15
Quad-Core Intel® Xeon® Processor 5400 Series Electrical Specifications
2
Quad-Core Intel® Xeon®
Processor 5400 Series Electrical
Specifications
2.1
Front Side Bus and GTLREF
Most Quad-Core Intel® Xeon® Processor 5400 Series FSB signals use Assisted
Gunning Transceiver Logic (AGTL+) signaling technology. This technology provides
improved noise margins and reduced ringing through low voltage swings and controlled
edge rates. AGTL+ buffers are open-drain and require pull-up resistors to provide the
high logic level and termination. AGTL+ output buffers differ from GTL+ buffers with
the addition of an active PMOS pull-up transistor to “assist” the pull-up resistors during
the first clock of a low-to-high voltage transition. Platforms implement a termination
voltage level for AGTL+ signals defined as V
TT
. Because platforms implement separate
power planes for each processor (and chipset), separate V
CC
and V
TT
supplies are
necessary. This configuration allows for improved noise tolerance as processor
frequency increases. Speed enhancements to data and address buses have made
signal integrity considerations and platform design methods even more critical than
with previous processor families. Design guidelines for the processor FSB are detailed
in the appropriate platform design guidelines (refer to
Section 1.3
).
The AGTL+ inputs require reference voltages (GTLREF_DATA_MID, GTLREF_DATA_END,
GTLREF_ADD_MID, and GTLREF_ADD_END) which are used by the receivers to
determine if a signal is a logical 0 or a logical 1. GTLREF_DATA_MID and
GTLREF_DATA_END is used for the 4X front side bus signaling group and
GTLREF_ADD_MID and GTLREF_ADD_END is used for the 2X and common clock front
side bus signaling groups. GTLREF_DATA_MID, GTLREF_DATA_END,
GTLREF_ADD_MID, and GTLREF_ADD_END must be generated on the baseboard (See
Table 2-19
for GTLREF_DATA_MID, GTLREF_DATA_END, GTLREF_ADD_MID, and
GTLREF_ADD_END specifications). Refer to the applicable platform design guidelines
for details. Termination resistors (R
TT
) for AGTL+ signals are provided on the processor
silicon and are terminated to V
TT
. The on-die termination resistors are always enabled
on the Quad-Core Intel® Xeon® Processor 5400 Series to control reflections on the
transmission line. Intel chipsets also provide on-die termination, thus eliminating the
need to terminate the bus on the baseboard for most AGTL+ signals.
Some FSB signals do not include on-die termination (R
TT
) and must be terminated on
the baseboard. See
Table 2-8
for details regarding these signals.
The AGTL+ bus depends on incident wave switching. Therefore, timing calculations for
AGTL+ signals are based on flight time as opposed to capacitive deratings. Analog
signal simulation of the FSB, including trace lengths, is highly recommended when
designing a system. Contact your Intel Field Representative to obtain the Quad-Core
Intel® Xeon® Processor 5400 Series signal integrity models, which includes buffer and
package models.
Содержание E5420 - CPU XEON QUAD CORE 2.50GHZ FSB1333MHZ 12M LGA771 HALOGEN FREE TRAY
Страница 1: ...318589 005 Quad Core Intel Xeon Processor 5400 Series Datasheet August 2008 ...
Страница 8: ...8 Quad Core Intel Xeon Processor 5400 Series Datasheet ...
Страница 14: ...14 ...
Страница 106: ...Boxed Processor Specifications 106 Figure 8 4 Top Side Board Keepout Zones Part 1 ...
Страница 107: ...107 Boxed Processor Specifications Figure 8 5 Top Side Board Keepout Zones Part 2 ...
Страница 108: ...Boxed Processor Specifications 108 Figure 8 6 Bottom Side Board Keepout Zones ...
Страница 109: ...109 Boxed Processor Specifications Figure 8 7 Board Mounting Hole Keepout Zones ...
Страница 110: ...Boxed Processor Specifications 110 Figure 8 8 Volumetric Height Keep Ins ...
Страница 111: ...111 Boxed Processor Specifications Figure 8 9 4 Pin Fan Cable Connector For Active CEK Heat Sink ...
Страница 112: ...Boxed Processor Specifications 112 Figure 8 10 4 Pin Base Board Fan Header For Active CEK Heat Sink ...
Страница 116: ...Boxed Processor Specifications 116 ...