1.1.1 Processor - 3 Box Model Flashcards
Characteristics of main memory?
Temporary, volatile, fast access.
Characteristics of secondary memory?
Permanent, non volatile, slow access
What is cache?
Small high speed memory located within the CPU with very fast access.
What does cache store?
Recently or most frequently used instructions.
What is a bus?
Set of wires to connect components.
What are the different types of buses (3)?
Address Bus
Control Bus
Data Bus
What is the address bus?
Unidirectional, one way. Identifies which component you are talking about.
What is the control bus?
Bidirectional bus that carries read and write signals and timing signals.
What is the data bus?
Bidirectional bus that carries data and instructions to and from main memory.
What is a register?
High speed data store in processor.
What is the function of the Arithmetic Logic Unit?
Carries out calculations.
What is an accumulator and what is its function?
Register, stores result from ALU.
What is the program counter and what is its function?
Register, stores address of the next instruction.
What is the memory address register and what is its function?
Stores the address of data to be read from or written to.
What is the memory address register and what is its function?
Stores the address of data to be read from or written to.
