VITA 46.0-2007：VPX基准标准，恶劣环境应用的高速互连解决方案

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VITA 46.0-2007是美国电气和电子工程师协会（American National Standards Institute, ANSI）与电子工业协会（VMEbus International Trade Association, VITA）联合发布的标准，它定义了VPX（VersaModule Eurocard eXtensions）基线标准，这是一种专为在严苛环境应用中提供高速互连技术而设计的系统架构。VPX是VME总线技术的扩展，旨在支持模块化、高性能和可扩展的系统，尤其适合军事、航空、航天和工业自动化等领域。该标准于2007年10月获得批准，标志着VPX技术的首个正式发布（版本1.0）。随着技术的发展，后续版本也在不断更新和完善。例如，2008年2月的R1.1修正了一些早期文档中的错误，并对附录B中的多个图表进行了修订。4月份的R1.2版本中，针对页面25的建议3-6，将引用的标准从ANSI-VITA40-2004更正为ANSI/VITA40, Status Indicator Standard，反映了标准化进程中的修正和改进。 VPX 46.0标准的核心内容包括但不限于以下几个方面： 1. **体系结构**：它定义了VPX系统的物理尺寸、接口规范、信号标准以及模块间的通信机制，确保组件之间的兼容性和互操作性。 2. **功能组件**：涵盖了电源管理、冷却、信号处理、数据传输等关键组件的规范，以满足不同应用需求。 3. **安全性**：考虑了在高可靠性环境下的安全措施，如故障检测和恢复机制，以及数据传输的加密和认证。 4. **环境适应性**：强调了VPX系统在恶劣环境下的耐用性和抗干扰能力，如高温、湿度、震动等条件下的性能保障。 5. **扩展性**：VPX允许模块化的设计，使得用户可以根据需求灵活地添加或更换组件，提升系统的灵活性和升级潜力。 6. **标准一致性**：作为美国国家标准，VITA 46.0确保了与其他相关标准的协调一致，如VITA 40系列标准，用于状态指示和其他辅助功能。 VITA 46.0-2007不仅是VPX技术的基础，也是工业界和军事领域实现高效、可靠、模块化系统设计的关键参考标准，随着技术的发展，它还将持续演化以适应不断变化的技术需求。

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.

底盘

传导性冷却

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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