MSC Technologies Avnet COM Express CXC-BT, User Manual

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MSC CXC-BT User Manual
29 / 84
Signal Pin
Type Signal
Level Power
Rail Remark /
Tolerance PU/PD/SR Description Source / Target
SMB_CK I/O
OD CMOS 3.3V Sus 3.3V ePU = 2.2
KΩ System Management Bus bidirectional clock line. Power sourced
through 3.3V standby rail. It is not recommended to use this bus for
customer devices.
BT SOC,
Embedded
Controller
SMB_DAT I/O
OD CMOS 3.3V Sus 3.3V ePU = 2.2
KΩ System Management Bus bidirectional data line. Power sourced
through 3.3V standby rail. It is not recommended to use this bus for
customer devices.
BT SOC,
Embedded
Controller
SMB_ALERT# I CMOS 3.3V Sus 3.3V ePU =47
KΩ
System Management Bus Alert
– active low input can be used to
generate SMI# (System Management Interrupt) or to wake the
system. Power sourced through 3.3V standby rail.
BT SOC,
Embedded
Controller
2.10.14
General Purpose I/O
Signal Pin
Type Signal
Level Power
Rail Remark /
Tolerance PU/PD/SR Description Source /
Target
GPI[0:3] I CMOS 3.3V 3.3V General purpose input pins. Pulled high internally on the module.
These signals are multiplexed with SDIO interface. BT SOC,
Embedded
Controller
GPO[0:3] O CMOS 3.3V 3.3V, 50mA iSR = 26
Ω
General purpose output pins. Upon a hardware reset, these outputs
are low. These signals are multiplexed with SDIO interface. BT SOC,
Embedded
Controller
2.10.15
SDIO
Signal Pin
Type Signal
Level Power
Rail Remark /
Tolerance PU/PD/SR Description Source /
Target
SDIO_CD#
( GPO3 ) I CMOS 1.8V/3.3V 1.8V / 3.3V iPU = 20
KΩ
SDIO Card Detect. This signal indicates when a SDIO/MMC card is
present. This pin is mapped to GPO3 and used as an input when
used for SD card support. BT SOC
SDIO_CLK
( GPO0 ) O CMOS 1.8V/3.3V 1.8V / 3.3V iPD = 20
KΩ
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. This pin is mapped to GPO0. BT SOC