VITA46.0标准发布：VPX基础架构的最新修订

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VITA46.0标准，全称为"American National Standard for VPX Baseline Standard"，由ANSI（美国国家标准协会）和VITA（VMEbus国际贸易协会）联合发布，最初于2007年10月批准，版本号为R1.0。此标准是针对VPX（Virtual Platform eXtensions，虚拟平台扩展）技术的基础规范，旨在为嵌入式系统提供一个开放的标准平台，以便于模块化、可扩展的设计和互操作性。 VPX是构建高性能、灵活和可重构系统架构的一种方法，它允许硬件和软件组件以模块化方式运行在标准的工业标准硬件上。VITA46.0定义了VPX平台的基本框架，包括硬件接口、通信协议、电源管理、散热、系统配置以及调试与测试等方面的要求。该标准借鉴了VITA40标准中的Status Indicator部分，并在后续的修订中进行了相应的修正和改进。在2008年2月的R1.1版本中，主要纠正了几个附录B中的图形错误；同年4月的R1.2版中，对第25页的建议3-6进行了文本修正，将引用的VITA40标准改为更具明确性的"ANSI/VITA40, Status Indicator Standard"。2012年9月发布的R2.0版本对应ANSI修订投票的结果，包含了从VITA65等其他标准中采纳的变更、勘误和编辑修订。值得注意的是，2013年5月的R2.0a版本对文档格式进行了微调，修正了第三级目录编号问题，统一采用从0开始的编号格式，例如之前的7.3.0应更正为7.3.1。这一修订确保了标准的精确性和一致性，使得所有遵循VITA46.0的VPX产品都能满足高质量的工程实践。 VITA46.0标准对于从事VPX技术开发的工程师、系统集成商和制造商来说，是一项重要的参考依据，它规定了VPX系统设计、实现和测试的通用准则，促进了整个行业的标准化进程和技术创新。随着技术的发展和需求的变化，VITA46.0可能会继续进行更新和完善，以适应不断演进的IT环境。

ANSI/VITA 46.0, VPX Baseline Standard

Page 16

At the time of publication the following protocol standards had been defined. Please consult

VITA for a current list.

Specification

Title

Status (at time of revision)

VITA 46.0

VPX Base Standard

ANSI approved

VITA 46.1

VMEbus Signal Mapping on VPX

ANSI approved

VITA 46.3

Serial RapidIO™ on VPX Fabric Connector

ANSI approved

VITA 46.4

PCI Express on VPX Fabric Connector

ANSI approved

VITA 46.6

Gbit Ethernet Control Plane on VPX

ANSI recirculation

VITA 46.7

Ethernet on VPX Fabric Connector

ANSI approved

VITA 46.8

Infiniband on VPX Fabric Connector

VDSTU (Trial Use)

VITA 46.9

PMC/XMC Rear I/O Fabric Signal Mapping on

3U and 6U VPX Modules

ANSI approved

VITA 46.10

Rear Transition Module for VPX

ANSI approved

VITA 46.11

System Management on VPX

Working Group

VITA 46.12

Fibre Optic Interface on VPX

Redesignated as VITA 66

VITA 46.14

Analog/RF Interconnect on VPX

Redesignated as VITA 67

VITA 46.20

VPX Switch Slot Definition

Moved to VITA 65

VITA 46.21

Distributed Switching on VPX

Moved to VITA 65

The VITA 46.0 base standard includes features drawn from IEEE 1101.1 and IEEE 1101.2 (for

air cooled and conduction cooled plug-in modules, respectively). These features are evident in

the mechanical drawings provided.

The VITA 46 base standard defines physical features that enable high-speed communication in a

compliant system. These features include: a 6U by 160mm by 4HP pitch Eurocard format board

with high speed differential connectors, a 6U by 160mm by 4HP pitch Eurocard format board

with a combination of high speed differential and single-ended connectors, and the

backplane/chassis infrastructure needed to support these features. The base standard also defines

similar physical features for 3U by 160mm by 4HP pitch Eurocard format, providing the same

two types of connector options discussed above for 6U plug-in modules. Many features called

for in the base specification will be compatible with the requirements of other standards, such as

VITA-48, but this standard concerns only the IEEE 1101 compatible applications.

This base standard also defines alignment and keying features used to protect the connector

system.

The base standard does not address the possible serial fabric configurations available in systems

which utilize the standard.

While the base standard does not address the use of ANSI/VITA-1.1 or VITA-41 plug-in

modules, or modules which are constructed to the mechanical requirements of VITA-48, chassis

and backplanes can be constructed which provide compatibility with plug-in modules built to

these standards. The dot specifications allow the use of the single-ended connector allocation for

ANSI/VITA 46.0, VPX Baseline Standard

Page 17

parallel busses, such as VME or PCI, completing the compatibility between older standards and

this one.

1.3 Terminology

1.3.1 Specification Key Words

To avoid confusion and to make very clear what the requirements for compliance are, many of

the paragraphs in this standard are labeled with keywords that indicate the type of information

they contain. These keywords are listed below:

Rule

Recommendation

Suggestion

Permission

Observation

Any text not labeled with one of these keywords can be interpreted as descriptive in nature.

These will be written in either a descriptive or a narrative style.

