Smbus; I2C Bus - ADLINK Technology AMD COM Express Express-VR7 User Manual

Express-VR7 User's Guide
4.3.9

SMBus

Name Pin # Description
SMB_CK B13 System Management Bus bidirectional clock line. Power
sourced through 3.3V standby rail and main power rails.
SMB_DAT# B14 System Management Bus bidirectional data line. Power
sourced through 3.3V standby rail and main power rails.
SMB_ALERT# B15 System Management Bus Alert – active low input can be
used to generate an SMI# (System Management
Interrupt) or to wake the system. Power sourced through
3.3V standby rail and main power rails.
Note: SMBus source from SoC's SMBus is default setting. SMBus source from EC is by build option supported by project basis.

4.3.10 I2C Bus

Name Pin # Description
I2C_CK B33 General purpose I²C port clock output/input
I2C_DAT B34 General purpose I²C port data I/O line
Note: I2C source from EC is default setting. I2C source from SoC's I2C is by build option supported by project basis.
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I/O
I/O OD
3.3VSB
I/O OD
3.3VSB
I 3.3VSB
I/O
I/O OD
3.3VSB
I/O OD
3.3VSB
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PU / PD Comment
PU 2.2K Equivalent resistor is 2.2K
3.3VSB
PU 2.2K Equivalent resistor is 2.2K
3.3VSB
PU 10K
3.3VSB
PU / PD Comment
PU 2.2K
3.3VSB
PU 2.2K
3.3VSB
PICMG COM.0 R3.1