Errata

Specification Update 71

AH75. B0-B3 Bits in DR6 May Not Be Properly Cleared after Code Breakpoint

Problem: B0-B3 bits (breakpoint conditions detect flags, bits [3:0]) in DR6 may not be properly

cleared when the following sequence happens:

1. POP instruction to SS (Stack Segment) selector.

2. Next instruction is FP (Floating Point) that gets FP assist followed by code

breakpoint.

Implication: B0-B3 bits in DR6 may not be properly cleared.

Workaround: None identified.

Status: For the steppings affected, see the Summary Tables of Changes.

AH76. BTM/BTS Branch-From Instruction Address May Be Incorrect for

Software Interrupts

Problem: When BTM (Branch Trace Message) or BTS (Branch Trace Store) is enabled, a software

interrupt may result in the overwriting of BTM/BTS branch-from instruction address by

the LBR (Last Branch Record) branch-from instruction address.

Implication: A BTM/BTS branch-from instruction address may get corrupted for software interrupts.

Workaround: None identified.

Status: For the steppings affected, see the Summary Tables of Changes.

AH77. REP Store Instructions in a Specific Situation May Cause the Processor

to Hang

Problem: During a series of REP (repeat) store instructions a store may try to dispatch to

memory prior to the actual completion of the instruction. This behavior depends on

the execution order of the instructions, the timing of a speculative jump and the

timing of an uncacheable memory store. All types of REP store instructions are

affected by this erratum.

Implication: When this erratum occurs, the processor may live lock and/or result in a system hang.

Workaround: It is possible for BIOS to contain a workaround for this erratum.

Status: For the steppings affected, see the Summary Tables of Changes.

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 96 97

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Table des matières

Models 6472 & 6474

A versatile instrument

New measurement concept

GROUND RESISTIVITY

MEASUREMENT

GROUND POTENTIAL MEASUREMENT

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