Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
1102
41.
High Speed MultiMedia Card Interface (HSMCI)
41.1
Description
The High Speed Multimedia Card Interface (HSMCI) supports the MultiMedia Card (MMC) Specification V4.3, the
SD Memory Card Specification V2.0, the SDIO V2.0 specification and CE-ATA V1.1.
SD Memory Card Specification V2.0, the SDIO V2.0 specification and CE-ATA V1.1.
The HSMCI includes a command register, response registers, data registers, timeout counters and error detection
logic that automatically handle the transmission of commands and, when required, the reception of the associated
responses and data with a limited processor overhead.
logic that automatically handle the transmission of commands and, when required, the reception of the associated
responses and data with a limited processor overhead.
The HSMCI supports stream, block and multi block data read and write, and is compatible with the Peripheral DMA
Controller (PDC) Channels, minimizing processor intervention for large buffer transfers.
Controller (PDC) Channels, minimizing processor intervention for large buffer transfers.
The HSMCI operates at a rate of up to Master Clock divided by 2 and supports the interfacing of 1 slot(s). Each
slot may be used to interface with a High Speed MultiMedia Card bus (up to 30 Cards) or with an SD Memory
Card. Only one slot can be selected at a time (slots are multiplexed). A bit field in the SD Card Register performs
this selection.
slot may be used to interface with a High Speed MultiMedia Card bus (up to 30 Cards) or with an SD Memory
Card. Only one slot can be selected at a time (slots are multiplexed). A bit field in the SD Card Register performs
this selection.
The SD Memory Card communication is based on a 9-pin interface (clock, command, four data and three power
lines) and the High Speed MultiMedia Card on a 7-pin interface (clock, command, one data, three power lines and
one reserved for future use).
lines) and the High Speed MultiMedia Card on a 7-pin interface (clock, command, one data, three power lines and
one reserved for future use).
The SD Memory Card interface also supports High Speed MultiMedia Card operations. The main differences
between SD and High Speed MultiMedia Cards are the initialization process and the bus topology.
between SD and High Speed MultiMedia Cards are the initialization process and the bus topology.
HSMCI fully supports CE-ATA Revision 1.1, built on the MMC System Specification v4.0. The module includes
dedicated hardware to issue the command completion signal and capture the host command completion signal
disable.
dedicated hardware to issue the command completion signal and capture the host command completion signal
disable.
41.2
Embedded Characteristics
Compatible with MultiMedia Card Specification Version 4.3
Compatible with SD Memory Card Specification Version 2.0
Compatible with SDIO Specification Version 2.0
Compatible with CE-ATA Specification 1.1
Cards Clock Rate Up to Master Clock Divided by 2
Boot Operation Mode Support
High Speed Mode Support
Embedded Power Management to Slow Down Clock Rate When Not Used
Supports 1 Multiplexed Slot(s)
̶
Each Slot for either a High Speed MultiMedia Card Bus (Up to 30 Cards) or an SD Memory Card
Support for Stream, Block and Multi-block Data Read and Write
Supports Connection to Peripheral DMA Controller (PDC)
̶
Minimizes Processor Intervention for Large Buffer Transfers
Built in FIFO (from 16 to 256 bytes) with Large Memory Aperture Supporting Incremental Access
Support for CE-ATA Completion Signal Disable Command
Protection Against Unexpected Modification On-the-Fly of the Configuration Registers