AMD ATHLON K Istruzioni per l’uso

AMD Athlon™ Processor Model 4

Revision Guide

Publication # 23614 Rev: K

Issue Date: October 2003

Preliminary Information

Trademarks

AMD, the AMD Arrow logo, AMD Athlon, AMD Duron, and combinations thereof, AMD-751, and AMD-756 are

trademarks of Advanced Micro Devices, Inc.

Other product names used in this publication are for identification purposes only and may be trademarks of

their respective companies.

The contents of this document are provided in connection with Advanced

Micro Devices, Inc. (“AMD”) products. AMD makes no representations or

warranties with respect to the accuracy or completeness of the contents of

this publication and reserves the right to make changes to specifications and

product descriptions at any time without notice. No license, whether express,

implied, arising by estoppel or otherwise, to any intellectual property rights

is granted by this publication. Except as set forth in AMD’s Standard Terms

and Conditions of Sale, AMD assumes no liability whatsoever, and disclaims

any express or implied warranty, relating to its products including, but not

limited to, the implied warranty of merchantability, fitness for a particular

purpose, or infringement of any intellectual property right.

The AMD products described herein may contain design defects or errors

(“Product Errata”) that cause AMD products to deviate from published

specifications. Currently characterized Product Errata may be available upon

request.

AMD’s products are not designed, intended, authorized or warranted for use

as components in systems intended for surgical implant into the body, or in

other applications intended to support or sustain life, or in any other

application in which the failure of AMD’s product could create a situation

where personal injury, death, or severe property or environmental damage

may occur. AMD reserves the right to discontinue or make changes to its

products at any time without notice.

23614K —October 2003 AMD Athlon™ Processor Model 4 Revision Guide

Preliminary Information

Revision History

Date Rev Description

October 2003 K Revised erratum #24.

June 2003 J Added erratum #24.

December 2002 I Added errata #21–23.

July 2002 H Added erratum #20.

March 2002 G Added erratum #17.

April 2001 F Removed OPN information. Added errata items 13, 14, 15, 16. Added information on silicon

revision A9.

AMD Athlon™ Processor Model 4 Revision Guide 23614K —October 2003

Preliminary Information

AMD Athlon™ Processor Model 4

Revision Guide

The purpose of the AMD Athlon™ Processor Model 4 Revision Guide is to communicate updated product

information on the AMD Athlon™ processor model 4 to designers of computer systems and software

developers. This guide consists of three sections:

■Product Errata: This section, which starts on page 5, provides a detailed description of product

errata, including potential effects on system operation and suggested workarounds. An erratum is

defined as a deviation from the product’s specification. A product errata may cause the behavior of

the AMD Athlon™ Processor Model 4 to deviate from published specifications.

■Revision Determination: This section, which starts on page 20, shows the AMD Athlon processor

model 4 identification numbers returned by the CPUID instruction for each revision of the

processor.

■Technical and Documentation Support: This section, which starts on page 21, provides a listing of

available technical support resources. It also lists corrections, modifications, and clarifications to

listed documents. Please refer to the data sheets listed in this section for product marking

information.

Revision Guide Policy

Occasionally AMD identifies deviations from or changes to the specification of the AMD Athlon

processor model 4. These changes are documented in the AMD Athlon™ Processor Model 4 Revision

Guide as errata. Descriptions are written to assist system and software designers in using the AMD

Athlon processor model 4 and corrections to AMD’s documentation on the AMD Athlon processor

model 4 are included. This release documents currently characterized product errata, but is not

intended to identify all errata in the processor.

23614K —October 2003 AMD Athlon™ Processor Model 4 Revision Guide

Preliminary Information

1 Product Errata

This section documents AMD Athlon processor model 4 product errata. The errata are divided into

categories to assist referencing particular errata. A unique tracking number for each erratum has been

assigned within this document for user convenience in tracking the errata within specific revision

levels. Table 1 cross-references the revisions of the processor to each erratum. An “X” indicates that

the erratum applies to the stepping. The absence of an “X” indicates that the erratum does not apply

to the stepping. Shading within the table indicates an addition or modification from the previous

release of this document.

Note: There can be missing errata numbers. Errata that have been resolved from early revisions of the

processor have been deleted, and errata that have been reconsidered may have been deleted or

renumbered.

Table 1. Cross-Reference of Product Revision to Errata

Errata Numbers and Description Revision Numbers

A4 A5 A6 A7 A9

5MCABusUnitControlRegisterMSR408HReturnsIncorrectInformation XXXXX

10 Resistance Value of the ZN and ZP Pins X X

11 PLL Overshoot on Wake-Up from Disconnect Causes Auto-Compensation

Circuit to Fail XXXXX

13InstructionExecutionDeadlock XXXX

14 Processors with Half-Frequency Multipliers May Hang Upon Wake-up from

Disconnect XXXXX

15 Processor Does Not Support Reliable Microcode Patch Mechanism X

16 INVLPG Instruction Does Not Flush Entire Four-Megabyte Page Properly with

Certain Linear Addresses XXXXX

17 Code Modifications that Coincide with Level 2 Instruction TLB Translations

May Escape Detection Resulting in Stale Code Execution XXXXX

20 A Speculative SMC Store Followed by an Actual SMC Store May Cause One-

Time Stale Execution XXXXX

21 Real Mode RDPMC with Illegal ECX May Cause Unpredictable Operation XXXXX

22UsingTaskGatesWithBreakpointsEnabledMayCauseUnexpectedFaultsXXXXX

23SingleStepAcrossI/OSMISkipsOneDebugTrap XXXXX

24 Software Prefetches May Report A Page Fault XXXXX

AMD Athlon™ Processor Model 4 Revision Guide 23614K—October 2003

Preliminary Information

5 MCA Bus Unit Control Register MSR 408H Returns Incorrect Information

Products Affected. A4, A5, A6, A7, A9

Normal Specified Operation. System reads to MSR 408h, MCA Bus Unit Control Register MC2_CTL, should

return correct information—the lower 32 bits in EAX and all zeros for the upper 32 bits in EDX.

