STW4810 datasheet(43/72 Pages) STMICROELECTRONICS

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STw4810

4 Functional description

Rev3

43/72

4.5

SD/MMC/SDIO module

This block provides the power supply (1.8 V, 2.85 V or 3 V) and signal shifting functions

required to connect any of the following peripherals to the multimedia processor:

–SD card

–

MMC cards, low and 52 MHz high speed

–

SDIO cards (except SDIO card version 1.0 / Vsupply range: [3.1; 3.6] V

Cards detection is automatically done by the multimedia processor system. Following a card

detection, the multimedia processor starts the SD/MMC application by writing in the SD MMC

control register (

Table 17) to start LDO VMMC and then starts the protocol initialization.

The module includes:

–

1.8 V, 2.85 V or 3 V voltage regulators (150 mA)

–

Five bidirectional level shifter channels compatible with 1.8 V, 2.85 V or 3 V

–

Two unidirectional lines for clock: multimedia processor to card and feedback clock to

multimedia processor for synchronization.

–

Four control signals for channel direction

Figure 13. SD MMC block diagram

SD/ MMC/SDIO INTERFACE

1.8V,2.85V,3V

VBAT_VMMC

VMMC

DRIVER

Level

Shifter

LATCHCLK

CLKOUT

DATAOUT0

MCCLK

MCFBCLK

MCCMDDIR

MCDATA0DIR

MCDATA31DIR

MCCMD

MCDATA[3:1]

MCDATA0

SD, MMC

SDIO OR

CARDS

CMDOUT

5 * RB

DATAOUT[3:1]

Vsdc2

EMIF

MCDATA2DIR

3 * RA

150mA

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