SISD Architecture (Single Instruction, Single Data) Computer Architecture - Unit IV: Parallel Processing Instituto Tecnológico de Comitán Instructor: M. en S. Paulo Eduardo Chapela Gómez Semester: August-December 2025 What is SISD? • SISD stands for Single Instruction, Single Data. • It is the simplest and most traditional computer architecture. • A single processor executes one instruction at a time on one data stream. • Example: A traditional sequential CPU. How SISD Works • The Control Unit (CU) fetches and decodes one instruction at a time. • The ALU executes that instruction using data from memory. • The result is stored back in memory or a register. • Process: 1. Fetch → 2. Decode → 3. Execute → 4.Store SISD Diagram Typical SISD Model: | Control Unit | | ALU/CPU Core | | Memory | | Data Stream | Examples of SISD Systems • Early computers: IBM 360, Intel 8086, Motorola 68000. • Most modern personal computers (when using a single core). • Sequential programs (e.g.,...
A chipset is a collection of integrated circuits on a computer's motherboard that manages the flow of data between the processor, memory, and peripheral devices. It functions as a "traffic controller," dictating how components communicate with each other and establishing the capabilities of the motherboard itself. Core functions of a chipset Controls data flow. The chipset acts as the communication hub, ensuring that data moves smoothly and efficiently between components like the Central Processing Unit (CPU), Graphics Processing Unit (GPU), Random Access Memory (RAM), and storage devices. Determines compatibility: The chipset is a key factor in deciding which processors, types of RAM, and expansion cards (e.g., graphics and storage) are compatible with your motherboard. A CPU must be able to communicate with the chipset to function correctly. Manages peripherals: It controls input/output (I/O) devices by managing connections like USB ports, SATA connectors for storage d...
RISC (Reduced Instruction Set Computer) RISC is the way to make hardware simpler whereas CISC is the single instruction that handles multiple work. In this article, we are going to discuss RISC and CISC in detail as well as the difference between RISC and CISC. Let's proceed with RISC first. Reduced Instruction Set Architecture (RISC) The main idea behind this is to simplify hardware by using an instruction set composed of a few basic steps for loading, evaluating, and storing operations, just like a load command will load data; a store command will store the data. Characteristics of RISC Simpler instruction, hence simple instruction decoding. Instruction comes undersize of one word. Instruction takes a single clock cycle to get executed. More general-purpose registers. Simple Addressing Modes. Fewer Data Types. A pipeline can be achieved.
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