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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
copyright on this material. By downloading this file the individual agrees not to
charge for or resell the resulting material.
PRICE: Contact JEDEC
Printed in the U.S.A.
All rights reserved
PLEASE!
DON’T VIOLATE
THE
LAW!
This document is copyrighted by JEDEC and may not be
reproduced without permission.
For information, contact:
JEDEC Solid State Technology Association
3103 North 10th Street
Suite 240 South
Arlington, VA 22201-2107
or refer to www.jedec.org under Standards-Documents/Copyright Information.
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
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