About this book

This book is for the Arm® CoreLink™ DMC-620 Dynamic Memory Controller.

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 experienced hardware engineers who want to integrate the delivered ARM System on Chip (SoC) product in a SoC design.

Using this book

This book is organized into the following chapters:

Chapter 1 Introduction

This chapter describes the DMC-620.

Chapter 2 Functional description

This chapter describes how the DMC-620 operates.

Chapter 3 Programmers model

This chapter describes the programmers model of the DMC-620.

Appendix A Signal descriptions

This appendix describes the DMC-620 signals.

Appendix B Revisions

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


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
Introduces special terminology, denotes cross-references, and citations.
Highlights interface elements, such as menu names. Denotes signal names. Also used for terms in descriptive lists, where appropriate.
Denotes text that you can enter at the keyboard, such as commands, file and program names, and source code.
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.
Encloses replaceable terms for assembler syntax where they appear in code or code fragments. For example:
MRC p15, 0, <Rd>, <CRn>, <CRm>, <Opcode_2>
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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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® APB Protocol Specification (Arm IHI 0024).
  • AMBA® Low Power Interface Specification, Arm® Q-Channel and P-Channel Interfaces (Arm IHI 0068).
  • Principles of Arm® Memory Maps White Paper (Arm DEN 0001).
  • Arm®v8.2 RAS Architecture Extension Specification.

The following confidential books are only available to licensees:

  • Arm® CoreLink™ DMC-620 Dynamic Memory Controller Configuration and Integration Manual (Arm 100569).
  • Arm® CoreLink™ DMC-620 Dynamic Memory Controller Design Manual (Arm 100567).
  • Arm® CoreLink™ CCN-504 Cache Coherent Network Technical Reference Manual (Arm 100017).
  • Arm® AMBA® 5 CHI Architecture Specification (Arm IHI 0050).
Other publications


See the Arm® CoreLink™ DMC-620 Dynamic Memory Controller Release Note for the actual versions of the specifications that Arm used when designing the device.
Non-ConfidentialPDF file icon PDF version100568_0100_00_en
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