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ANSI/VITA 42.0-2008 (R2014) VITA

info@vita.com

Approved ANSI Standard

ANSI/VITA 42.0-2008 (R2014)

XMC

Abstract

This document defines an open standard for supporting high-speed, switched

interconnect protocols on an existing, widely deployed mezzanine card form factor.

Approved: December 2008

Reaffirmed: August 2014

American National Standards Institute, Inc.

Secretariat: VITA

ANSI/VITA 42.0-2008 (R2014)

Notices

American National Standard

Approval of an American National Standard requires verification by ANSI that the requirements

for due process, consensus, and other criteria for approval have been met by the standards

developer.

Consensus is established when, in the judgment of the ANSI Board of Standards Review,

substantial agreement has been reached by directly and materially affected interests.

Substantial agreement means much more than a simple majority, but not necessarily unanimity.

Consensus requires that all views and objections be considered, and that a concerted effort be

made toward their resolution.

The use of American National Standards is completely voluntary; their existence does not in

any respect preclude anyone, whether he has approved the standards or not, from

manufacturing, marketing, purchasing, or using products, processes, or procedures not

conforming to the standards.

The American National Standards Institute does not develop standards and will in no

circumstances give an interpretation of any American National Standard. Moreover, no person

shall have the right or authority to issue an interpretation of an American National Standard in

the name of the American National Standard Institute. Requests for interpretations should be

addressed to the secretariat or sponsor whose name appears on the title page of this standard.

CAUTION NOTICE: This American National Standard may be revised or withdrawn at any

time. The procedures of the American National Standards Institute require that action be taken

periodically to reaffirm, revise, or withdraw this standard. Purchases of American National

Standards may receive current information on all standard by calling or writing the American

National Standards Institute.

NOTE: The user’s attention is called to the possibility that compliance with this standard may

require use of an invention covered by patent rights.

By publication of this standard, no position is taken with respect to the validity of this claim or of

any patent rights in connection therewith. The patent holder has, however, filed a statement of

willingness to grant a license under these rights on reasonable and nondiscriminatory terms and

conditions to applicants desiring to obtain such a license. Details may be obtained from the

standards developer.

Published by:

VITA

Except for employees of VITA member companies, no part of this publication may be

reproduced in any form, in an electronic retrieval system or otherwise, without prior written

permission of the publisher.

Printed in the United States of America - R1.2, ISBN 1-885731-80-9.

ANSI/VITA 42.0-2008 (R2014)

Table of Contents

1 Introduction ........................................................................................................................................... 1

1.1 Objectives ..................................................................................................................................... 1

1.2 Overview ....................................................................................................................................... 1

1.3 Terminology .................................................................................................................................. 1

1.3.1 Specification Key Words ......................................................................................................... 1

1.3.2 Definitions ................................................................................................................................ 2

1.4 Normative References .................................................................................................................. 3

1.5 Dimensions ................................................................................................................................... 4

2 Compliance ........................................................................................................................................... 5

3 Mezzanine Cards .................................................................................................................................. 6

3.1 Overview ....................................................................................................................................... 6

3.2 Single-Width Mezzanine Cards .................................................................................................... 7

3.3 Double-Width Mezzanine Cards ................................................................................................... 9

3.4 Populating Optional PMC Connector Areas ............................................................................... 11

3.5 Populating Optional XMC Connector Areas ............................................................................... 11

3.6 Conduction Cooling..................................................................................................................... 11

4 Carrier Board ...................................................................................................................................... 12

4.1 Overview ..................................................................................................................................... 12

4.2 Connector Configurations ........................................................................................................... 14

4.3 Populating Optional PMC Connector Areas ............................................................................... 14

4.4 Populating Optional XMC Connector Areas ............................................................................... 14

5 XMC Connector .................................................................................................................................. 17

5.1 Pin Definitions for Primary XMC Connectors .............................................................................. 17

5.2 Pin Definitions for Secondary XMC Connectors ......................................................................... 20

