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
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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
