Direct Mapping Part-1

Duration: 7 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Section 1 | Language (Hindi): भाषा, लिपि, ध्वनि, वर्ण, अक्षर, स्वर, व्यंजन, मात्रा और संयुक्ताक्षर, वर्तनी, वर्ण-विन्यास, अनुस्वार, अनुनासिक, चंद्रबिंदु और ‘र’ के रूप, शब्द, पद और शब्द-भेद, संज्ञा और सर्वनाम, विशेषण और क्रिया, लिंग, वचन, पुरुष और कारक, काल, वाच्य, वाक्य और वाक्य-भेद, संधि, समास, विलोम शब्द, पर्यायवाची शब्द, सामान्य अशुद्धियाँ, अनेक शब्दों के लिए एक शब्द, मुहावरे और लोकोक्तियाँ, अपठित गद्यांश और अपठित पद्यांश, Multi-Topic Content (Cross-Concept Material), वर्णमाला
  3. Section 1 | Language (उर्दू भाषा — 22 प्रश्न (निश्चित)): Spelling & Diacritics, Grammar (اسم, فعل, صفت, ضمیر), Vocabulary, Idioms & Proverbs, Comprehension
  4. Section 1 | Language (বাংলা / बांग्ला भाषा — 22 प्रश्न (निश्चित)): Bangla Script and Sounds, Bangla Grammar and Usage, Bangla Word Formation and Vocabulary, Reading and Text Interpretation
  5. Section 1 | Language (English): Vocabulary, Noun, Subject Verb Agreement (Verb Noun Agreement), Adjectives, Tenses, Pronoun, Verb, Adverb, Preposition, Articles, Determiner, Conjunction, Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Verbal Analogy (Word Based Analogy), Facts, Inference and Judgements
  6. Section 2 | Primary Maths & Reasoning: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Percentage, Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Mensuration and Geometry, Age Problems, Arithmetic, Powers and Exponents (Surds and Indices), Algebra, Probability, Trigonometry, Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Data Arrangement, Inequality, Analogy, Ranking, Order and Sequence
  7. Section 2 | General Awareness (GK + Current Affairs): Polity, Physics, Biology, State Wise GK, Chemistry, History, Geography, Indian Economy, Environment, GK- Current Affairs, Static General Knowledge
  8. Section 3 | Computer System and Org. (CSO): Basics of COA, Floating Point Rep, Cache Memory Organization, Instr Formats & Modes, Programming the Basic Computer, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design
  9. Section 3 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control
  10. Section 3 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Process Synchronization
  11. Section 3 | Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics
  12. Section 3 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Minimum Spanning Trees, Shortest Path Algos
  13. Section 3 | Theory Of Computation & Compiler Design: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization
  14. Section 3 | Emerging Trends (AI, Societal Ethics & MS Office): Artificial Intelligence, Emerging Tech Trends, Society, Law & Ethics, MS Office Applications
  15. Section 3 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Maintenance and Configuration Management, Software Testing
  16. Section 3 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Section 3 | OOPS, C++, JAVA, HTML: OOPS with C++, Java, HTML Basics, CSS
  18. Section 3 | Java: Java Fundamentals, Array, String, IO & References
  19. Section 3 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  20. Section 3 | Digital Electronics: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  21. Section 3 | Multimedia: Multimedia
  22. BPSC Previous Year Papers:
  23. BPSC Full Mock Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video provides a comprehensive overview of Direct Mapping in computer architecture. It starts with the definition and visual representation, moves to the mathematical logic using modulo arithmetic to find cache addresses, and concludes with the structural organization of the cache including tags and data words. This progression helps students understand both the theoretical mapping and the practical implementation in cache memory. The instructor uses clear diagrams and handwritten calculations to reinforce the concepts.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video begins with a slide titled "Direct Mapping". The text defines the scheme: "In direct mapping scheme the main memory blocks are directly mapped onto a particular cache memory line." It is also noted as "many to one mapping". A diagram illustrates this with a "Cache" section containing lines (Line 0, Line 1, etc.) and a "Memory" section with blocks (Block 0, Block 1, etc.). Lines connect specific memory blocks to specific cache lines, visually demonstrating the direct mapping relationship. The instructor explains that main memory blocks are mapped directly to cache lines, establishing the fundamental concept of the lecture. The slide also shows blocks like Block 256 and Block 512 mapping to specific lines, hinting at the modulo relationship.

  2. 2:00 – 5:00 02:00-05:00

    The visual changes to a simplified diagram with Cache Lines (CL-0 to CL-3) on the left and Memory Blocks (B-0 to B-15) on the right. The instructor draws lines to show the mapping pattern: B-0 to CL-0, B-1 to CL-1, B-2 to CL-2, B-3 to CL-3, and then B-4 loops back to CL-0. He introduces the formula: "Block No / No of Cache Line = Remainder is the Address of block in Cache". He writes calculations like "16 / 4" and circles specific blocks like B-10 and B-7 to demonstrate how the remainder determines the cache line address. He emphasizes that the remainder is the key to finding the cache line, writing "10 / 4 = 2" to show B-10 maps to CL-2.

  3. 5:00 – 7:01 05:00-07:01

    The slide displays a table labeled "Cache Memory" listing CL-0, CL-1, CL-2, CL-3. Next to each line, it lists the memory blocks that map to it (e.g., CL-0 contains B-0, B-4, B-8, B-12). A larger table on the right details the cache structure, showing columns for blocks like B-0, B-4, B-8, B-12 under CL-0. It includes rows for "TAG" and words (W-0, W-1, etc.). The instructor explains that while multiple blocks map to a line, only one can be present at a time, identified by a tag. This section details the physical organization of the cache memory, showing how tags distinguish between the competing blocks. The table shows specific words like W-0, W-1, W-2, W-3 within the blocks.

The video provides a comprehensive overview of Direct Mapping. It starts with the definition and visual representation, moves to the mathematical logic using modulo arithmetic to find cache addresses, and concludes with the structural organization of the cache including tags and data words. This progression helps students understand both the theoretical mapping and the practical implementation in cache memory. The instructor uses clear diagrams and handwritten calculations to reinforce the concepts. The final table clearly shows how tags are used to identify which block is currently stored in a specific cache line, resolving the conflict of multiple blocks mapping to the same line.

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