5.2.1 Fabric Mode Pin Usage for XMC Secondary Connectors ..................................................... 20

5.2.2 User I/O Mode Pin Usage for XMC Secondary Connectors ................................................. 20

5.3 JTAG Signals .............................................................................................................................. 21

5.4 IPMI Support ............................................................................................................................... 21

5.5 Connector Pads and Labeling .................................................................................................... 22

5.6 Connector Assembly ................................................................................................................... 22

5.7 Signal Routing and Electrical ...................................................................................................... 23

5.8 Power Consumption and Heat Dissipation ................................................................................. 24

5.8.1 Carrier Voltage ...................................................................................................................... 24

5.8.2 Power Sequencing ................................................................................................................ 24

6 Identification ....................................................................................................................................... 25

6.1 Labels ......................................................................................................................................... 25

6.2 Label Locations ........................................................................................................................... 25

6.3 Identification Block ...................................................................................................................... 25

7 Compatibility Issues............................................................................................................................ 27

7.1 Mechanical Interoperability ......................................................................................................... 27

7.2 Electrical Interoperability ............................................................................................................. 27

7.3 System Interoperability ............................................................................................................... 27

ANSI/VITA 42.0-2008 (R2014)

8 Appendix A: Recommendations for Protocol Layer Standards .......................................................... 28

9 Appendix B: Identification Block Identifiers and Parameters for PMC Connectors ............................ 29

10 Appendix C: Connector Pin Usage on P25 for Double-Width Cards ................................................. 30

11 Appendix D: IPMI Serial EEPROM FRU Information ......................................................................... 31

11.1 Addressing .................................................................................................................................. 31

11.2 Devices ....................................................................................................................................... 31

11.3 FRU Data .................................................................................................................................... 31

12 Appendix A: Acknowledgements ........................................................................................................ 33

12.1 Working Group Members ............................................................................................................ 33

12.2 ANSI Ballot Group....................................................................................................................... 34

12.3 Comments, Corrections, or Additions ......................................................................................... 35

List of Tables

Table 1-1: Definitions .................................................................................................................................... 2

Table 5-1: Primary XMC Connector Pin Definition...................................................................................... 17

Table 5-2: I2C Address Decoding ............................................................................................................... 18

Table 5-3: Signal Summary......................................................................................................................... 19

Table 5-4: Secondary XMC Connector Pin Definition ................................................................................. 20

Table 5-5: PCIe to VITA Connector Comparison ........................................................................................ 23

Table 5-6: Voltage Level Tolerances .......................................................................................................... 24

Table 5-7: Voltage Level Tolerances for VPWR ......................................................................................... 24

Table 6-1: Identification Block – General Format ....................................................................................... 26

Table 9-1: Sample Compatibility Identification Block .................................................................................. 29

Table 11-1: Subtype 0: base definition (fixed length, mandatory) .............................................................. 31

Table 11-2: Subtype 1: I2C device definition (variable length, optional) .................................................... 32

Table 12-1: Working Group Members ......................................................................................................... 33

Table 12-2: ANSI Ballot Group ................................................................................................................... 34

List of Figures

Figure 3-1: Typical XMC Single-Width Mezzanine Card without PMC Connectors ..................................... 6

Figure 3-2: Typical XMC Double-Width Mezzanine Card without PMC Connectors .................................... 7

Figure 3-3: Single-Width Mezzanine Card Mechanical Layout with Optional PMC Connectors (Conduction

Cooled Holes Not Shown) ............................................................................................................................. 8

Figure 3-4: Optional Single-Width Mezzanine Card Mechanical Layout with Shortened Depth .................. 8

Figure 3-5: XMC Connector Placement Details on Single-Width Mezzanine Card ...................................... 9

Figure 3-6: Double-Width Mezzanine Card Connector Mechanical Layout with Optional PMC Connectors

(Conduction Cooled Holes Not Shown) ...................................................................................................... 10

Figure 3-7: Optional Double-Width Mezzanine Card Connector Mechanical Layout with Shortened Depth

.................................................................................................................................................................... 11

Figure 4-1: Typical 6U Carrier Card Supporting a Single XMC .................................................................. 13