Intel Xeon Instruction Manual

Intel®Xeon™ Processor with 512 KB

L2 Cache System Compatibility

Guidelines

Order Number: 298645-001

January 2002

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or oth-

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Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined."

Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising

from future changes to them.

This document contains information on products in the design phase of development. Do not finalize a design with this infor-

mation. Revised information will be published when the product is available. Verify with your local sales office that you have

the latest datasheet before finalizing a design.

The Intel® Xeon™ processor may contain design defects or errors known as errata which may cause the product to deviate

from published specifications. Current characterized errata are available on request.

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Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

Table of Contents

1.0 Revision History.................................................................................. 4

2.0 Introduction......................................................................................... 5

1.1 Audience.......................................................................................... 5

1.2 References ...................................................................................... 5

3.0 Compatibility ....................................................................................... 6

4.0 SM_VCC............................................................................................. 6

5.0 603-Pin Socket Pin Definition Changes.............................................. 6

6.0 VCC Power Sequencing...................................................................... 7

7.0 Power and Signal Levels .................................................................. 10

8.0 VRM 9.0 and VRM 9.1...................................................................... 10

9.0 Core Frequency to System Bus Ratio Determination....................... 10

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

1.0 Revision History

Revision Date Changes

-001 January 2002 Initial Release

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

2.0 Introduction

This document describes the required changes to Intel® Xeon™ processor-based

platforms in order to provide Intel® Xeon™ processor with 512 KB L2 cache compatibility.

The information in this document should be used in conjunction with specifications

presented in the latest version of the Intel® Xeon™ Processor with 512 KB L2 Cache at

1.80 GHz, 2 GHz, and 2.20 GHz Datasheet and Intel® Xeon™ Processor at 1.40 GHz,

1.50 GHz, 1.70 GHz and 2 GHz Datasheet,as well as information provided in other

processor related design guides listed in the References section below. Design decisions

should always be based on information contained in the latest applicable processor

datasheet. For proper and reliable processor operation, the designer must ensure that the

requirements in this guideline are fully satisfied.

2.1 Audience

This document is targeted at the following audience:

•Intel Xeon processor-based system developers who want to ensure system

compatibility with the Intel Xeon processor with 512 KB L2 cache.

2.2 References

Material and concepts available in the following documents may be beneficial when

reading this document:

•Intel® Xeon™ Processor with 512 KB L2 Cache at 1.80 GHz, 2 GHz, and 2.20 GHz

Datasheet

•Intel® Xeon™ Processor at 1.40 GHz, 1.50 GHz, 1.70 GHz and 2 GHz Datasheet

•Intel® Xeon™ Processor and Intel® 860 Chipset Platform Design Guidelines

•VRM 9.0 DC-DC Converter Design Guidelines

•VRM 9.1 DC-DC Converter Design Guidelines

•Dual Intel® Xeon™ Processor Voltage Regulator Down (VRD) Design Guidelines

•Intel® Xeon™ Processor Thermal Design Guidelines

•ATX/ATX12V Power Supply Design Guide (available at http://www.formfactors.org)

•MPS Power Supply: A Server System Infrastructure (SSI) Specification For Midrange

Chassis Power Supplies (available at http://www.ssiforum.org)

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

3.0 Compatibility

Implementing the changes outlined in this document will help assure that an Intel®

Xeon™ processor-based system design will be compatible with the Intel Xeon processor

with 512 KB L2 cache. Compatibility is likely to be ultimately limited by the ability of the

system to supply the required current and to adequately cool the processor.

4.0 SM_VCC

SM_VCC must be connected to the system 3.3 volt power supply since the Intel® Xeon™

processor with 512 KB L2 cache drives the voltage identification (VID) outputs using core

circuitry powered by the SM_VCC supply.

Refer to Section 6.0 for further considerations involving the power sequencing

requirements of SM_VCC

5.0 603-Pin Socket Pin Definition Changes

The Intel® Xeon™ processor with 512 KB L2 cache is mechanically and electrically

compatible with the same 603-pin socket used for the Intel Xeon processor. However, in

order to support the increased frequencies offered by the Intel Xeon processor with 512

KB L2 cache, "Reserved" and "N.C." pins from the original Intel Xeon processor pin

definition have been designated as either VCC or VSS. Intel Xeon processor-based

platforms need to redefine the 603-pin socket pin map as listed in the “New Name”

column of Table 1 to allow compatibility with the Intel Xeon processor with 512 KB L2

cache.