Non-conformance. A read to the Machine Check Architecture (MCA) Bus Unit Control MSR 408h

(MC2_CTL) returns incorrect information in EDX. It returns the information stored in the upper 32

bits of the BU Status MSR 409h (MC2_STATUS) instead.

Potential Effect on System. If the system reads this MCA control register, the upper 32 bits, which are

reported in EDX, can contain unexpected data.

Suggested Workaround. This register is only implemented as a 32-bit register. Ignore the upper 32 bits

which are reported in EDX.

Resolution Status. No fix planned.

23614K —October 2003 AMD Athlon™ Processor Model 4 Revision Guide

Preliminary Information

10 Resistance Value of the ZN and ZP Pins

Products Affected. A4, A5

Normal Specified Operation. The ZN and ZP pins are specified such that the AMD system bus output

drivers autocompensate to whatever resistance value is applied between ZN and VDD and ZP and

VSS.

Non-conformance. The AMD system bus driver impedance is approximately 20 ohms higher than the

applied resistor value.

Potential Effect on System. The AMD Athlon system bus signal quality for signals driven to the

Northbridge may be adversely affected.

Suggested Workaround. All motherboards should have ZN/ZP resistors set to approximately 20 ohms less

than the characteristic board impedance.

Resolution Status. Fix planned for a future revision.

Note: When future revisions of the processor are used with motherboards implementing the workaround,

the expected output impedance of the driver will continue to yield good signal quality. (For example,

with a motherboard setting of 40 ohms for ZN and ZP, an old part that drives with a 60-ohm driver

works properly. A revised part with a true 40-ohm driver also works properly.)

AMD Athlon™ Processor Model 4 Revision Guide 23614K—October 2003

Preliminary Information

11 PLL Overshoot on Wake-Up from Disconnect Causes Auto-Compensation Circuit to Fail

Products Affected. A4, A5, A6, A7, A9

Normal Specified Operation. The AMD Athlon processor model 4 PLL should return to the normal

operating frequency when reconnecting to the system bus after a disconnect where the PLL was

reduced to a lower operating frequency.

Non-conformance. The AMD Athlon processor model 4 PLL can exceed the normal operating frequency

when reconnecting to the system bus after a disconnect, causing a failure to maintain sufficient system

bus I/O drive strength levels in the driver compensation circuit. The compensation circuit attempts to

correct the drive strength, but if there is not sufficient time to perform this function, the system bus

cannot operate properly.

Potential Effect on System. The system hangs.

Suggested Workaround. The event can be avoided through BIOS manipulation of the reconnect timing

using the CLK_CTRL MSR. (See AMD Athlon™ and AMD Duron™ Processor CLK_CTRL MSR Settings,

order# 24478, for exact values.)

The time for the PLL to overshoot can be greatly shortened to reduce it to a very small time period that

does not enable the failure, and the time between the rampup and the reconnect to the system bus can

be increased such that a failure in the compensation circuit has enough time to recover before

reconnecting to the bus.

Resolution Status. Fix planned for a future revision.

23614K —October 2003 AMD Athlon™ Processor Model 4 Revision Guide

Preliminary Information

13 Instruction Execution Deadlock

Products Affected. A4, A5, A6, A7

Normal Specified Operation. Legitimate instruction sequences should execute as specified.

Non-conformance. Under rare and unlikely conditions, the load-store unit, instruction scheduler and

effective address generation unit interact in such a way that deadlock a occurs, preventing further

instruction execution.

Potential Effect on System. The system hangs. No instructions complete and the processor will not respond

to interrupts.

Suggested Workaround. None.

Resolution Status. Fix planned for a future revision.

AMD Athlon™ Processor Model 4 Revision Guide 23614K—October 2003

Preliminary Information

14 Processors with Half-Frequency Multipliers May Hang Upon Wake-up from Disconnect

Products Affected. A4, A5, A6, A7, A9

Normal Specified Operation. The processor should reconnect to the system bus upon wake-up after a

disconnect while in the C2 and C3 ACPI low-power states.

Non-conformance. The processor uses a special circuit to wake up from a low-power state and reconnect

to the system bus when the nominal operating frequency is generated with a half-frequency multiplier.

This circuit is rarely observed to glitch when coming out of the C2 and C3 low-power states.

Potential Effect on System. The system will hang.

Suggested Workaround. Do not use the C2 or C3 ACPI states on processors that run at a nominal operating

frequency generated with a half-frequency multiplier. This can be accomplished by having the BIOS

not declare C2 or C3 support to the operating system in the Fixed ACPI Description Table (FADT).

Resolution Status. Fix planned for a future revision.

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