Abit KR7A, User Manual

Page: 21 / 104

Installing the Motherboard
User’s Manual
2-11
(6). SMB1 header: System Management Bus (SM-Bus) Connector
This connector is reserved for the system
management bus (SM-Bus). The SM-Bus is a
specific implementation of an I
2
C bus. I
2
C is a
multi-master bus, this means that multiple chips can
be connected to the same bus and each one can act as
a master by initiating a data transfer. If more than one
master simultaneously tries to control the bus, an
arbitration procedure decides which master gets
priority. You can connect the ABIT
™
Postman
®
to
this header, or other devices which utilizes the
SM-Bus.
Note: Watch the pin position and the orientation
(7). TCPU1 & TSYS1: Temperature Thermistor
The TCPU1 is used to detect the CPU temperature.
The TSYS1 is used to detect the system environment
temperature. You can see the readings in the BIOS or
the hardware monitoring screen.
(8). USB2 and USB3 Headers: Additional USB Plugs Header
This header is for connecting the additional USB port
plugs. You can use the special USB port expansion
cable (UB-20). It provides four additional USB plugs.
These USB plugs can be fixed on the back panel.