Structural Hazards

Duration: 4 min

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Module outline

  1. About Course: About the Course
  2. Paper-2 | 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
  3. Paper-2 | Databases / DBMS & SQL: 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
  4. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  5. Paper-2 | Computer Networks & Security: Introduction to CN, Data Communication, 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, Network Access Technologies, Network Security
  6. Paper-2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  7. Paper-2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  8. Paper-2 | 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
  9. Paper-2 | Computer Organization & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  10. Paper-2 | 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. Paper-1 | General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, GK- Current Affairs, History, Geography, Indian Economy, Environment
  12. Paper-1 | Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Data Interpretation, Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Clock, Calendar, Cubes & Dices, Directions (Direction Test), Analogy, Seating Arrangements, Analytical Reasoning (Counting Figures Reasoning)
  13. Paper-1 | Quantitative Aptitude: Ratio and Proportion (Ratios), Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Speed Time and Distance, Average, Age Problems, Percentage, Profit and Loss, Time and Work, Pipe and Cistern, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Probability, Statistics, Arithmetic, Algebra
  14. Paper-1 | English: Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Cloze Test (Cloze Passage)
  15. Coal India Previous Year Paper:
  16. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus
  17. Coal India Mock Test:
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.

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