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Published SFF-TA-1005 Rev 1.3

Universal Backplane Management (UBM) Page 1

SFF-TA-1005

Specification for

Universal Backplane Management (UBM)

Rev 1.3 January 14, 2020

Secretariat: SFF TA TWG

Abstract: This specification defines the Universal Backplane Management structure.

This specification provides a common reference for systems manufacturers, system

integrators, and suppliers.

This specification is made available for public review, and written comments are

solicited from readers. Comments received by the members will be considered for

inclusion in future revisions of this specification.

The description of a connector in this specification does not assure that the

specific component is actually available from connector suppliers. If such a

connector is supplied it shall comply with this specification to achieve

interoperability between suppliers.

POINTS OF CONTACT:

Josh Sinykin/Jason Stuhlsatz Chairman SFF TA TWG

Broadcom Limited Email: SFF-Chair@snia.org

4385 River Green Parkway

Duluth, GA 30096

Ph: 678-728-1406

Email: josh.sinykin@broadcom.com /jason.stuhlsatz@broadcom.com

Published SFF-TA-1005 Rev 1.3

Universal Backplane Management (UBM) Page 2

Intellectual Property

The user's attention is called to the possibility that implementation of this

specification may require the use of an invention covered by patent rights. By

distribution of this specification, no position is taken with respect to the

validity of a claim or claims or of any patent rights in connection therewith.

This specification is considered SNIA Architecture and is covered by the SNIA IP

Policy and as a result goes through a request for disclosure when it is published.

Additional information can be found at the following locations:

• Results of IP Disclosures: http://www.snia.org/sffdisclosures

• SNIA IP Policy: http://www.snia.org/ippolicy

The SNIA hereby grants permission for individuals to use this document for personal

use only, and for corporations and other business entities to use this document for

internal use only (including internal copying, distribution, and display) provided

that:

Any text, diagram, chart, table or definition reproduced shall be

reproduced in its entirety with no alteration, and,

Any document, printed or electronic, in which material from this document

(or any portion hereof) is reproduced shall acknowledge the SNIA copyright

on that material, and shall credit the SNIA for granting permission for its

reuse.

Other than as explicitly provided above, there may be no commercial use of this

document, or sale of any part, or this entire document, or distribution of this

document to third parties. All rights not explicitly granted are expressly reserved

to SNIA.

Permission to use this document for purposes other than those enumerated

(Exception) above may be requested by e-mailing copyright_request@snia.org. Please

include the identity of the requesting individual and/or company and a brief

description of the purpose, nature, and scope of the requested use. Permission for

the Exception shall not be unreasonably withheld. It can be assumed permission is

granted if the Exception request is not acknowledged within ten (10) business days

of SNIA's receipt. Any denial of permission for the Exception shall include an

explanation of such refusal.

Disclaimer

The information contained in this publication is subject to change without notice.

The SNIA makes no warranty of any kind with regard to this specification,

including, but not limited to, the implied warranties of merchantability and

fitness for a particular purpose. The SNIA shall not be liable for errors contained

herein or for incidental or consequential damages in connection with the

furnishing, performance, or use of this specification.

Suggestions for revisions should be directed to http://www.snia.org/feedback/.

Published SFF-TA-1005 Rev 1.3

Universal Backplane Management (UBM) Page 3

Foreword

The development work on this specification was done by the SNIA SFF TWG, an

industry group. Since its formation as the SFF Committee in August 1990, the

membership has included a mix of companies which are leaders across the industry.

For those who wish to participate in the activities of the SFF TWG, the signup for

membership can be found at http://www.snia.org/sff/join.

Revision History

Rev 1.0 May 4, 2018

- Initial release

Rev 1.1 November 16, 2018

- Update to 2Wire_RESET# signal definition related to 2Wire Mux topology (Table

4-2 and Section 6.2.11)

- Update to PCIe Reset field definition (Section 4.16)

- Update to 2Wire Max Byte Count definition to include 128 and 256 bytes

(Section 5.3.1.2.2)

- Update to Operational State field definition (Section 4.20 and 6.2.1)

- Added Clarifying statements to PMDT Read and Write Transactions (Section

6.2.6.1)

- Added Note to Number of Bytes in a Sector Index (Section 6.2.6.2)

- Updated references to sections (incorrect from previous specification)

Rev 1.2 April 25, 2019

- Update DFC Status and Control to include an individual change count for each

DFC Status and Control Descriptor.

