eMMC接口规范5.01_emmc接口

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JEDEC

STANDARD

Embedded Multi-Media Card

(e•MMC) Electrical Standard (5.01)

JESD84-B50.1

(Minor Revision of JESD84-B50, September 2013)

JULY 2014

JEDEC SOLID STATE TECHNOLOGY ASSOCIATION

NOTICE

JEDEC standards and publications contain material that has been prepared, reviewed, and approved

through the JEDEC Board of Directors level and subsequently reviewed and approved by the JEDEC

legal counsel.

JEDEC standards and publications are designed to serve the public interest through eliminating

misunderstandings between manufacturers and purchasers, facilitating interchangeability and

improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the

proper product for use by those other than JEDEC members, whether the standard is to be used either

domestically or internationally.

JEDEC standards and publications are adopted without regard to whether or not their adoption may

involve patents or articles, materials, or processes. By such action JEDEC does not assume any liability to

any patent owner, nor does it assume any obligation whatever to parties adopting the JEDEC standards or

publications.

The information included in JEDEC standards and publications represents a sound approach to product

specification and application, principally from the solid state device manufacturer viewpoint. Within the

JEDEC organization there are procedures whereby a JEDEC standard or publication may be further

processed and ultimately become an ANSI standard.

No claims to be in conformance with this standard may be made unless all requirements stated in the

standard are met.

Inquiries, comments, and suggestions relative to the content of this JEDEC standard or publication should

be addressed to JEDEC at the address below, or refer to www.jedec.org under Standards and Documents

for alternative contact information.

Published by

©JEDEC Solid State Technology Association 2014

3103 North 10th Street

Suite 240 South

Arlington, VA 22201-2107

This document may be downloaded free of charge; however JEDEC retains the

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PRICE: Contact JEDEC

Printed in the U.S.A.

JEDEC Standard No. 84-B50.1

-i-

EMBEDDED MULTI-MEDIA CARD (e•MMC) ELECTRICAL STANDARD 5.01

Contents

Page

Foreword ................................................................................................................................................................... xix

Introduction .............................................................................................................................................................. xix

1 Scope ............................................................................................................................................................... 1

2 Normative reference ...................................................................................................................................... 1

3 Terms and definitions ................................................................................................................................... 1

4 System Features ............................................................................................................................................. 4

5 e•MMC Device and System .......................................................................................................................... 6

5.1 e•MMC System Overview ............................................................................................................... 6

5.2 Memory Addressing......................................................................................................................... 6

5.3 e•MMC Device Overview ............................................................................................................... 7

5.3.1 Bus Protocol ..................................................................................................................................... 8

5.3.2 Bus Speed Modes ........................................................................................................................... 15

5.3.3 HS200 Bus Speed Mode ................................................................................................................ 15

5.3.4 HS200 System Block Diagram ...................................................................................................... 16

5.3.5 HS200 Adjustable Sampling Host ................................................................................................. 16

5.3.6 HS400 Bus Speed Mode ................................................................................................................ 16

5.3.7 HS400 System Block Diagram ...................................................................................................... 17

6 e•MMC functional description ................................................................................................................... 18

6.1 e•MMC Overview .......................................................................................................................... 18

6.2 Partition Management .................................................................................................................... 19

6.2.1 General ........................................................................................................................................... 19

6.2.2 Command restrictions .................................................................................................................... 22

6.2.3 Extended Partitions Attribute ......................................................................................................... 22

6.2.4 Configure partitions ....................................................................................................................... 23

6.2.5 Access partitions ............................................................................................................................ 26

6.3 Boot operation mode ...................................................................................................................... 26

6.3.1 Device reset to Pre-idle state .......................................................................................................... 26

6.3.2 Boot partition ................................................................................................................................. 28

6.3.3 Boot operation ................................................................................................................................ 29

6.3.4 Alternative boot operation ............................................................................................................. 30

6.3.5 Access to boot partition ................................................................................................................. 33

6.3.6 Boot bus width and data access configuration ............................................................................... 34

6.3.7 Boot Partition Write Protection ..................................................................................................... 34