Instruction Execution Cycle Basics

The four main stages of the instruction execution cycle are: 1. Fetch (IF - Instruction Fetch): The CPU fetches the next instruction from memory. 2. Decode (ID - Instruction Decode): The CPU decodes the instruction to understand the operation that needs to be performed. 3. Execute (EX - Execution): The actual operation specified by the opcode is carried out. 4. Store (MEM - Memory Write/Read): This stage involves writing data to memory or fetching necessary data for instructions that read from memory.

The Decode stage involves extracting the opcode (operation code) of the instruction from the instruction register and understanding the operands and addressing modes that may be decoded during this stage.

Arithmetic or logical operations are performed during the Execute (EX - Execution) stage of the instruction execution cycle.

<p>The program counter (PC) holds the memory address of the next instruction to be fetched from the memory.</p> Signup and view all the answers

<p>The cycle of the instruction execution cycle repeats for each instruction processed by the CPU after the Store (MEM - Memory Write/Read) stage.</p> Signup and view all the answers

<p>Fetch (IF - Instruction Fetch) = The CPU fetches the next instruction from the memory and loads it into the instruction register (IR) Decode (ID - Instruction Decode) = The CPU decodes the instruction to understand what operation needs to be performed and extracts the opcode (operation code) Execute (EX - Execution) = The actual operation specified by the opcode is carried out, and data may be manipulated Store (MEM - Memory Write/Read) = If the instruction involves writing data to memory, this stage is where the write-back to memory occurs</p> Signup and view all the answers

<p>Program Counter (PC) = Holds the memory address of the next instruction during the Fetch stage Instruction Register (IR) = Where the fetched instruction is loaded during the Fetch stage Opcode = Identifies the operation to be performed and is extracted during the Decode stage Memory = Location from which instructions are fetched and to which data may be written during the Store stage</p> Signup and view all the answers

<p>Fetching the next instruction from memory = Fetch (IF - Instruction Fetch) Decoding the instruction and extracting opcode = Decode (ID - Instruction Decode) Performing arithmetic or logical operations = Execute (EX - Execution) Writing back data to memory or fetching necessary data = Store (MEM - Memory Write/Read)</p> Signup and view all the answers

<p>Carrying out the actual operation specified by the opcode = Execute (EX - Execution) Reading from memory or writing data back to memory = Store (MEM - Memory Write/Read) Understanding what operation needs to be performed and decoding the opcode = Decode (ID - Instruction Decode) Fetching the next instruction from memory and loading it into IR = Fetch (IF - Instruction Fetch)</p> Signup and view all the answers

<p>Instruction Execution Cycle = The process through which a CPU fetches, decodes, and executes instructions Machine Cycle = Another name for the instruction execution cycle, consisting of fetch, decode, execute, and store stages Opcode = The operation code extracted during the Decode stage to identify the operation to be performed Program Counter (PC) = Holds the memory address of the next instruction during the Fetch stage</p> Signup and view all the answers