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KTD-S0002-I Page 25 Secure Digital I/O and Multimedia Card

pITX-SP User's Guide

12 Secure Digital I/O and Multimedia Card

The SDIO/MMC interface comes with two controllers: one microSD card socket (only memory cards avail-

able) and one pin strip for using a standard SDIO connector (9 pins), miniSD Card connector (11 pins) or a

second microSD Card connector (8 pins). Both controllers supports SDIO revision 1.1 and MMC revision 4.0.

Exception: SD memory cards with a capacity greater than 2 GB can be used (feature from SDHC revision

2.0). The data bus width accounts one or four bits, the SDIO transfer rate can be up to 24 MHz and MMC rate

up to 48 MHz.

The signal line /CD (C

ard Detect, active low) of connector J3201 must be connected. The signal line /WP

rite Protect, active low) is optional (default: write enabled). A BIOS Setup setting allows write protection

of the microSD card socket (J3200).

Both controllers have some restrictions: they doesn't support zero block size transfers and the multiple

transfer mode (DMA and PIO mode).

12.1 microSD Card Connector

The microSD card socket is named J3200 (8 pins).

Header Pin Signal Name Function

1 DAT2 Data bit 2

2 CD / DAT3 Card detect / Data bit 3

3 CMD Command line

VCC

Power +3.3V

5 CLK Clock

6 GND Ground

7 DAT0 Data bit 0

8 DAT1 Data bit 1

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