SAM3A4C Atmel Corporation, SAM3A4C Datasheet - Page 919

• Manufacturer Part Number: SAM3A4C
• Manufacturer: Atmel Corporation

37. High Speed MultiMedia Card Interface (HSMCI)
37.1
37.2
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Description
Embedded Characteristics
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.
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.
The HSMCI supports stream, block and multi block data read and write, and is compatible with
the DMA Controller (DMAC), 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
2 slot(s). Each slot may be used to interface with a High Speed MultiMediaCard bus (up to 30
Cards) or with an SD Memory Card. Only one slot can be selected at a time (slots are multi-
plexed). 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, com-
mand, 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.
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.
• 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 2 Multiplexed Slot(s)
• Support for Stream, Block and Multi-block Data Read and Write
• Supports Connection to DMA Controller (DMAC)
• Built in FIFO (from 16 to 256 bytes) with Large Memory Aperture Supporting Incremental
• Support for CE-ATA Completion Signal Disable Command
Access
– Each Slot for either a High Speed MultiMediaCard Bus (Up to 30 Cards) or an SD
– Minimizes Processor Intervention for Large Buffer Transfers
Memory Card
SAM3X/A
SAM3X/A
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