enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Instruction cycle - Wikipedia

    en.wikipedia.org/wiki/Instruction_cycle

    The instruction cycle (also known as the fetchdecodeexecute cycle, or simply the fetchexecute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions. It is composed of three main stages: the fetch stage, the decode stage, and the execute stage.

  3. Execution (computing) - Wikipedia

    en.wikipedia.org/wiki/Execution_(computing)

    The instruction cycle (also known as the fetchdecodeexecute cycle, or simply the fetch-execute cycle) is the cycle that the central processing unit (CPU) follows from boot-up until the computer has shut down in order to process instructions. It is composed of three main stages: the fetch stage, the decode stage, and the execute stage.

  4. Instruction pipelining - Wikipedia

    en.wikipedia.org/wiki/Instruction_pipelining

    The blue instruction, which was due to be fetched during cycle 3, is stalled for one cycle, as is the red instruction after it. Because of the bubble (the blue ovals in the illustration), the processor's Decode circuitry is idle during cycle 3. Its Execute circuitry is idle during cycle 4 and its Write-back circuitry is idle during cycle 5.

  5. Classic RISC pipeline - Wikipedia

    en.wikipedia.org/wiki/Classic_RISC_pipeline

    The data hazard is detected in the decode stage, and the fetch and decode stages are stalled - they are prevented from flopping their inputs and so stay in the same state for a cycle. The execute, access, and write-back stages downstream see an extra no-operation instruction (NOP) inserted between the LD and AND instructions.

  6. Central processing unit - Wikipedia

    en.wikipedia.org/wiki/Central_processing_unit

    Nearly all CPUs follow the fetch, decode and execute steps in their operation, which are collectively known as the instruction cycle. After the execution of an instruction, the entire process repeats, with the next instruction cycle normally fetching the next-in-sequence instruction because of the incremented value in the program counter. If a ...

  7. Out-of-order execution - Wikipedia

    en.wikipedia.org/wiki/Out-of-order_execution

    The first machine to use out-of-order execution was the CDC 6600 (1964), designed by James E. Thornton, which uses a scoreboard to avoid conflicts. It permits an instruction to execute if its source operand (read) registers aren't to be written to by any unexecuted earlier instruction (true dependency) and the destination (write) register not be a register used by any unexecuted earlier ...

  8. Branch predictor - Wikipedia

    en.wikipedia.org/wiki/Branch_predictor

    Both CPUs evaluate branches in the decode stage and have a single cycle instruction fetch. As a result, the branch target recurrence is two cycles long, and the machine always fetches the instruction immediately after any taken branch. Both architectures define branch delay slots in order to utilize these fetched instructions.

  9. Instruction register - Wikipedia

    en.wikipedia.org/wiki/Instruction_register

    Decoding the op-code in the instruction register includes determining the instruction, determining where its operands are in memory, retrieving the operands from memory, allocating processor resources to execute the command (in super scalar processors), etc.