NAME¶
smbus
—
System Management Bus
SYNOPSIS¶
device smbus
device iicsmb
device bktr
DESCRIPTION¶
The
smbus system provides a uniform, modular and
architecture-independent system for the implementation of drivers to control
various SMB devices and to utilize different SMB controllers (I2C, PIIX4,
Brooktree848, vm86...).
System Management Bus¶
The
System Management Bus is a two-wire interface
through which simple power-related chips can communicate with rest of the
system. It uses I2C as its backbone (see
iicbus(4)).
A system using SMB passes messages to and from devices instead of tripping
individual control lines.
With the SMBus, a device can provide manufacturer information, tell the system
what its model/part number is, save its state for a suspend event, report
different types of errors, accept control parameters, and return its status.
The SMBus may share the same host device and physical bus as ACCESS bus
components provided that an appropriate electrical bridge is provided between
the internal SMB devices and external ACCESS bus devices.
SEE ALSO¶
bktr(4),
iicbus(4),
iicsmb(4),
smb(4)
The SMBus specification,
http://www.smbus.org/specs/.
HISTORY¶
The
smbus
manual page first appeared in
FreeBSD 3.0.
AUTHORS¶
This manual page was written by
Nicolas
Souchu.