Computer Organization and ArchitectureComputer Science & Information Technology

What do you mean by Flynn’s Classification?

Categorizes computer architectures based on the number of instruction and data streams.

1. Single Instruction Stream, Single Data Stream (SISD): A computer with a single processor is called a Single Instruction Stream, Single Data Stream (SISD). It represents the organization of a single computer containing a control unit, a processor unit, and a memory unit. Instructions are executed sequentially and the system may or may not have internal parallel processing. Parallel processing may be achieved by means of a pipeline processing. Single Instruction Stream, Single Data Stream

  • CU : Control unit
  • PU : Processor unit
  • MU : Memory unit
  • IS : Instruction stream
  • DS : Data stream

2. Single Instruction Stream, Multiple Data Stream (SIMD): It represents an organization of computer which has multiple processors under the supervision of a common control unit. All processors receive the same instruction from the control unit but operate on different items of the data.

SIMD

  • CU : Control unit
  • PU : Processor unit
  • MU : Memory unit
  • IS : Instruction stream
  • DS : Data stream
  • SM : Shared memory

3. Multiple Instruction Stream, Single Data Stream (MISD): It refers to the computer in which several instructions manipulate the same data stream concurrently. In the structure different processing element run different programs on the same data.

MISD

  • CU : Control unit
  • PU : Processor unit
  • MU : Memory unit
  • IS : Instruction stream
  • DS : Data stream
  • SM : Shared memory

4. Multiple Instruction Stream, Multiple Data Stream (MIMD): MIMD computers are the general purpose parallel computers. Its organization refers to a computer system capable of processing several programs at a same time.

MIMD

  • CU : Control unit
  • PU : Processor unit
  • MU : Memory unit
  • IS : Instruction stream
  • DS : Data stream
  • SM: Shared Memory

 

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