ISO/IEC 14776-253:2023

Information technology - Small Computer System Interface (SCSI) - Part 253: USB attached SCSI - 3 (UAS-3)

Technologies de l'information — Interface de petit système d'ordinateur (SCSI) — Partie 253: SCSI connectée par USB - 3 (UAS-3)

General Information

• Status: Published
• Publication Date: 26-Apr-2023
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1 - Information technology
• Drafting Committee: ISO/IEC JTC 1 - Information technology
• Current Stage: 6060 - International Standard published
• Start Date: 27-Apr-2023
• Due Date: 29-Sep-2025
• Completion Date: 24-Apr-2023

Overview

ISO/IEC 14776-253:2023 - USB attached SCSI - 3 (UAS-3) is the first-edition international standard (published April 2023) that belongs to the ISO/IEC 14776 SCSI family. Prepared via INCITS (as INCITS 572-2021) and adopted by ISO/IEC JTC 1, this part defines how the Small Computer System Interface (SCSI) command set and behaviour are carried over USB using the UAS-3 transport. The document supports consistent implementation, interoperability and conformance for SCSI over USB devices and hosts.

Key topics and technical scope

Based on the published table of contents and editorial structure, the standard addresses technical elements common to UAS protocol specifications, including:

• Normative references, definitions, symbols and abbreviations - foundational terms and referenced documents used throughout the standard.
• Device and descriptor definitions - USB device, configuration and interface descriptors relevant to UAS devices.
• Transport and packet structure - layout and handling of transport packets for carrying SCSI commands and responses over USB.
• SCSI command mapping and processing - how SCSI commands, task management and command-response flows are encapsulated and sequenced.
• Data transfer mechanisms - directions and semantics for DATA IN / DATA OUT operations and bulk/streaming behaviors.
• Error handling and status reporting - reporting of SCSI sense data, transport error conditions and recovery actions.
• Task, reset and power management - task management functions, device resets, power/fault considerations and expected behaviours after events like power loss.
• Conformance and interoperability considerations - testing, transport packet constraints and recommended behaviors to ensure cross-vendor compatibility.

(These topics reflect the document’s content headings and the practical areas the standard governs; detailed protocol fields and numeric parameters are specified in the normative text of the standard itself.)

Applications and users

ISO/IEC 14776-253:2023 is intended for professionals and organizations involved in design, development and procurement of USB‑attached storage:

• Device manufacturers - SSDs, HDD enclosures, USB bridges and embedded storage modules implementing UAS‑3.
• Firmware and driver engineers - host-side drivers and device firmware ensuring correct SCSI-over-USB behaviour.
• System integrators and OEMs - ensuring interoperable storage interfaces across platforms.
• Test labs and conformity assessors - interoperability and compliance testing against the UAS‑3 specification.
• Standards and procurement teams - specifying requirements for USB Attached SCSI compliance in product RFPs and documentation.

Related standards

• ISO/IEC 14776 series (SCSI family)
• Relevant USB specifications and vendor driver/stack guidelines
• INCITS / ANSI contributions referenced in the standard

Keywords: ISO/IEC 14776-253:2023, UAS-3, USB Attached SCSI, SCSI over USB, storage protocol standard, device interoperability, firmware, driver development, conformance.

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 14776-253
First edition
2023-04
Information technology — Small
Computer System Interface (SCSI) —
Part 253:
USB attached SCSI - 3 (UAS-3)
Reference number
© ISO/IEC 2023
© ISO/IEC 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
© ISO/IEC 2023 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed
for the different types of document should be noted (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see https://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by INCITS (as INCITS 572-2021) and drafted in accordance with its editorial
rules. It was assigned to Joint Technical Committee ISO/IEC JTC 1, Information technology, and adopted
under the “fast-track procedure”.
A list of all parts in the ISO/IEC 14776 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2023 – All rights reserved iii

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