processor,
depending on each particular state. See
processor low power states. The Extended HALT state is a lower power state than the
HALT state or Stop Grant state.
The Extended HALT state must be enabled via the BIOS for the processor to
remain within its specifications. For processors that are already running at the
lowest bus to core frequency ratio for its nominal operating point, the processor will
transition to the HALT state instead of the Extended HALT state.
The Stop Grant state requires chipset and BIOS support on multiprocessor systems. In
a multiprocessor system, all the STPCLK# signals are bussed together, thus all
processors are affected in unison. When the STPCLK# signal is asserted, the processor
enters the Stop Grant state, issuing a Stop Grant Special Bus Cycle (SBC) for each
processor die. The chipset needs to account for a variable number of processors
asserting the Stop Grant SBC on the bus before allowing the processor to be
transitioned into one of the lower processor power states.
Configuration Option Land Name
SMI#
A3#
A9#
A10#
BR[1:0]#
Figure 7-1 for a visual representation of the
Notes
1,2
1,2
1,2
1,2
1,2
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