Signal Description
2.6
Secure Digital I/O (SDIO)/MultiMedia Card
(MMC) Signals
Power
Well
Signal Name
Type
Description
SDIO Controller 0/1/2 Data: These signals operate in
push-pull mode. The SD card includes internal pull-up
resistors for all data lines. By default, after power-up,
only SDn_DATA0 is used for data transfer. Wider data
bus widths can be configured for data transfer.
SD0_DATA[3:0]
SD1_DATA[3:0]
SD2_DATA[7:0]
I/O
CMOS3.3
Core
NOTE: Port 0 and 1 are 4 bits wide while ports 2 is 8 bits
wide.
SDIO Controller 0/1/2 Command: This signal is used
for card initialization and transfer of commands. It has
two operating modes: open-drain for initialization mode,
and push-pull for fast command transfer.
SD0_CMD
SD1_CMD
SD2_CMD
I/O
CMOS3.3
Core
Core
SDIO Controller 0/1/2 Clock: With each cycle of this
signal a one-bit transfer on the command and each data
line occurs.
SD0_CLK
SD1_CLK
SD2_CLK
O
This signal is generated by the Intel® SCH at a
maximum frequency of:
CMOS3.3
24 MHz for SD and SDIO.
48 MHz for MMC.
SD0_WP
SD1_WP
SD2_WP
I
SDIO Controller 0/1/2 Write Protect: These signals
denote the state of the write-protect tab on SD cards.
Core
Core
Core
Core
CMOS3.3
SD0_CD#
SD1_CD#
SD2_CD#
I
SDIO Controller 0/1/2 Card Detect: These signals
indicates when a card is present in an external slot.
CMOS3.3
SD0_LED
SD1_LED
SD2_LED
SDIO Controller 0/1/2 LED: These signals can be
used to drive an external LED and indicate when
transfers are occurring on the bus.
O
CMOS3.3
SD0_PWR#
SD1_PWR#
SD2_PWR#
SDIO/MMC Power Enable: These pins can be used to
enable the power being supplied to an SDIO/MMC
device.
I/O
CMOS3.3
Datasheet
37
INTEL [ INTEL ]
