Structural Hazards

Duration: 4 min

This video lesson is available to enrolled students.

Return to /learn/SSC-JE-IMD-SCIENTIFIC-ASSISTANT-COMPUTER-SCIENCE/computer-organisation-architecture/pipelining/structural-control-hazards/asset-structural-hazards after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. General Intelligence & Reasoning: Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Data Sufficiency, Puzzle Solving (Puzzles), Data Arrangement, Cubes & Dices, Calendar, Clock, Arithmetic, Number System, HCF LCM, Verbal Analogy (Word Based Analogy), Visual Recognition and Figure Completion, Paper Folding and Cutting, Transformation of Shapes, Clocks and Calendars, Direction Sense, Cubes and Dice, Patterns in Two-Dimensional Figures, Seating Arrangements, Analogy and Classification, Logical Deduction and Induction, Alphabet and Word Tests, Mathematical Operations, Series Completion, Simplification and Approximation, Coding and Decoding, Numerical Reasoning, Assembling and Grouping of Shapes, Three-Dimensional Patterns and Visualization, Vocabulary, Number System, Averages, Mixtures and Alligation, Simple and Compound Interest, Percentages, Algebra, Speed, Time and Distance, Seating and Arrangement Puzzles, Traverse Surveying, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Reading Comprehension, Critical Reasoning, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Powers, Surds and Logarithms, Sequences and Series, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Powers and Exponents (Surds and Indices), Permutation and Combination
  2. General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs, Artificial Intelligence, MS Office Applications, Terms & Abbreviations, Keyboard Shortcuts, Evolution of Indian Banking (Banking & Financial Awareness), Emerging Tech Trends
  3. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus, Probability, Statistics, Signal Space and Optimum Detection, Probability, Statistics
  4. Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Number Systems and Codes, Registers and Counters, Boolean Algebra and Logic Gates, Microprocessors and Microcontrollers, Logic Families and CMOS Logic, Microprocessors, Logic Gates and Boolean Algebra, Minimization of Boolean Functions, Timing, Hazards and Testing, Logic Families, Combinational Logic Design, Arithmetic Circuits, Waveform Generators and Timer Circuits, Semiconductor Memories and Programmable Logic Devices, Combinational Logic Circuits, Latches and Flip-Flops, Finite State Machines, Sequential Circuits and State Machines, Minimization of Boolean Functions, Arithmetic Circuits, Latches and Flip-Flops, Number Systems and Codes, Registers and Counters
  5. Computer Organisation & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer, Register Transfer and Microoperations, Semiconductor Memories and Programmable Logic, Processor Organization and Instructions, Memory Hierarchy and Input/Output, Registers and Counters
  6. Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, HTML Basics, OOPS with C++, Java, Object Oriented Technology
  7. Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  10. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Security, Windows OS, Distributed Systems, Unix OS, Linux OS
  12. Computer Networks: Introduction to CN, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics, Data Communication, Website, Browser & Services, Web Design & Development, Network Security, Cyber Threats and Malware Attacks, Cyber Safety and Security
  13. Full Length Mock Tests:
  14. Sectional Tests:
  15. Paper 2 - Full-length Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This academic lecture focuses on the concept of 'Hazards/ dependency' within computer architecture pipelines. The instructor begins by stating that full efficiency in executing instructions is often unattainable due to specific dependencies or hazards. The presentation slide outlines three primary categories of these hazards: 'Structural hazards', 'Control hazards', and 'Data hazards'. The session then transitions into a detailed examination of structural hazards, explaining that even with a multi-stage pipeline, dependencies can occur due to external hardware components like the system bus or memory. The lecture uses diagrams to illustrate how these resource conflicts lead to stalls, reducing overall speedup and efficiency.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a slide titled 'Hazards/ dependency'. The instructor explains that pipeline efficiency is compromised by certain dependencies. The slide lists three bullet points: 'Structural hazards', 'Control hazards', and 'Data hazards'. As the instructor speaks, red checkmarks appear next to each item sequentially. He emphasizes that these are the reasons why instructions cannot always execute with full efficiency. The visual progression of the checkmarks guides the viewer through the classification of hazards that will be discussed in the course. The slide also features the 'KnowledgeGate' logo and the instructor's name 'Sanchit Jain Sir' in the bottom left corner, establishing the educational context.

  2. 2:00 – 4:23 02:00-04:23

    The topic shifts to 'Structural Hazards'. The slide text explicitly states: 'Even by having 'm' stages in a pipeline processor... there will be dependence because of external h/w a part from CPU like system bus, memory etc.' A hand-drawn diagram shows a pipeline with blocks labeled 'Fetch Decode', 'Data read logic', 'ALU', and 'Data write logic', all connected to a 'Memory (cache)' block. The instructor draws red checkmarks on these blocks. He then presents a timing diagram showing instructions I1 and I2. He writes numbers 1 through 7 above the stages. The diagram reveals that I2 encounters 'X' marks (stalls) because it attempts to access memory simultaneously with I1. This visualizes the structural hazard where resource contention forces the pipeline to stall, decreasing efficiency. The text also mentions that resource duplication is a solution but is costly.

The lecture systematically builds an understanding of pipeline hazards, starting with a broad classification and narrowing down to structural hazards. The instructor uses clear visual aids, including a slide listing the three hazard types and a detailed pipeline diagram. The core lesson is that structural hazards arise from resource contention, specifically memory access conflicts, which force the pipeline to insert stalls (indicated by 'X' in the timing diagram). This reduces the theoretical speedup of the pipeline. The instructor concludes by noting that while duplicating resources can eliminate these hazards, the high implementation cost makes it a trade-off. This progression helps students understand not just the definition, but the practical impact and mitigation strategies for structural hazards in processor design, linking the theoretical concept to the physical hardware limitations shown in the diagram.

Loading lesson…