Table 3-4, Smbus reserved addresses, Table 3-5 – ADLINK Express-CBR User Manual
Page 29: Com express a-b connector signal descriptions
Chapter 3
Hardware
Express-CBR
Reference Manual
25
PCI Express
™
The Express-CBR offers seven (7) x1 PCI Express lanes through the PCH, which can be configured to
support PCI Express edge cards or ExpressCards. One of the seven x1 PCI Express lanes is utilized by the
onboard Ethernet controller therefore only six (6) x1 PCI Express lanes are available on the A-B connector.
The PCI Express interface is based on the PCI Express Specification 1.1.
ExpressCard
™
The Express-CBR supports the implementation of ExpressCards, which require the dedication of one USB
port and one PCI Express lane for each ExpressCard used.
System Management Bus (SMBus)
The I/O Hub (PCH) contains an integrated SMBus controller with both a host and slave SMBus port; but the
host cannot access the slave internally. The slave port allows an external master access to the I/O Hub
through the COM Express A-B connector.
lists the device names and corresponding reserved
addresses on the SMBus.
GPIO
The Express-CBR provides GPIO (General Purpose I/O) pins for custom use through the COM Express A-B
connector. Use the ADLINK Intelligent Device Interface (AIDI) Library to configure the GPIO interface.
AIDI driver information is available on the Express-CBR Product page at:
http://www.adlinktech.com
. An
AIDI demo program and the AIDI User’s Manual describing how to use the GPIO pins also reside in the
Utilities area of the Express-CBR Product page.
For more information about GPIO pin operation, refer to the Intel 5 Series Chipset Datasheet for the PCH
(BD82QM57) controller. Refer to
for a hyper link to the datasheet.
provides the pin signals for the COM Express A-B connector.
Table 3-4. SMBus Reserved Addresses
Component
Address (hex)
SODIMM EPROM
A0h
Clock Generator
D2h
CPU Temperature Sensor
4CH
Table 3-5. COM Express A-B Connector Signal Descriptions
Pin #
Row A
Pin #
Row B
A1
GND
B1
GND
A2
GBE0_MDI_3-
B2
GBE0_ACT#
A3
GBE0_MDI3+
B3
LPC_FRAME#
A4
GBE0_LINK100# (Ethernet Speed LED)
B4
LPC_AD0
A5
GBE0_LINK1000# (Ethernet Speed LED)
B5
LPC_AD1
A6
GBE0_MDI2-
B6
LPC_AD2
A7
GBE0_MDI2+
B7
LPC_AD3
A8
GBE0_LINK#
B8
LPC_DRQ0# (Int. PD 20k in PCH)
A9
GBE0_MDI1-
B9
LPC_DRQ1# (Int. PD 20k in PCH)
A10
GBE0_MDI1+
B10
LPC_CLK
A11
GND
B11
GND
A12
GBE0_MDI0-
B12
PWRBTN# (Int. PU 20k in PCH)
A13
GBE0_MDI0+
B13
SMB_CK (PU 2.2k 3.3V S5 Standby)