Table 1. 603-Pin Socket Pin-Map Change

Pin Old Name New Name Comment

A30 RSVD VCC Processor Power

A31 RSVD VSS Processor Ground

B4 RSVD VCC Processor Power

B30 RSVD VSS Processor Ground

B31 RSVD VCC Processor Power

C1 RSVD VSS Processor Ground

C30 RSVD VCC Processor Power

C31 RSVD VSS Processor Ground

D1 RSVD VCC Processor Power

D30 RSVD VSS Processor Ground

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

D31 RSVD VCC Processor Power

E1 RSVD VSS Processor Ground

E30 RSVD VCC Processor Power

E31 RSVD VSS Processor Ground

F1 RSVD VCC Processor Power

F30 RSVD VSS Processor Ground

F31 RSVD VCC Processor Power

G1 RSVD VSS Processor Ground

G30 RSVD VCC Processor Power

G31 RSVD VSS Processor Ground

H1 RSVD VCC Processor Power

H30 RSVD VSS Processor Ground

H31 RSVD VCC Processor Power

J1 RSVD VSS Processor Ground

J30 RSVD VCC Processor Power

J31 RSVD VSS Processor Ground

K1 RSVD VCC Processor Power

K30 RSVD VSS Processor Ground

K31 RSVD VCC Processor Power

L1 RSVD VSS Processor Ground

L30 RSVD VCC Processor Power

L31 RSVD VSS Processor Ground

M1 RSVD VCC Processor Power

M30 RSVD VSS Processor Ground

M31 RSVD VCC Processor Power

N1 RSVD VCC Processor Power

N30 RSVD VSS Processor Ground

N31 RSVD VCC Processor Power

P1 RSVD VSS Processor Ground

P30 RSVD VCC Processor Power

P31 RSVD VSS Processor Ground

R1 RSVD VCC Processor Power

R30 RSVD VSS Processor Ground

R31 RSVD VCC Processor Power

T1 RSVD VSS Processor Ground

T30 RSVD VCC Processor Power

T31 RSVD VSS Processor Ground

U1 RSVD VCC Processor Power

Table 1. 603-Pin Socket Pin-Map Change

Pin Old Name New Name Comment

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

6.0 VCC Power Sequencing

As outlined in Section 4.0, a 3.3 volt power supply must be connected to the Intel®

Xeon™ processor with 512 KB L2 cache SM_VCC pins (AE28 & AE29). SM_VCC is the

supply voltage used for the SMBus functions and for the VID output signal circuits. The

VID signals are programmed by Intel during the manufacturing process so that the VRM

output voltage will be set correctly. As indicated in Figure 1, the VID outputs will be valid

within 10 milliseconds after the time at which the 3.3 volt supply reaches 95% of its

nominal value. For a power supply that adheres to the ATX12V power supply design

guidelines, PWR_OK will be generated no less than 100 milliseconds after all of its

outputs reach their respective 95% values (please refer to the document ATX/ATX12V

Power Supply Design Guide). Similarly, for a power supply that adheres to the Server

System Infrastructure (SSI) power supply specification, PWR_OK will be generated no

less than 100 milliseconds after all of its outputs are within their respective regulation

limits (please refer to the document MPS Power Supply: A Server System Infrastructure

(SSI) Specification For Midrange Chassis Power Supplies).PWR_OKmaybeusedto

enable the output of the VRM (VCC) using the OUTEN signal. The VRM PWRGD output,

in conjunction with the rest of the system’s powergood logic, may be used to generate the

