Structure and Function of the Processor Flashcards
What does the Arithmetic Logic unit do
The ALU completes all the arithmetical and logical operations
What is the Control Unit
A part of the processor which directs operations inside the CPU
What are registers
Small memory cells that operate at high speeds
What does the Program Counter (PC) do
Holds the address of the next instruction
In which part of the CPU do all calculations take place
The Arithmetic and Logic Unit (ALU)
Where are intermediate arithmetic and logic results stored
In the accumulator (ACC)
What does the Memory Address Register do
Holds the address of a location that is to be read from or written to
What does the Memory Data Register do
Temporarily stores the data that has just been read from or the data needs to be written
What does the Current Instruction Register do
Holds the current instruction divided up into opcode and operand
What is a Bus
A set of parallel wires connecting two or more components together
What is the system bus
The collection of the data bus, address bus, and control bus
What is the width of a bus
The number of parallel wires it has
What is the data bus
A bidirectional bus used to transport data and instructions between components
What is the control bus
The bi-directional bus used to transmit control signals between internal and external components
What is the address bus used for
Used to transmit the memory address specifying where data is to be sent from or retrieved from
What does adding a wire to the address bus do to the number of addressable locations
It doubles the number of addressable locations
What does the Bus Request indicate
Indicates a device is requesting access to the data bus
What does Bus Grant indicate
Indicates the CPU has granted access to the data bus
What does memory write do
Causes the data on the data bus to be
written into the addressed location
What does memory read do
Causes the data from the addressed location to be placed onto the data bus
What does the interrupt request control signal indicate
Indicates that a device is requesting access to the CPU
What is the clock control signal used for
It is used to synchronise instructions
What is Assembly Language
Assembly Language is a programming language where mnemonics are used to represent instructions
What is opcode
Opcode is used to determine the type of instruction and what hardware to use to execute it
