1.1.1 Architecture of the CPU Flashcards

1
Q

Describe what happens in the “fetch” part of the fetch-execute cycle? (3)

A
  1. The address of the instruction to be fetched is placed into the MAR. 2. The instruction is fetched from memory. 3. The instruction is transferred to the MDR.
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2
Q

Describe what happens in the “decode” part of the fetch-execute cycle? (1)

A

The computer decodes the instruction by deciding which instruction should be carried out.

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3
Q

Describe what happens in the “execute” part of the fetch-execute cycle? (1)

A
  1. The decoded instruction is then executed so that the CPU performs continuously
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4
Q

Describe what happens at the end of the fetch execute cycle? (2)

A
  1. The process is repeated 2. The program counter is incremented
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5
Q

What operations does the ALU perform? (1)

A
  1. Arithmetic and logic operations
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6
Q

What does the Control Unit (CU) do? (1)

A

Manages the FDE Cycle

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7
Q

What is a CPU register? (1)

A
  1. The section of high-speed memory within the CPU that stores data to be processed.
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8
Q

State two features of the MAR? (2)

A
  1. It is a register 2. It stores a single address
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9
Q

What is the function of the MAR? (2)

A
  1. Stores the address of the instruction or data that is going to be fetched 2. Holds the address in memory where data is going to be transferred to
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10
Q

What is the function of the MDR? (1)

A
  1. Stores the fetched instruction/ the instruction to be processed
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11
Q

What is the function of the Program Counter? (1)

A
  1. Stores the address of the next (or current) instruction to be run
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12
Q

What is the function of the Accumulator? (1)

A
  1. Stores the result of calculations/processes
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