Thermal Specifications
94
6.2.5
THERMTRIP# Signal
Regardless of whether or not Intel® Thermal Monitor 1 or Intel® Thermal Monitor 2 is
enabled, in the event of a catastrophic cooling failure, the processor will automatically
shut down when the silicon has reached an elevated temperature (refer to the
THERMTRIP# definition in
Table 5-1
). At this point, the FSB signal THERMTRIP# will go
active and stay active as described in
Table 5-1
. THERMTRIP# activation is independent
of processor activity and does not generate any bus cycles. Intel also recommends the
removal of V
TT
.
6.3
Platform Environment Control Interface (PECI)
6.3.1
Introduction
PECI offers an interface for thermal monitoring of Intel processor and chipset
components. It uses a single wire, thus alleviating routing congestion issues.
Figure 6-8
shows an example of the PECI topology in a system with Quad-Core Intel®
Xeon® Processor 5400 Series. PECI uses CRC checking on the host side to ensure
reliable transfers between the host and client devices. Also, data transfer speeds across
the PECI interface are negotiable within a wide range (2Kbps to 2Mbps). The PECI
interface on the Quad-Core Intel® Xeon® Processor 5400 Series is disabled by default
and must be enabled through BIOS.
6.3.1.1
T
CONTROL
and TCC Activation on PECI-based Systems
Fan speed control solutions based on PECI utilize a T
CONTROL
value stored in the
processor IA32_TEMPERATURE_TARGET MSR. The T
CONTROL
MSR uses the same offset
temperature format as PECI though it contains no sign bit. Thermal management
devices should infer the T
CONTROL
value as negative. Thermal management algorithms
Figure 6-8. Quad-Core Intel® Xeon® Processor 5400 Series PECI Topology
P E C I H o s t
C o n tr o lle r
D o m a in 0
0
x
3
0
D o m a in 1
0
x
3
0
D o m a in 0
0
x
3
1
D o m a in 1
0
x
3
1
P r o c e s s o r
(S o c k e t 0 )
P r o c e s s o r
(S o c k e t 1 )
G 5
G 5
Summary of Contents for E5420 - CPU XEON QUAD CORE 2.50GHZ FSB1333MHZ 12M LGA771 HALOGEN FREE TRAY
Page 1: ...318589 005 Quad Core Intel Xeon Processor 5400 Series Datasheet August 2008 ...
Page 8: ...8 Quad Core Intel Xeon Processor 5400 Series Datasheet ...
Page 14: ...14 ...
Page 106: ...Boxed Processor Specifications 106 Figure 8 4 Top Side Board Keepout Zones Part 1 ...
Page 107: ...107 Boxed Processor Specifications Figure 8 5 Top Side Board Keepout Zones Part 2 ...
Page 108: ...Boxed Processor Specifications 108 Figure 8 6 Bottom Side Board Keepout Zones ...
Page 109: ...109 Boxed Processor Specifications Figure 8 7 Board Mounting Hole Keepout Zones ...
Page 110: ...Boxed Processor Specifications 110 Figure 8 8 Volumetric Height Keep Ins ...