Electrical Specifications
connect to the rest of the chain unless one of the other components is capable of
accepting an input of the appropriate voltage. Similar considerations must be made for
TCK, TMS, and TRST#. Two copies of each signal may be required with each driving a
different voltage level.
2.10
Mixing Processors
Intel supports and validates dual processor configurations only in which both
processors operate with the same FSB frequency, core frequency, and have the same
internal cache sizes. Mixing components operating at different internal clock
frequencies is not supported and will not be validated by Intel [Note: Processors within
a system must operate at the same frequency per bits [15:8] of the
IA32_FLEX_BRVID_SEL MSR; however this does not apply to frequency transitions
initiated due to thermal events, Enhanced HALT, Enhanced Intel SpeedStep®
Technology transitions, or assertion of the FORCEPR# signal (See Chapter 6, “Thermal
Specifications”)]. Low voltage (LV), mid-voltage (MV) and full-power 64-bit Intel Xeon
processors should not be mixed within a system. Not all operating systems can support
dual processors with mixed frequencies. Intel does not support or validate operation of
processors with different cache sizes. Mixing processors of different steppings but the
same model (as per CPUID instruction) is supported. Details regarding the CPUID
instruction are provided in the AP-485 Intel® Processor Identification and the CPUID
Instruction application note.
2.11
Absolute Maximum and Minimum Ratings
Table 2-9 specifies absolute maximum and minimum ratings. Within functional
operation limits, functionality and long-term reliability can be expected.
At conditions outside functional operation condition limits, but within absolute
maximum and minimum ratings, neither functionality nor long term reliability can be
expected. If a device is returned to conditions within functional operation limits after
having been subjected to conditions outside these limits, but within the absolute
maximum and minimum ratings, the device may be functional, but with its lifetime
degraded depending on exposure to conditions exceeding the functional operation
condition limits.
At conditions exceeding absolute maximum and minimum ratings, neither functionality
nor long-term reliability can be expected. Moreover, if a device is subjected to these
conditions for any length of time then, when returned to conditions within the
functional operating condition limits, it will either not function or its reliability will be
severely degraded.
Although the processor contains protective circuitry to resist damage from static
electric discharge, precautions should always be taken to avoid high static voltages or
electric fields
.
Table 2-9.
Processor Absolute Maximum Ratings
1, 2
Symbol
Parameter
Min
Max
Unit
Notes
V
V
Core voltage with respect to VSS
-0.30
-0.30
1.55
1.55
V
V
CC
TT
FSB termination voltage with respect to
V
SS
T
Processor case temperature
See
See
° C
° C
CASE
Section 6
Section 6
T
Storage temperature
-40
85
3, 4, 5
STORAGE
24
Dual-Core Intel® Xeon® Processor 5000 Series Datasheet
INTEL [ INTEL ]
