Introduction

1.1About the ARM PrimeCell MultiMedia Card Interface (PL181)

The PrimeCell MultiMedia Card Interface (MMCI) is an Advanced Microcontroller Bus Architecture (AMBA) compliant, System-on-a-Chip (SoC) peripheral that is developed, tested, and licensed by ARM.

See Figure 1-1 for a simplified block diagram of the PrimeCell MMCI.

MMCI
Interrupt and	MMCICLK
DMA requests	MMCICMD
APB	MMCI
APB bus	MMCIDAT
interface	adapter
	Power
	control
PCLK	MCLK

Figure 1-1 PrimeCell MMCI block diagram

The PrimeCell MMCI is an interface between the Advanced Peripheral Bus (APB) system bus and multimedia cards. It consists of two parts:

•The PrimeCell MMCI adapter block provides all functions specific to the multimedia card, such as the clock generation unit, power management control, command and data transfer.

•The APB interface accesses the PrimeCell MMCI adapter registers, and generates interrupt and DMA request signals.

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ARM DDI 0205B

Introduction

1.1.1Features of the PrimeCell MMCI

The following features are provided by the PrimeCell MMCI:

•Conformance to Multimedia Card Specification v2.11.

•Use as a multimedia card bus host. It can be connected to up to 30 cards as a multimedia card bus.

ARM DDI 0205B

Copyright © 2000, 2001 ARM Limited. All rights reserved.

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Introduction

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Copyright © 2000, 2001 ARM Limited. All rights reserved.

ARM DDI 0205B