Micro-Sd Card Interface - LG KF305 Service Manual

3. TECHNICAL BRIEF

3.11 Micro-SD Card Interface

MC_D2
MC_D3
MC_CMD
R325
MC_DET
AD6900 provides an interface for Multi-Media Cards (MMC), Secure Digital Memory Cards (SD Card),
and Secure Digital Input/Output Cards (SDIO). All of these cards use similar interface protocols. The
main difference between MMC and SD support is the initialization sequence. The main difference
between SD card and SDIO support is the use of interrupt and read wait signals for SDIO.
Features of the MMC/SD interface (MMCI) include:
Support for a single MMC, SD Memory or SDIO card
Support for 1-bit and 4-bit SD modes (SPI mode is not supported)
A six-pin external interface with clock, command, and up to 4 data lines
Card detection using one of the data pins
Card interface clock generation from SYSCLK
SDIO interrupt and read wait features
The following table lists the six pins in the MMCI
The MMCI consists of an MMC/SD controller along with a peripheral bus interface.
The controller handles the multi-media and secure digital card functions. This includes clock
generation, power management, command transfer, and data transfer. The bus interface contains 32-
bit memory mapped registers, converts 16-bit PBUS accesses to 32-bit register accesses,
LGE Internal Use Only
2V93_VEXT 2V93_VEXT
R319 R323
100K 100K
1
2
3
4
9
0
10
R328
C329
1M
2.2u
Figure 3-11. Micro-SD Interface
- 42 -
2V93_VEXT
R320
(SCHB1A0202)
J301
100K 100K
8
DAT2 DAT1
7
DAT3 DAT0
6
CMD VSS
5
VDD CLK
11
GND1 GND3
12
GND2 GND4
Copyright © 2009 LG Electronics. Inc. All right reserved.
R321
MC_D1
MC_D0
MC_CLK
Only for training and service purposes