SMBUS(4)						   BSD Kernel Interfaces Manual 						  SMBUS(4)

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.

BSD
								  August 10, 1998							       BSD