Nxp Semiconductors UM10237 用户手册

UM10237_2

© NXP B.V. 2008. All rights reserved.

 

The SD/MMC is configured using the following registers:

1. Power: In the PCONP register (

), set bit PC_MCI.

Remark: On reset, the SD/MMC is disabled (PCMCI = 0).

2. Clock: In PCLK_SEL1 select PCLK_MCI (see 

3. Pins: Select SD/MMC pins and their modes in PINSEL0 to PINSEL4 and PINMODE0 

to PINMODE4 (see 

). 

4. Interrupts: Interrupts are enabled in the VIC using the VICIntEnable register 

).

The Secure Digital and Multimedia Card Interface (MCI) is an interface between the 
Advanced Peripheral Bus (APB) system bus and multimedia and/or secure digital memory 
cards. It consists of two parts:

The MCI adapter block provides all functions specific to the Secure Digital/MultiMedia 
memory card, such as the clock generation unit, power management control, 
command and data transfer.

The APB interface accesses the MCI adapter registers, and generates interrupt and 
DMA request signals.

The following features are provided by the MCI:

Conformance to Multimedia Card Specification v2.11.

Conformance to Secure Digital Memory Card Physical Layer Specification, v0.96.

Use as a multimedia card bus or a secure digital memory card bus host. It can be 
connected to several multimedia cards, or a single secure digital memory card.

DMA supported through the General Purpose DMA Controller.

 

MCICLK

Output

Clock output

MCICMD

Input

Command input/output.

MCIDAT[3:0]

Output

Data lines. Only MCIDAT[0] is used for Multimedia cards.

MCIPWR

Output

Power Supply Enable for external SD/MMC power supply.