Is the control bus unidirectional or bidirectional?

Question

Please cite reference...
Given when, address bus is unidirectional and data bus is bidirectional.

Answer 1

Control bus is bidirectional as it transfer the control & synchronization signals from control unit to all devices and also do the same from all hardware devices to control unit.

There are two more bus address bus(unidirectional) and data bus(bidirectional)

Answer 2

Control Bus Definition

Answer 3

A control bus by definition is bi-directional. Bi-directionality can be achieved by dedicated command lines from the controller and dedicated status lines from the peripheral or controlled device. It can also be achieved by using a bidirectional data bus in conjunction with the dedicated status and command lines.



The simplest example of a bi-directional control/data bus is a PC parallel port. In addition to the 8 bi-directional data lines there are a number of control and status lines. http://www.beyondlogic.org/spp/parallel.htm describes the operation of the PC parallel port and how to interface with it. A more complex control/data bus is the Bus/Tag channel of an IBM mainframe with 19 control lines. http://www.hydrasystems.com/hydra_systems/pages/404.html

Answer 4

It is bi directional. an adress bus is unidirectional.