EP550 Datasheet, PDF (2/3 Pages) Actel Corporation – EP550 SDIO/SD Memory/MMC Host Controller

Eureka Technology
EP550 SD/SDIO/MMC
Host Controller
Description
The EP550 is a host controller for SD memory, SDIO, SD combo and MMC inter-
face. The core connects the host CPU of the system to the SD card socket. Exter-
nal SD cards can be accessed by the host CPU through the EP550 controller IP
core.
SD memory and SDIO are low cost, high speed interfaces designed for removable
mass storage and IO devices. It is a very flexible architecture supporting variable
clock rate and 1 to 4-bit SD data width. Data rate up to 25Mbyte/sec (200Mbs)
can be realized with SD interface. The MMC standard allows up to 8-bit of paral-
lel data to be transferred with data rate of 50Mbyte/sec. Features such as plug and
play, auto-detection, error correction, write protection are standard with SD card
interface and supported by the EP550.
The EP550 SD card host controller core is designed according to the SD Associa-
tion’s latest SD host controller specification (version 2.0). The core presents itself
as a standard register set to the OS and application software. To access the SD
card, the host CPU simply issue read/write access to the control registers in the
core. The controllers core handles all the SD card protocol automatically includ-
ing data shifting, timing and CRC generation. The core has an optional DMA con-
troller so that data can be automatically transferred between the system and the
SD card without CPU intervention. Because it supports the standard SD register
set, the EP550 is automatically recognized by any operating systems that supports
the SD bus. No driver development is needed. In applications where there is no
operating system of the OS does not have built-in SD support, Eureka provides
free source code to help user develop the bus driver.
There are several options for user hardware interface to the controller core. The
controller supports generic user interface optimized for on-chip logic interface as
well as embedded CPU interface such as AMBA AHB and APB bus, Wishbone,
SH4, PCI and generic address/data interface.
With the EP550, SD card interface can be realized with very little development
cost and effort. Designer can add SD memory and SDIO interface to the system by
simply adding the EP550 module without impacting the rest of the system archi-
tecture.
Free Source Code
The EP550 implements the standard SD host controller register set which supports
any standard operating systems that supports SD bus. For applications where the
user need to develop its own SD driver software, Eureka provides free source
code for driver development.
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