IS200JPDBG1A自动化模块备件
每个信道上的用户定义信号称为用户信号。附录A修订阅读本附录，了解本规范发布版本之间的技术变更说明。术语表阅读术语表以了解本规范中使用的术语定义。关于本规范的前言ARM IHI 0033B。b版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。ix ID102715非保密惯例本节描述了本规范使用的惯例：•打字•时序图•第x页的信号。bold表示信号名称，并在适当情况下用于描述性列表中的术语。monospace用于汇编程序语法描述、伪代码和源代码示例。也用于主文本中的指令助记符以及对汇编程序语法描述、伪代码和源代码示例中出现的其他项的引用。小资本用于具有特定技术含义的几个术语。时序图时序图约定的关键解释了时序图中使用的组件。变体出现时，有明确的标签。您不能假设图表中没有明确的任何计时信息。阴影总线和信号区域未定义，因此总线或信号可以采用阴影区域表示的任何值。实际液位不重要，不会影响正常操作。时序图约定的关键时序图有时会同时显示高位和低位信号，它们看起来与时序图约定图所示的总线变化相似。如果时序图以这种方式显示单个位信号，则其值不影响所附的描述。时钟高到低瞬态高/低到高总线稳定总线到高阻抗总线变化高阻抗到稳定总线前言关于本规范x版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。ARM IHI 0033B.b非机密ID102715信号信号约定为：信号电平断言信号的电平取决于信号是高电平还是低电平。断言表示：•HIGH（高）表示激活的HIGH信号。•LOW表示激活的LOW信号。小写n在信号名称的开头或结尾表示有效的LOW信号。前缀H表示高级高性能总线（AHB）信号。前缀P表示高级外围总线（APB）信号。数字数字通常用十进制书写。二进制数字前面是0b，十六进制数字前面是0x。这两种字体都是单格字体。附加阅读本节列出了ARM的相关出版物。查看信息中心http://infocenter.arm.com以访问ARM文档。ARM出版物•ARM®AMBA®APB协议规范（ARM IHI 0024）。•ARM®AMBA®AXI和ACE协议规范（ARM IHI 0022）。•多层AHB概述（ARM DVI 0045）。前言反馈ARM IHI 0033B。b版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。xi ID102715非机密反馈ARM欢迎对其文档进行反馈。对此规范的反馈如果您对此规范有任何意见，请发送电子邮件至errata@arm.com给出：•标题，ARM®AMBA®5 AHB协议规范。•编号ARM IHI 0033B。b.•您的评论适用的页码。•对你的评论的简要解释。ARM还欢迎关于添加和改进的一般性建议。前言反馈xii版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。ARM IHI 0033B.b非机密ID102715 ARM IHI 003 3B.b版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。1-13 ID102715非机密第1章简介本章概述了AHB协议。它包含以下部分：•关于第1-14页的协议。•第1-17页AHB修订。•操作见第1-18页。注：出于说明目的，本规范中使用了32位数据总线。允许额外的数据总线宽度，如第6-65页数据总线宽度所示。1简介1.1关于协议1-14版权所有©2001、2006、2010、2015 ARM Limited或其附属公司。保留所有权利。ARM IHI 0033B.b非机密ID102715 1.1关于协议AMBA AHB是一种适用于高性能合成设计的总线接口。它定义了组件之间的接口，如主机、互连和从机。
user defined signals, on each channel, called User signals. Appendix A Revisions Read this appendix for a description of the technical changes between released issues of this specification. Glossary Read the Glossary for definitions of terms used in this specification. Preface About this specification ARM IHI 0033B.b Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. ix ID102715 Non-Confidential Conventions This section describes the conventions that this specification uses: • Typographical • Timing diagrams • Signals on page x. Typographical The typographical conventions are: italic Highlights important notes, introduces special terminology, and denotes internal cross-references and citations. bold Denotes signal names, and is used for terms in descriptive lists, where appropriate. monospace Used for assembler syntax descriptions, pseudocode, and source code examples. Also used in the main text for instruction mnemonics and for references to other items appearing in assembler syntax descriptions, pseudocode, and source code examples. SMALL CAPITALS Used for a few terms that have specific technical meanings. Timing diagrams The Key to timing diagram conventions explains the components used in timing diagrams. Variations, when they occur, have clear labels. You must not assume any timing information that is not explicit in the diagrams. Shaded bus and signal areas are undefined so the bus or signal can assume any value that the shaded area represents. The actual level is unimportant and does not affect normal operation. Key to timing diagram conventions Timing diagrams sometimes show single-bit signals as HIGH and LOW at the same time and they look similar to the bus change that the Key to timing diagram conventions figure shows. If a timing diagram shows a single-bit signal in this way then its value does not affect the accompanying description. Clock HIGH to LOW Transient HIGH/LOW to HIGH Bus stable Bus to high impedance Bus change High impedance to stable bus Preface About this specification x Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. ARM IHI 0033B.b Non-Confidential ID102715 Signals The signal conventions are: Signal level The level of an asserted signal depends on whether the signal is active-HIGH or active-LOW. Asserted means: • HIGH for active-HIGH signals. • LOW for active-LOW signals. Lower-case n At the start or end of a signal name denotes an active-LOW signal. Prefix H Denotes an Advanced High-performance Bus (AHB) signal. Prefix P Denotes an Advanced Peripheral Bus (APB) signals. Numbers Numbers are normally written in decimal. Binary numbers are preceded by 0b, and hexadecimal numbers by 0x. Both are written in a monospace font. Additional reading This section lists relevant publications from ARM. See the Infocenter http://infocenter.arm.com for access to ARM documentation. ARM publications • ARM® AMBA® APB Protocol Specification (ARM IHI 0024). • ARM® AMBA® AXI and ACE Protocol Specification (ARM IHI 0022). • Multi-layer AHB Overview (ARM DVI 0045). Preface Feedback ARM IHI 0033B.b Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. xi ID102715 Non-Confidential Feedback ARM welcomes feedback on its documentation. Feedback on this specification If you have any comments on this specification, send an email to errata@arm.com giving: • The title, ARM® AMBA® 5 AHB Protocol Specification. • The number, ARM IHI 0033B.b. • The page numbers to which your comments apply. • A concise explanation of your comments. ARM also welcomes general suggestions for additions and improvements. Preface Feedback xii Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. ARM IHI 0033B.b Non-Confidential ID102715 ARM IHI 0033B.b Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. 1-13 ID102715 Non-Confidential Chapter 1 Introduction This chapter provides an overview of the AHB protocol. It contains the following sections: • About the protocol on page 1-14. • AHB revisions on page 1-17. • Operation on page 1-18. Note For illustrative purposes, a 32-bit data bus is used in this specification. Additional data bus widths are permitted, as Data bus width on page 6-65 shows. 1 Introduction 1.1 About the protocol 1-14 Copyright © 2001, 2006, 2010, 2015 ARM Limited or its affiliates. All rights reserved. ARM IHI 0033B.b Non-Confidential ID102715 1.1 About the protocol AMBA AHB is a bus interface suitable for high-performance synthesizable designs. It defines the interface between components, such as masters, interconnects, and slaves.
