Manual

KTD-S0051-D Page 27 Secure Digital and Multimedia Card
KTAM3874/pITX User's Guide
12 Secure Digital and Multimedia Card
The SD/MMC interface can be divided into two parts: one microSD
TM
card socket and one onboard e.MMC
device. The microSD
TM
card controller supports the SD specification revision 2.0 (implies the SDSC and SDHC
families) and the MMC specification revision 4.3. The data bus width accounts four bits, the transfer rate
can be up to 48 MHz. The second part includes a 4 GByte E
mbedded Flash Drive (EFD) with an industry
standard e.MMC interface (8 bit data width). Following the controller assignment:
microSD x MMC/SD/SDIO 1
e.MMC Flash x MMC/SD/SDIO 2
12.1 Connector
The microSD
TM
card socket is named J1400 (8 pins).
Header Pin Signal Description Type
1 DATA2 Data bit 2 IO-33
2 CD / DATA3 Card detect / Data bit 3 IO-33
3 CMD Command line IO-33
4
VCC3
1)
Power +3.3V PWR
5 CLK Clock O-33
6 GND Ground PWR
7 DATA0 Data bit 0 IO-33
1
8 DATA1 Data bit 1 IO-33
Note: 1) To protect the external power lines of peripheral devices make sure that
- the wires have the right diameter to withstand the maximum available current.
- to enclosure of the peripheral device fulfills the fire-protecting conditions of IEC/EN 60950.