- Fixed error in document. UBM Host uses Read Checksum instead of LCS to check

for valid Read response.

- Fixed error in Change Count Command field description.

Rev 1.3 January 15, 2020

- Updated Section 3 definition of HFC

- Updated Section 4.10 definition of HFC Identity to match Section 3 and

Section 4.12

- Updated Section 4.12 with new Figures and expanded language

- Updated Section 4.16 with DFC PERST# Management Override support and field

usages

- Updated 5.3.1.2.3 – UBM FRU Invalid field description

- Updated Data Byte 4 definition of UBM Port Route Descriptor – clarification

of bit rates for SAS and PCIe and SATA

- Updated 6.2.9 – Backplane Type field description

- Updated 6.2.11 Capabilities Command with DFC PERST# Management Override

- Updated 6.2.12 Features Command with DFC PERST# Management Override

- Updated 6.2.15 – Device Off handling description

- Updates Section B.5 – Backplane Number and Backplane Type field usages

- Added Appendix C

Published  SFF-TA-1005 Rev 1.3 
 
 
Universal Backplane Management (UBM)  Page 5  
Copyright © 2020 SNIA. All rights reserved. 
5.3.2.2.2  Data Byte 1 Definition  39 
5.3.2.2.3  Data Byte 2 Definition  40 
5.3.2.2.4  Data Byte 3 Definition  40 
5.3.2.2.5  Data Byte 4 Definition  41 
5.3.2.2.6  Data Byte 5 Definition  41 
5.3.2.2.7  Data Byte 6 Definition  41 
6  UBM Controller  42 
6.1  2Wire Protocol  42 
6.2  UBM Controller Commands  45 
6.2.1  Operational State Command  45 
6.2.2  Last Command Status Command  46 
6.2.3  Silicon Identity and Version Command  46 
6.2.4  Programmable Update Mode Capabilities Command  47 
6.2.5  Enter Programmable Update Mode Command (Optional)  48 
6.2.6  Programmable Mode Data Transfer Command (Optional)  48 
6.2.6.1  2 Wire Variable Length Transactions  50 
6.2.6.2  Get Non-Volatile Storage Geometry Subcommand  51 
6.2.6.3  Erase Subcommand  52 
6.2.6.4  Erase Status Subcommand  53 
6.2.6.5  Program Subcommand  54 
6.2.6.6  Program Status Subcommand  55 
6.2.6.7  Verify Subcommand  55 
6.2.6.8  Verify Status Subcommand  56 
6.2.6.9  Verify Image Subcommand  57 
6.2.6.10  Verify Image Status Subcommand  57 
6.2.6.11  Set Active Image Subcommand  58 
6.2.6.12  Active Image Status Subcommand  59 
6.2.7  Exit Programmable Update Mode Command (Optional)  59 
6.2.8  Host Facing Connector Info Command  61 
6.2.9  Backplane Info Command  61 
6.2.10  Starting Slot Command  61 
6.2.11  Capabilities Command  62 
6.2.12  Features Command  64 
6.2.13  Change Count Command  65 
6.2.14  DFC Status and Control Descriptor Index Command  66 
6.2.15  DFC Status and Control Descriptor Command  67 
A.  Appendix (Informative):  Host Facing Connector Sideband Signal Assignments  70 
B.  Appendix (Informative):  Backplane Examples  71 
B.1  Backplane Routing  71 
B.2  Adapters cabled to the Backplane  72 
B.3  PCIe Switch on the Backplane  75 
B.4  SAS Expander on the Backplane  77 
B.5  Multiple Backplanes in the Chassis  77 
C.  Appendix (Informative):  Host Considerations  81 
 
 
FIGURES 
Figure 3-1 - UBM Backplane Overview  14 
Figure 3-2 - UBM System Deployment view  15 
Figure 4-1 - 2Wire Device Arrangement with DFC 2Wire behind Mux  19 
Figure 4-2 - 2Wire Device Arrangement with UBM Controllers and DFC 2Wire behind Mux20 
Figure 4-3 – Example of Multiple Backplanes Managed by One Managed Resource  24 
Figure 4-4 - Example of Multiple Backplanes Managed by Two Separate Managed 
Resources  24 
Figure 5-1 - UBM FRU Format  34 

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