User guide

Chapter 3 Hardware
28 Reference Manual Express-IBR
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 PCH through
the COM Express A-B connector. Table 3-4 lists the device names and corresponding reserved addresses on
the SMBus.
GPIO
The Express-IBR 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-IBR 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 tab of the Express-IBR Product page.
For more information about GPIO pin operation, refer to the PCA9535BS GPIO Generator datasheet. See
“References” on page 1 for a hyper link to the datasheet.
Table 3-5 provides the pin signals for the COM Express A-B connector (CN6).
Table 3-4. SMBus Reserved Addresses
Component Address (binary)
SODIMM A 1010,000x
b
(A0h hex)
SODIMM B 1010,010x
b
(A4h hex)
Hardware Temp and Voltage Monitor 1011,100x
b
(2Eh hex)
GPIO Generator 1000,000x
b
(40h hex)
Clock Generator 1101,001x
b
(D2h hex)
Table 3-5. COM Express A-B Connector Signal Descriptions (CN6)
Pin # Row A Pin # Row B
A1 GND B1 GND
A2 GBE0_MDI3- B2 GBE0_ACT# (PU 330E 3.3V)
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. PU 20k in PCH)
A9 GBE0_MDI1- B9 LPC_DRQ1# (Int. PU 20k in PCH)
A10 GBE0_MDI1+ B10 LPC_CLK
A11 GND B11 GND
A12 GBE0_MDI0- B12 PWRBTN# (PU 10k 3.3VStandby)
A13 GBE0_MDI0+ B13 SMB_CK (PU 8.2k 3.3V Standby)
A14 GBE0_CTREF B14 SMB_DAT (PU 8.2k 3.3V Standby)
A15 SUS_S3# B15 SMB_ALERT# (PU 10k 3.3V Standby)
A16 SATA0_TX+ B16 SATA1_TX+
A17 SATA0_TX- B17 SATA1_TX-
A18 SUS_S4# B18 SUS_STAT#
A19 SATA0_RX+ B19 SATA1_RX+