87
Thermal Specifications
service any bus requests, and consequently, all bus traffic is blocked. Edge-triggered
interrupts will be latched and kept pending until the processor resumes operation at the
new frequency.
Once the new operating frequency is engaged, the processor will transition to the new
core operating voltage by issuing a new VID code to the voltage regulator. The voltage
regulator must support dynamic VID steps in order to support Intel® Thermal Monitor
2. During the voltage change, it will be necessary to transition through multiple VID
codes to reach the target operating voltage. Each step will be one VID table entry (see
Table 2-3
). The processor continues to execute instructions during the voltage
transition. Operation at the lower voltage reduces the power consumption of the
processor.
A small amount of hysteresis has been included to prevent rapid active/inactive
transitions of the TCC when the processor temperature is near its maximum operating
temperature. Once the temperature has dropped below the maximum operating
temperature, and the hysteresis timer has expired, the operating frequency and
voltage transition back to the normal system operating point. Transition of the VID code
will occur first, in order to insure proper operation once the processor reaches its
normal operating frequency. Refer to
Figure 6-7
for an illustration of this ordering.
The PROCHOT# signal is asserted when a high temperature situation is detected,
regardless of whether Intel® Thermal Monitor 1 or Intel® Thermal Monitor 2 is
enabled.
6.2.2
On-Demand Mode
The processor provides an auxiliary mechanism that allows system software to force
the processor to reduce its power consumption. This mechanism is referred to as “On-
Demand” mode and is distinct from the Intel® Thermal Monitor 1 and Intel® Thermal
Monitor 2 features. On-Demand mode is intended as a means to reduce system level
power consumption. Systems utilizing the Dual-Core Intel® Xeon® Processor 5200
Series must not rely on software usage of this mechanism to limit the processor
temperature. If bit 4 of the IA32_CLOCK_MODULATION MSR is set to a ‘1’, the
processor will immediately reduce its power consumption via modulation (starting and
stopping) of the internal core clock, independent of the processor temperature. When
using On-Demand mode, the duty cycle of the clock modulation is programmable via
Figure 6-7. Intel® Thermal Monitor 2 Frequency and Voltage Ordering
Vcc
Temperature
V
NOM
Frequency
Time
f
TM2
f
MAX
T
TM2
V
TM2
T(hysterisis)
Vcc
Temperature
V
NOM
Frequency
Time
f
TM2
f
MAX
T
TM2
V
TM2
T(hysterisis)
Summary of Contents for L5310 - Cpu Xeon Quad-Core Lv 1.6Ghz Fsb1066Mhz 8M Fc-Lga6 Tray
Page 1: ...318590 005 Dual Core Intel Xeon Processor 5200 Series Datasheet August 2008...
Page 8: ...8 Dual Core Intel Xeon Processor 5200 Series Datasheet...
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Page 92: ...Thermal Specifications 92...
Page 98: ...Features 98...
Page 102: ...Boxed Processor Specifications 102 Figure 8 4 Top Side Board Keepout Zones Part 1...
Page 103: ...103 Boxed Processor Specifications Figure 8 5 Top Side Board Keepout Zones Part 2...
Page 104: ...Boxed Processor Specifications 104 Figure 8 6 Bottom Side Board Keepout Zones...
Page 105: ...105 Boxed Processor Specifications Figure 8 7 Board Mounting Hole Keepout Zones...
Page 106: ...Boxed Processor Specifications 106 Figure 8 8 Volumetric Height Keep Ins...
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