Information

MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 11-1
Chapter 11
Enhanced Secure Digital Host Controller
11.1 Overview
The enhanced secure digital host controller (eSDHC) provides an interface between the host system and
these types of memory cards:
• Multi Media card (MMC)
MMC is a universal low-cost data storage and communication medium designed to cover a wide
area of applications including mobile video and gaming, which are available from either pre-loaded
MMCs or downloadable from cellular phones, WLAN, or other wireless networks.
• Secure digital (SD) card
The secure digital (SD) card is an evolution of old MMC technology. It is specifically designed to
meet the security, capacity, performance, and environment requirements inherent in the emerging
audio and video consumer electronic devices. The physical form factor, pin assignments, and data
transfer protocol are forward-compatible with the old MMC.
•SDIO
Under the SD protocol, the SD cards can be categorized as a memory card, I/O card, or combo card.
The memory card invokes a copyright protection mechanism that complies with the security of the
SDMI standard. The I/O card provides high-speed data I/O with low power consumption for
mobile electronic devices. The combo card has both memory and I/O functions. To keep
Figure 11-1 simple, the diagram does not show cards with reduced sizes.