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AV8062701048800
Electrical Specifications
Intel
®
Xeon
®
and Intel
®
Core™ Processors For Communications Infrastructure
May 2012
Datasheet - Volume 1 of 2
Document Number: 327405
-
001
115
9.13.1
Input Reference Clock Signal Quality Specifications
Overshoot/Undershoot and Ringback specifications for BCLK/BCLK# are found in
. Overshoot/Undershoot and Ringback specifications for the DDR3 Reference
Clocks are specified by the DIMM.
9.13.2
DDR3 Signal Quality Specifications
Signal Quality specifications for Differential DDR3 Signals are included as part of the
DDR3 DC specifications and DDR3 AC specifications. Various scenarios have been
simulated to generate a set of layout guidelines which are available in the appropriate
platform design guide.
9.13.3
I/O Signal Quality Specifications
Signal Quality specifications for PCIe* Signals are included as part of the PCIe* DC
specifications and PCIe* AC specifications. Various scenarios have been simulated to
generate a set of layout guidelines which are available in the appropriate platform
design guide.
9.14
Overshoot/Undershoot Guidelines
Overshoot (or undershoot) is the absolute value of the maximum voltage above or
below V
SS
. The overshoot/undershoot specifications limit transitions beyond V
CCIO
or
V
SS
due to the fast signal edge rates. The processor can be damaged by single and/or
repeated overshoot or undershoot events on any input, output, or I/O buffer if the
charge is large enough (i.e., if the over/undershoot is great enough). Baseboard
designs which meet signal integrity and timing requirements and which do not exceed
the maximum overshoot or undershoot limits listed in
performance for the lifetime of the processor.
9.14.1
V
CC
Overshoot Specification
When transitioning from a high-to-low current load condition, the processor can
tolerate short transient overshoot events where V
CC
exceeds the HFM_VID voltage.
This overshoot cannot exceed VID + V
OS_MAX.
V
OS_MAX
is the maximum allowable
overshoot above VID. These specifications apply to the processor die voltage as
measured across the V
CC_SENSE
and V
SS_SENSE
lands.
Table 9-25. V
CC
Overshoot Specifications
Symbol
Parameter
Min
Max
Units
Figure
Notes
V
OS_MAX
Magnitude of V
CC
overshoot above VID
-
50
mV
1
T
VCC_OS_MAX
Time duration of V
CC
overshoot above VID
-
10
µs
1
Notes:
1.
For overshoot, SVID is inclusive of the tolerance band (TOL
VCC
) and ripple.