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AMBA 3 AXI specification
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更新于2023-03-16
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AMBA AXI总线说明书AXI(Advanced eXtensible Interface)是一种总线协议,该协议是ARM公司提出的AMBA(Advanced Microcontroller Bus Architecture)3.0协议中最重要的部分,是一种面向高性能、高带宽、低延迟的片内总线。它的地址/控制和数据相位是分离的,支持不对齐的数据传输,同时在突发传输中,只需要首地址,同时分离的读写数据通道、并支持Outstanding传输访问和乱序访问,并更加容易进行时序收敛。AXI 是AMBA 中一个新的高性能协议。AXI 技术丰富了现有的AMBA 标准内容,满足超高性能和复杂的片上系统(SoC)设计的需求。
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Copyright © 2003, 2004 ARM Limited. All rights reserved.
ARM IHI 0022B
AMBA
®
AXI Protocol
v1.0
Specification
ii Copyright © 2003, 2004 ARM Limited. All rights reserved. ARM IHI 0022B
AMBA AXI Protocol
Specification
Copyright © 2003, 2004 ARM Limited. All rights reserved.
Release Information
Proprietary Notice
Words and logos marked with
®
or
™
are registered trademarks or trademarks of ARM Limited in the EU and
other countries, except as otherwise stated below in this proprietary notice. Other brands and names
mentioned herein may be the trademarks of their respective owners.
Neither the whole nor any part of the information contained in, or the product described in, this document
may be adapted or reproduced in any material form except with the prior written permission of the copyright
holder.
The product described in this document is subject to continuous developments and improvements. All
particulars of the product and its use contained in this document are given by ARM Limited in good faith.
However, all warranties implied or expressed, including but not limited to implied warranties of
merchantability, or fitness for purpose, are excluded.
This document is intended only to assist the reader in the use of the product. ARM Limited shall not be liable
for any loss or damage arising from the use of any information in this document, or any error or omission in
such information, or any incorrect use of the product.
AMBA Specification License
1.Subject to the provisions of Clauses 2 and 3, ARM hereby grants to LICENSEE a perpetual, non-exclusive,
nontransferable, royalty free, worldwide licence to use and copy the AMBA Specification for the purpose of
developing, having developed, manufacturing, having manufactured, offering to sell, selling, supplying or
otherwise distributing products which comply with the AMBA Specification.
2.THE AMBA SPECIFICATION IS PROVIDED “AS IS” WITH NO WARRANTIES EXPRESS, IMPLIED
OR STATUTORY, INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF SATISFACTORY
QUALITY, MERCHANTABILITY, NONINFRINGEMENT OR FITNESS FOR A PARTICULAR
PURPOSE.
3. No licence, express, implied or otherwise, is granted to LICENSEE, under the provisions of Clause 1, to
use the ARM tradename, or AMBA trademark in connection with the AMBA Specification or any products
based thereon. Nothing in Clause 1 shall be construed as authority for LICENSEE to make any
representations on behalf of ARM in respect of the AMBA Specification.
Change history
Date Issue Change
16 June, 2003 A First release
19 March 2004 B Define read and write address channels
ARM IHI 0022B Copyright © 2003, 2004 ARM Limited. All rights reserved. iii
Confidentiality Status
This document is Open Access. This document has no restriction on distribution.
Product Status
The information in this document is Final (information on a developed product).
Web Address
http://www.arm.com
iv Copyright © 2003, 2004 ARM Limited. All rights reserved. ARM IHI 0022B
ARM IHI 0022B Copyright © 2003, 2004 ARM Limited. All rights reserved. v
Contents
AMBA AXI Protocol Specification
Preface
About this document .................................................................................... xiv
Feedback ................................................................................................... xviii
Chapter 1 Introduction
1.1 About the AXI protocol ................................................................................ 1-2
1.2 Architecture ................................................................................................. 1-3
1.3 Basic transactions ....................................................................................... 1-7
1.4 Additional features .................................................................................... 1-11
Chapter 2 Signal Descriptions
2.1 Global signals ............................................................................................. 2-2
2.2 Write address channel signals .................................................................... 2-3
2.3 Write data channel signals .......................................................................... 2-4
2.4 Write response channel signals .................................................................. 2-5
2.5 Read address channel signals .................................................................... 2-6
2.6 Read data channel signals .......................................................................... 2-7
2.7 Low-power interface signals ........................................................................ 2-8
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