VITA46标准：VPX基线规范在恶劣环境应用中的关键接口进化

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VITA46标准是美国电气与电子工程师学会（American National Standards Institute, ANSI）与VMEbus国际贸易协会（VMEbus International Trade Association）联合制定的一项关键标准，其全称为"ANSI/VITA46.0-2007: VPX Baseline Standard"。这个标准于2007年10月获得批准，标志着在严苛环境应用中提供高速互连技术的重大进步。VITA46标准旨在规范VPX（VersaModule Eurocard，可变模块式欧式卡）平台，这是一种高性能、模块化的系统架构，广泛应用于航空、航天、军事和工业自动化等领域。 Vita46标准的核心内容包括对VPX硬件和软件设计的基础规定，涵盖了系统架构、信号完整性、电源管理、散热、环境适应性和安全性等方面的要求。它建立了一个通用的接口规范，使得不同制造商生产的VPX模块能够无缝协作，提高了系统的可靠性和互操作性。该标准经历了多个修订版本，如R1.0初始发布在2007年10月，主要解决了一些初期错误并更新了相关图表。到了2008年2月的R1.1版本，着重修正了文档中的错误，特别是附录B中的图B-1至B-4。而在同年4月发布的R1.2版本中，对文档内容进行了进一步细化，将推荐3-6中的引用从"ANSI-VITA40-2004"更改为"ANSI/VITA40, Status Indicator Standard"，体现了标准之间的继承和发展关系。 VITA46标准的批准对于推动VPX技术在工业4.0、物联网和云计算等前沿技术的应用起到了重要作用，确保了系统设计的标准化和一致性，从而降低了集成成本，提高了整个系统的效能和稳定性。此外，标准还强调了在恶劣环境下工作的能力，如温度、湿度和电磁兼容性要求，这对于那些在极端条件下运行的系统来说尤为关键。 VITA46标准是现代信息技术领域内一项重要的技术规范，它的实施和遵循对于实现高效、可靠的系统集成和维护具有不可替代的价值。

ANSI/VITA 46.0, VPX Baseline Standard

Page 13

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

VITA for a current list.

VITA 46.0 VPX Base Standard

VITA 46.1 VMEbus Signal Mapping on VPX

VITA 46.3 Serial RapidIO™ on VPX

VITA 46.4 PCI Express on VPX Fabric Connector

VITA 46.7 Ethernet on VPX Fabric Connector

VITA 46.9 XMC/PMC/GbE Signal Mapping to 3U/6U on VPX

VITA 46.10 Rear Transition Module on VPX

VITA 46.11 System Management on VPX

VITA 46.12 Fibre Optic Interface on VPX

VITA 46.20 VPX Switch Slot Definition

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

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

this one.

ANSI/VITA 46.0, VPX Baseline Standard

Page 14

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 should 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.

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

ANSI/VITA 46.0, VPX Baseline Standard

Page 15

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

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.

ANSI/VITA 46.0, VPX Baseline Standard

Page 16

Term

Definition

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 may be used 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

IEEE 1101.2-1992 IEEE Standard for Mechanical Core Specifications for Conduction-Cooled

Eurocards

IEEE 1101.10-2002, IEEE Standard for Additional Mechanical Specifications for

Microcomputers Using the IEEE STD 1101.1-1991 Equipment Practice

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