JEDEC Standard No. 84-B45
-i-
EMBEDDED MULTI-MEDIA CARD (e•MMC), ELECTRICAL STANDARD (4.5 Device)
Contents
1 Scope ..................................................................................................................................................... 1
2 Normative reference .............................................................................................................................. 1
3 Terms and definitions ........................................................................................................................... 1
4 System Features .................................................................................................................................... 3
5 e•MMC Device and System .................................................................................................................. 5
5.1 e•MMC System Overview ............................................................................................................ 5
5.2 Memory Addressing ...................................................................................................................... 5
5.3 e•MMC Device Overview ............................................................................................................. 5
5.3.1 Bus Protocol .......................................................................................................................... 7
5.4 Bus Speed Modes ........................................................................................................................ 12
5.4.1 HS200 Bus Speed Mode ..................................................................................................... 13
5.4.2 HS200 System Block Diagram ........................................................................................... 13
5.4.3 Adjustable Sampling Host .................................................................................................. 13
6 e•MMC functional description ............................................................................................................ 14
6.1 e•MMC Overview ....................................................................................................................... 14
6.2 Partition Management ................................................................................................................. 15
6.2.1 General ................................................................................................................................ 15
6.2.2 Command restrictions ......................................................................................................... 18
6.2.3 Extended Partitions Attribute .............................................................................................. 18
6.2.4 Configure partitions ............................................................................................................ 18
6.2.5 Access partitions ................................................................................................................. 21
6.3 Boot operation mode ................................................................................................................... 22
6.3.1 Device reset to Pre-idle state ............................................................................................... 22
6.3.2 Boot partition ...................................................................................................................... 23
6.3.3 Boot operation ..................................................................................................................... 24
6.3.4 Alternative boot operation .................................................................................................. 26
6.3.5 Access to boot partition ....................................................................................................... 29
6.3.6 Boot bus width and data access configuration .................................................................... 30
6.3.7 Boot Partition Write Protection ........................................................................................... 30
6.4 Device identification mode ......................................................................................................... 32
6.4.1 Device reset ......................................................................................................................... 32
6.4.2 Access mode validation (higher than 2GB of densities) ..................................................... 33
6.4.3 From busy to ready ............................................................................................................. 33
6.4.4 Device identification process .............................................................................................. 33
6.5 Interrupt mode ............................................................................................................................. 34
6.6 Data transfer mode ...................................................................................................................... 36
6.6.1 Command sets and extended settings .................................................................................. 38
6.6.2 High-speed modes selection ................................................................................................ 38
6.6.3 “High-speed” mode selection .............................................................................................. 39
6.6.4 “HS200” timing mode selection.......................................................................................... 39
6.6.5 Power class selection .......................................................................................................... 40
6.6.6 Bus testing procedure .......................................................................................................... 40
6.6.7 Bus Sampling Tuning Concept ........................................................................................... 42