Intel E5472 Data Sheet - Page 15

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.

Section	Page
Quad-Core Intel® Xeon® Processor 5400 Series	1
1 Introduction	9
1.1 Terminology	10
1.2 State of Data	13
1.3 References	13
2 Quad-Core Intel® Xeon® Processor 5400 Series Electrical Specifications	15
2.1 Front Side Bus and GTLREF	15
2.2 Power and Ground Lands	16
2.3 Decoupling Guidelines	16
2.3.1 VCC Decoupling	16
2.3.2 VTT Decoupling	16
2.3.3 Front Side Bus AGTL+ Decoupling	16
2.4 Front Side Bus Clock (BCLK[1:0]) and Processor Clocking	17
2.4.1 Front Side Bus Frequency Select Signals (BSEL[2:0])	17
2.4.2 PLL Power Supply	18
2.5 Voltage Identification (VID)	18
2.6 Reserved, Unused, and Test Signals	21
2.7 Front Side Bus Signal Groups	22
2.8 CMOS Asynchronous and Open Drain Asynchronous Signals	24
2.9 Test Access Port (TAP) Connection	24
2.10 Platform Environmental Control Interface (PECI) DC Specifications	24
2.10.1 DC Characteristics	24
2.10.2 Input Device Hysteresis	25
2.11 Mixing Processors	26
2.12 Absolute Maximum and Minimum Ratings	26
2.13 Processor DC Specifications	27
2.13.1 Flexible Motherboard Guidelines (FMB)	27
2.13.2 VCC Overshoot Specification	38
2.13.3 Die Voltage Validation	39
2.14 AGTL+ FSB Specifications	39
3 Mechanical Specifications	43
3.1 Package Mechanical Drawings	43
3.2 Processor Component Keepout Zones	47
3.3 Package Loading Specifications	47
3.4 Package Handling Guidelines	48
3.5 Package Insertion Specifications	48
3.6 Processor Mass Specifications	48
3.7 Processor Materials	48
3.8 Processor Markings	48
3.9 Processor Land Coordinates	49
4 Land Listing	51
4.1 Quad-Core Intel® Xeon® Processor 5400 Series Pin Assignments	51
4.1.1 Land Listing by Land Name	51
4.1.2 Land Listing by Land Number	61
5 Signal Definitions	71
5.1 Signal Definitions	71
6 Thermal Specifications	79
6.1 Package Thermal Specifications	79
6.1.1 Thermal Specifications	79
6.1.2 Thermal Metrology	90
6.2 Processor Thermal Features	90
6.2.1 Intel® Thermal Monitor Features	90
6.2.2 On-Demand Mode	92
6.2.3 PROCHOT# Signal	93
6.2.4 FORCEPR# Signal	93
6.2.5 THERMTRIP# Signal	94
6.3 Platform Environment Control Interface (PECI)	94
6.3.1 Introduction	94
6.3.2 PECI Specifications	96
7 Features	97
7.1 Power-On Configuration Options	97
7.2 Clock Control and Low Power States	97
7.2.1 Normal State	98
7.2.2 HALT or Extended HALT State	98
7.2.3 Stop-Grant State	100
7.2.4 Extended HALT Snoop or HALT Snoop State, Stop Grant Snoop State	101
7.3 Enhanced Intel SpeedStep® Technology	101
8 Boxed Processor Specifications	103
8.1 Introduction	103
8.2 Mechanical Specifications	105
8.2.1 Boxed Processor Heat Sink Dimensions (CEK)	105
8.2.2 Boxed Processor Heat Sink Weight	113
8.2.3 Boxed Processor Retention Mechanism and Heat Sink Support (CEK)	113
8.3 Electrical Requirements	113
8.3.1 Fan Power Supply (Active CEK)	113
8.3.2 Boxed Processor Cooling Requirements	114
8.4 Boxed Processor Contents	115
9 Debug Tools Specifications	117
9.1 Debug Port System Requirements	117
9.2 Target System Implementation	117
9.2.1 System Implementation	117
9.3 Logic Analyzer Interface (LAI)	117
9.3.1 Mechanical Considerations	118

Intel E5472 Data Sheet - Page 15

Quad-Core Intel® Xeon®, Processor 5400 Series Electrical, Specifications

Page 15 highlights