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Table 44 : Signal Definition SDIO
Signal
SDIO_CD#
/ GPO3
SDIO_CLK
/ GPO0
SDIO_CMD
/ GPO1
SDIO_WP
/ GPO2
SDIO_DAT0
/ GPI0
SDIO_DAT1
/ GPI1
SDIO_DAT1
/ GPI2
SDIO_DAT1
/ GPI3
Note:
1. SOM-5992 doesn't support SDIO.
Pin#
Description
B63
SDIO Card Detect. This signal indicates when a
SDIO/MMC card is present.
Carrier Board:
Connect to CD# of SDIO/MMC device or card
N/C if not used
A93
SDIO Clock. With each cycle of this signal a one-bit
transfer on the command and each data line occurs.
This signal has maximum frequency of 48 MHz
Carrier Board:
Connect to CLK of SDIO/MMC device or card
N/C if not used
B54
SDIO Command/Response. This signal is used for
card initialization and for command transfers. During
initialization mode this signal is open drain. During
command transfer this signal is in push-pull mode.
Carrier Board:
Connect to CMD of SDIO/MMC device or card
N/C if not used
B57
SDIO Write Protect. This signal denotes the state of
the write-protect tab on SD cards.
Carrier Board:
Connect to WP of SDIO/MMC device or card
N/C if not used
SDIO Data lines. These signals operate in push-pull
A54
mode.
A63
Carrier Board:
A67
Connect to DATA0-3 of SDIO/MMC device or card
A85
N/C if not used
１１３
I/O
Notes
I 3.3V
1
CMOS
O 3.3V
1
CMOS
O 3.3V
1
CMOS
I 3.3V
1
CMOS
I/O 3.3V
1
CMOS
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