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JEDEC SOLID STATE TECHNOLOGY ASSOCIATION

JULY 2007

JEDEC

STANDARD

MultiMediaCard (MMC) Electrical

Standard, High Capacity

(MMCA, 4.2)

JESD84-B42

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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 call (703) 907-7559 or

www.jedec.org

Published by

©JEDEC Solid State Technology Association 2007

2500 Wilson Boulevard

Arlington, VA 22201-3834

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: Please refer to the current

Catalog of JEDEC Engineering Standards and Publications online at

http://www.jedec.org/Catalog/catalog.cfm

Printed in the U.S.A.

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JEDEC Standard No. JESD84-B42

-i-

MultiMediaCard (MMC) Electrical Standard, High Capacity

CONTENTS

Page

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

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

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

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

4 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

5 System features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

6 MultiMediaCard system concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6.1 Higher than a density of 2GB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.2 MMCplus and MMCmobile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.3 Card Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

6.3.1 Form factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.4 Bus concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.4.1 Bus lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.4.2 Bus protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.5 Controller concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.5.1 Application adapter requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.5.2 MultiMediaCard adapter architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7 MultiMediaCard functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

7.2 Card identification mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.2.1 Card reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.2.2 Operating voltage range validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.2.3 Access mode validation (higher than 2GB densities) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.2.4 From busy to ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.2.5 Card identification process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3 Interrupt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.4 Data transfer mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.4.1 Command sets and extended settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.4.2 High speed mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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