U30 RSVD VSS Processor Ground

U31 RSVD VCC Processor Power

V1 RSVD VSS Processor Ground

V30 RSVD VCC Processor Power

V31 RSVD VSS Processor Ground

W1 RSVD VCC Processor Power

W30 RSVD VSS Processor Ground

W31 RSVD VCC Processor Power

Y1 RSVD VSS Processor Ground

Y30 RSVD VCC Processor Power

Y31 RSVD VSS Processor Ground

AA1 RSVD VCC Processor Power

AA30 RSVD VSS Processor Ground

AA31 RSVD VCC Processor Power

AB1 RSVD VSS Processor Ground

AB30 RSVD VCC Processor Power

AB31 RSVD VSS Processor Ground

AC30 RSVD VSS Processor Ground

AC31 RSVD VCC Processor Power

AD30 RSVD VCC Processor Power

AD31 RSVD VSS Processor Ground

Table 1. 603-Pin Socket Pin-Map Change

Pin Old Name New Name Comment

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

PWRGOOD input to the processor. PWR_OK will be deasserted when any output of an

ATX12V-compliant or SSI-compliant power supply falls below regulation limits. It is

important to maintain SM_VCC at any time the output of the VRM is enabled. Driving the

VRM’s OUTEN with the PWR_OK signal will ensure correct sequencing at both power up

and power down.

Figure 1. Voltage Sequence Timing Requirements

VRM

Power

Supply

Processor

VID[4:0]

3.3 VDC

PWR_OK

OUTEN

PWRGD

PWRGOOD

SM_VCC

3.3 VDC/SM_VCC

PWROK

OUTEN

Power Down

3.3 VDC/SM_VCC

PWR_OK /

VID_OUT

OUTEN

VRM

PWRGD

Processor

PWRGOOD

Processor

RESET

T0= 95% 3.3 volt level Power Up

SM_VCC out of

regulation

T0+10mS

> valid p/s voltages + 100 ms

Power Down Warning > 1ms

1ms < T

36 <10ms

System

PWRGD

Logic

...

... VID

VID

Intel® Xeon™ Processor with 512 KB L2 Cache System Compatibility Guidelines

7.0 Power and Signal Levels

The VID for the Intel® Xeon™ processor with 512 KB L2 cache is 1.500 volts compared to

a VID level of 1.700 volts for the Intel Xeon processor. The Intel Xeon processor with 512

KB L2 cache still uses a single core voltage supply (VCC) to supply the termination voltage

(VTT). Table 2 outlines changes to the way AGTL+ signal level specifications are defined

for the Intel Xeon processor with 512 KB L2 cache. The Intel Xeon processor with 512 KB

L2 cache defines the VIH and VIL specifications based on a percentage of the GTLREF

level instead of a fixed voltage offset level. In Table 2, use a value of GTLREF = 2/3*VCC

for both processors. It is important to simulate the system bus to ensure that these levels

are met. Other bus electrical characteristics are expected to be compatible with the Intel®

Xeon™ processor specifications. Refer to the processor datasheets given in Section 2.2

for complete details regarding all processor specifications referenced in this section.

NOTE: These values are for reference only. The latest processor datasheet contains the actual specifications

for the processor. If the specifications in this table conflict with the specifications found in the datasheet,

the datasheet supersedes.

8.0 VRM 9.0 and VRM 9.1

Voltage regulator designs for Intel® Xeon™ processor-based platforms were initially

basedonIntel’sVRM 9.0 DC-DC Converter Design Guidelines. However, to provide

additional VRM high current capability for new platforms, Intel created an updated voltage

regulator design guide entitled VRM 9.1 DC-DC Converter Design Guidelines. Intel Xeon

processor platforms intending to support the Intel Xeon processor with 512 KB L2 cache

are not required to upgrade to VRM 9.1 and may continue to use VRM 9.0 voltage

regulator solutions. However, new platforms should consider implementing VRM 9.1 since

it provides the most recent voltage regulator design guidelines for the Intel Xeon

processor with 512 KB L2 cache.

9.0 Core Frequency to System Bus Ratio Determination

The core frequency to system bus ratio for the Intel® Xeon™ processor is configured by

driving the ratio select signals (LINT[1]/NMI, A20M#, IGNNE#, and LINT[0]/INTR) with

appropriate ratio encoding values during processor power-on reset. The Intel Xeon

processor with 512 KB L2 cache implements a new method for setting the core frequency

to system bus ratio and will ignore the ratio select signals at power-on reset. The Intel

Table 2. AGTL+ Signal Changes

Symbol Intel® Xeon™ Processor Intel® Xeon™ Processor

with 512 KB L2 Cache

VIL Max GTLREF - 0.100 0.90*GTLREF

VIH Min GTLREF + 0.100 1.10*GTLREF

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