Computer science topic 7 Machine instruction cycle

Address Bus

An element in a computer CPU that transmits the location of stored information. It allows the CPU to send the address to RAM, and the data bus allows the actual data transfer to the CPU.

Outline how the address bus and data bus are used in relation to the fetch and store stages of the machine instruction cycle.

The address bus and the data bus transfer the info to those stages

decode

The process of converting code into plain text or any format that is useful for subsequent processes.

Data Bus

a system within a computer or device, consisting of a connector or set of wires, that provides transportation for data.

Identify which components of the central processing unit (CPU) are involved during the execute stage of the machine instruction cycle.

control unit

Explain the machine instruction cycle.

fetch, decode, execute, store

Explain why the program counter (PC) is usually incremented once per instruction cycle.

incremented and contains the address of the next machine instruction (in memory) This is done to prepare the CPU for the next instruction execution cycle.

Store

the action of saving information for later use. With computers, you store information on a storage device, such as an internal hard drive, optical disc drive, or an external storage device.

Fetch

the retrieval of data by a software program, script, or hardware device.

Execute

to run the program in the computer, and, by implication, to start it to run.