About this book

This book describes the functionality of the bridges in the Arm® CoreLink™ XHB-500 product. It also provides the signal descriptions.

Product revision status

The rmpn identifier indicates the revision status of the product described in this book, for example, r1p2, where:

rmIdentifies the major revision of the product, for example, r1.
pnIdentifies the minor revision or modification status of the product, for example, p2.

Intended audience

This book is written for system designers and programmers who are designing or programming a System on Chip (SoC) that uses the XHB-500.

Using this book

This book is organized into the following chapters:

Chapter 1 Introduction

This chapter introduces the XHB-500 bridges.

Chapter 2 Functional Description, AXI5 to AHB5 bridge

This chapter describes the functionality of the AXI5 to AHB5 bridge.

Chapter 3 Functional Description, AHB5 to AXI5 bridge

This chapter describes the functionality of the AHB5 to AXI5 bridge.

Chapter 4 Programmers Model

This chapter describes the programmers model.

Appendix A Signal Descriptions

This appendix describes the interface signals of each XHB-500 bridge.

Appendix B Revisions

This appendix describes the technical changes between released issues of this book.

Glossary

The Arm® Glossary is a list of terms used in Arm documentation, together with definitions for those terms. The Arm Glossary does not contain terms that are industry standard unless the Arm meaning differs from the generally accepted meaning.

See the Arm® Glossary for more information.

Typographic conventions
italic
Introduces special terminology, denotes cross-references, and citations.
bold
Highlights interface elements, such as menu names. Denotes signal names. Also used for terms in descriptive lists, where appropriate.
monospace
Denotes text that you can enter at the keyboard, such as commands, file and program names, and source code.
monospace
Denotes a permitted abbreviation for a command or option. You can enter the underlined text instead of the full command or option name.
monospace italic
Denotes arguments to monospace text where the argument is to be replaced by a specific value.
monospace bold
Denotes language keywords when used outside example code.
<and>
Encloses replaceable terms for assembler syntax where they appear in code or code fragments. For example:
MRC p15, 0, <Rd>, <CRn>, <CRm>, <Opcode_2>
SMALL CAPITALS
Used in body text for a few terms that have specific technical meanings, that are defined in the Arm® Glossary. For example, IMPLEMENTATION DEFINED, IMPLEMENTATION SPECIFIC, UNKNOWN, and UNPREDICTABLE.
Timing diagrams

The following figure 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 within the shaded area at that time. The actual level is unimportant and does not affect normal operation.

Figure 1 Key to timing diagram conventions
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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.

Lowercase n

At the start or end of a signal name denotes an active-LOW signal.

Additional reading

This book contains information that is specific to this product. See the following documents for other relevant information.

Arm publications
  • Arm® AMBA® AXI and ACE Protocol Specification (Arm IHI 0022).
  • Arm® AMBA® 5 AHB Protocol Specification (Arm IHI 0033).
  • AMBA® Low Power Interface Specification, Arm® Q-Channel and P-Channel Interfaces (Arm IHI 0068).
  • Arm® CoreLink™ AXI4 to AHB-Lite XHB-400 Bridge Technical Reference Manual (Arm DDI 0523).

The following confidential books are only available to licensees or require registration with Arm:

  • Arm® CoreLink™ XHB-500 Bridge Configuration and Integration Manual (Arm 101376).
Non-Confidential - BetaPDF file icon PDF version101375_0000_00_en
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