About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
58
Memory cards
The ConnectCore for i.MX51 module provides up to four MMC/SD/SDIO interfaces.
n MultiMediaCard (MMC)
This is a universal low-cost data storage and communication media that is designed to cover a
wide area of applications including mobile video and gaming, WLAN or other wireless networks.
Old MMC cards are based on 7-pin serial bus with a single data pin, while the newer high-speed
MMC communication is based on an advanced 11-pin serial bus designed to operate at lower
voltage.
n Secure Digital (SD) card
This is an evolution of earlier MMC technology. It is specifically designed to meet the security,
capacity, performance, and environment requirements inherent in newly emerging audio and
video consumer electronic devices. The physical form factor, pin assignment and data transfer
protocol are forward compatible with MMC, with some additions. Under the SD protocol, an SD
card can be categorized as memory card, I/O card, or combo card (having both memory and I/O
functions).
The main features of the Memory Card interfaces are the following:
n Designed to work with MMC, MMC plus, MMC RS, SD memory, miniSD memory, SDIO, and SD
Combo. Compatible with the following specifications:
l MMC System Specification Version 4.2
l SD Host Controller Standard Specification Version 2.0
l SD Memory Card Specification Version 2.0: supports High-Capacity SD Memory Cards
l SDIO Card Specification Version 2.0
n Supports 1, 4, or 8 bit MMC modes and 1bit or 4 bit SD and SDIO modes
l Card bus clock frequency up to 52 MHz
l Up to 416 Mb/s of data transfer for MMC cards in 8-bit mode
l Up to 200 Mb/s of data transfer for SD/SDIO cards in 4-bit mode
l Allows cards to interrupt the host in 1-bit and 4-bit SDIO modes, also supports interrupt
period
The following table shows the memory card signals available on the module connectors:
Signal Memory Card 1 Memory Card 2 Memory Card 3 Memory Card 4
Card Detect (CD #) √ √
CLK √ √ √ √
CMD √ √ √
LCTL √
WP# √ √
DATA3 - DATA0 √ √ √ √
DATA7 - DATA4 √ √ √
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