The control bus is part of the system bus of a computer
. The control bus is connected to the processor's control
unit, the memory
and the input/output units and transmits the signalsbidirectionally
that arerequired to control the data transfer
.interrupts, handshaking etc. The control bus has lines to indicate the direction of transfer, whether data is being read or written, and lines to distinguish between the memory and input/output units.