Advantech ROM-DB7502 User Manual page 39

2.4.2.9 SD Card Socket (SD1)
The ROM-DB7502 Evaluation Board features 4-bit SDIO interfaces.
Pin Pin Name
1 SDIO_DATA3_X
2 SDIO_CMD_X
3 GND
4 +V3_SDIO
5 SDIO_CK_X
6 GND
7 SDIO_DATA0_X
8 SDIO_DATA1_X
9 SDIO_DATA2_X
CD SDIO_CD#
WP SDIO_WP
COM GND
H1 GND
H2 GND
H3 GND
H4 GND
DESCRIPTION
SDIO Data.These signals operate in push-
pull mode
SDIO Command/Response. This signal is
used for card initialization and for com-
mand transfers. During initialization mode
this signal is open drain. During command
transfer this signal is in push-pull mode
GND
Power
SDIO Clock. With each cycle of this signal
a one-bit transfer on the command and
each data line occurs
GND
SDIO Data.These signals operate in push-
pull mode
SDIO Data .These signals operate in push-
pull mode
SDIO Data .These signals operate in push-
pull mode
SDIO Card Detect. This signal indicates
when a SDIO card is present
SDIO Write Protect. This signal denotes
the state of the write-protect tab on SD
cards.
GND
GND
GND
GND
GND
31 ROM-DB7502 User Manual