Buses Flashcards
Learn the busses and their purposes
What is a bus?
A bus is a set of parallel wires connecting two or more components of a computer.
What are the 3 busses?
Address bus, Data bus, Control bus
What is the role of the address bus?
When CPU wishes to access a particular main memory location, it sends this address to the memory through the address bus.
What are all the three buses known as collectively ?
The three buses are collectively known as the system bus.
What is the role of the data bus?
The role of the data bus is to return the data back to the CPU after it has been collected.
What is the purpose of the control bus?
The purpose of the control bus is to transmit command, timing and specific status information between system components.
Give examples of three commands the control bus can carry out.
Memory Write: causes data on the data bus to be written into the addressed location
Clock: used to synchronise operations
Reset: Initialises all Components
How does the width of the data bus affect performance?
The wider the data bus the more information that can be transferred therefore the faster the transfer will be done.
What does the width of the address bus determine?
The width of the address bus determines the maximum possible memory capacity of the system.
