Flynn's taxonomy categorizes computer architectures into four categories based on whether they have single or multiple instruction and data streams: 1) SISD has a single instruction stream and single data stream, like typical personal computers. It processes instructions and data sequentially. 2) SIMD has a single instruction stream but multiple data streams, allowing the same instruction to operate on multiple data items simultaneously, like in audio/video processing. 3) MISD has multiple instruction streams operating on a single data stream, an uncommon architecture where different processors perform different operations on the same data. 4) MIMD has multiple instruction and data streams, allowing different programs to run simultaneously on different processors, as in multip

1. Flynn’s Classification
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2. Flynn’s Classification
• Multiplicity of Instruction streams and data streams
• Instruction stream : A instruction stream is the process of fetching the
data from the memory
• Data Stream : A data stream is sequence of data having the output
that is the data to access. this Model is called as Flynn’s Taxonomy
• STREAM: Stream is a seq. of instructions or data on which a computer
operates

3. Types of Info. flow into a processor
• Instruction and data
• Based on relation between instruction and data
• either based on Instruction or data -- Single / Multiple
Processor-- the component of a computer system that performs the
basic execute the instructions to get the data

4. Computer Architecture into 4 categories
• SISD -- Single Instruction and single data stream
• SIMD -- SIngle Instruction and Multiple Data stream
• MISD - Multiple Instruction and Single Data stream
• MIMD --Mutiple instructions and Multiple data stream

5. SISD-- eg.PC
• Uniprocessor computers that process one instruction at a time
• Simple type of computer with single Control Unit
• Perform one instruction at a time
• No parallelsim in either instructions or data
• Follow Von Neumann model
• machine instructions are processed in a sequential manner and
computers adopting this model are popularly called sequential
computers
The control unit (CU) is a component of a computer's central
processing unit (CPU) that directs the operation of the processor.

6. SISD

7. SIMD -- eg.audio/video processing
• multiprocessor machine
• Same instruction on all the CPUs but operating on different data streams
• Controller transmit the instruction to all processors
• A single control unit have multiple ALUs (Arithmetic and logic units) to
work on multiple data streams simultaneously.
• different unit refer to diff.operand but same instruction
• Each processor has own memory and communicate with each other
through interconnection network.
• Instructions are globally same by single control Unit

8. SIMD

9. MISD
• Multiprocessor machine capable of executing different instructions
on different PEs but all of them operating on the same dataset
• The system performs different operations on the same data set
• Uncommon Architecture
• The same Stream of data flows thru a linear array of processors
executing diff. instruction streams

10. MISD

11. MIMD
• capability of performing several programs simultaneously
• similar to multiprocessor, in which multiple CPUs are operating
independently to be a part of large system
• Both multiprocessor and multi computer comes under MIMD.
• Communication - Shared memory and Use of Message passing
• Made of multiple processors and memory connected together via
network

12. MIMD

13. Short Form
• processing elements (PE)
• Seq. -- Sequence

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