The keywords are used as follows:

Rule <chapter>-<number>:

Rules form the basic framework of this standard. They are sometimes expressed in text form and

sometimes in the form of figures, tables or drawings. All rules shall be followed to ensure

compatibility between board and backplane designs. All rules use the “shall” or “shall not”

words to emphasize the importance of the rule. The “shall” or “shall not” words are reserved

exclusively for stating rules in this standard and are not used for any other purpose.

Recommendation <chapter>-<number>:

Wherever a recommendation appears, designers would be wise to take the advice given. Doing

otherwise might result in poor performance or awkward problems. Recommendations found in

this standard are based on experience and are provided to designers to speed their traversal of the

learning curve. All recommendations use the “should” or “should not” words to emphasize the

importance of the recommendation. The “should” or “should not” words are reserved exclusively

for stating recommendations in this standard and are not used for any other purpose.

Suggestion <chapter>-<number>:

A suggestion contains advice, which is helpful but not vital. The reader is encouraged to consider

the advice before discarding it. Some design decisions that need to be made are difficult until

experience has been gained. Suggestions are included to help a designer who has not yet gained

this experience.

ANSI/VITA 46.0, VPX Baseline Standard

Page 18

Permission <chapter>-<number>:

In some cases a rule does not specifically prohibit a certain design approach, but the reader might

be left wondering whether that approach might violate the spirit of the rule or whether it might

lead to some subtle problem. Permissions reassure the reader that a certain approach is

acceptable and will cause no problems. All permissions use the “may” words to emphasize the

importance of the permission. The lower-case “may” words are reserved exclusively for stating

permissions in this standard and are not used for any other purpose.

Observation <chapter>-<number>:

Observations do not offer any specific advice. They usually follow naturally from what has just

been discussed. They spell out the implications of certain rules and bring attention to things that

might otherwise be overlooked. They also give the rationale behind certain rules so that the

reader understands why the rule must be followed.

1.3.2 VITA 46 Definitions

The following terms are used within the body of the specification. In this context, they have the

following meanings.

Term

Definition

2-level maintenance (Two

Level Maintenance)

A maintenance system where plug in modules are the field

replaceable units; a subset of whose requirements are that

the module provides both mechanical and ESD protection.

Air cooled

a plug-in module which is intended to have heat removed

by transfer to an air stream flowing over the module

Chassis Ground

See Safety Ground.

Conduction cooled

a plug-in module which is intended to have heat removed

by transfer to the chassis through mechanical contact with a

chassis component

Dedicated System

A system designed for a single use or application; not

available to general users. Such a system will usually

embody a feature which precludes full compliance with this

standard.

Differential Wafer

A wafer designed for the connection of high speed (up to 5

GBaud) signaling intended for use with differential pair

signals, such as LVDS.

ESD

Electrostatic discharge.

Ground

Unless otherwise specified the term Ground means logic

ground or signal ground, not safety ground. Also referred to

as RF Ground. See Safety Ground and RF Ground.

Horizontal Pitch of 5.08 mm or 0.2 inch (see IEEE 1101.1-

1998). Thus 4HP = 0.8 inch pitch.

MultiGig RT2 7-Row

A family of connectors, or their equivalent, used in VITA

46 systems for high speed interconnections.

Power Wafer

A wafer providing two contacts which are intended to be

ANSI/VITA 46.0, VPX Baseline Standard

Page 19

Term

Definition

used to supply prime power to a plug-in module.

RF Ground

A distributed low impedance common reference between

plug-in module circuitry/shields and other electrical

equipment (rack, other plug-in modules, and power

sources). See Safety Ground and Ground.

Safety Ground

Plug-in module features, including ground path and

components that ensure hazardous voltages are not present

on accessible hardware under single fault conditions. See

Ground and RF Ground.

Single-ended (SE) wafer

A single-ended wafer providing five signal contacts and

two ground contacts

VME Board

A plug-in module that complies with the ANSI/VITA-1.1,

VME64 Extensions standard.

Notation representing Prime Power from the system to the

plug-in module.

VPX

The name given for the family of VITA 46 specifications

VXS

A VMEbus Switched Serial (VITA-41) payload module

1.4 References

The following publications are referenced in conjunction with this standard.

Permission 1-1: The following documents, of the exact issues shown, contain provisions that

through reference in this text constitute provisions of this standard to the extent specified herein.

Additionally, more recent issues of applicable documents may be used provided performance,

including reliability and cost, are not adversely affected.

The following standards are available from the VMEbus International Trade Association.

http://www.vita.com

ANSI/VITA-1-2002 VME64

ANSI/VITA-1.1-1997 VME64 Extensions

ANSI/VITA 38-2003 System Management for VME

ANSI/VITA 47-2005 Environments, Design and Construction, Safety, and Quality for Plug-In

Units

The following are available from their respective owners:

IEC 512-3-1976 Electromechanical Components for Electronic Equipment; Basic Testing

Procedures and Measuring Methods

IEC 60950-1:2001, Information Technology Equipment - Safety – Part 1: General Requirements.

IEEE 1101.1-1998, IEEE Standards for Mechanical Core Specifications for Microcomputers

Using IEC 603-2 Connectors

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