JEDEC Standard No. 84-B51A
-i-
EMBEDDED MULTI-MEDIA CARD (e•MMC) 5.1A DEVICE
Contents
Page
Foreword.................................................................................................................................................................. xviii
Introduction ............................................................................................................................................................. xviii
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 ........................................................................................................................ 21
6.2.3 Extended Partitions Attribute ............................................................................................................ 21
6.2.4 Configure partitions ........................................................................................................................... 22
6.2.5 Access partitions................................................................................................................................ 25
6.3 Boot operation mode ..................................................................................................................................... 25
6.3.1 Device reset to Pre-idle state ............................................................................................................. 25
6.3.2 Boot partition ..................................................................................................................................... 27
6.3.3 Boot operation ................................................................................................................................... 28
6.3.4 Alternative boot operation ................................................................................................................. 29
6.3.5 Access to boot partition ..................................................................................................................... 33
6.3.6 Boot bus width and data access configuration ................................................................................... 33
6.3.7 Boot Partition Write Protection ......................................................................................................... 34
6.4 Device identification mode ........................................................................................................................... 36
6.4.1 Device reset ....................................................................................................................................... 36
6.4.2 Access mode validation (higher than 2GB of densities) .................................................................... 37
6.4.3 From busy to ready ............................................................................................................................ 37
6.4.4 Device identification process ............................................................................................................ 38
6.5 Interrupt mode ............................................................................................................................................... 38
6.6 Data transfer mode ........................................................................................................................................ 40
6.6.1 Command sets and extended settings ................................................................................................ 42
6.6.2 High-speed modes selection .............................................................................................................. 43
评论1