Direct Mapping Part-1

Duration: 7 min

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Module outline

  1. About Course: UPPSC Course Overview
  2. Interview Preparation & Guidance: Interview Preparation
  3. Paper 1 | General 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, वर्णमाला, समास, संधि, 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)
  4. Paper 2 | General Studies: State Wise GK, Polity, Geography, History, GK- Current Affairs
  5. Paper 1 | Programming Language: Language Design, C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, OOPS with C++
  6. Paper 1 | Database Management Systems: 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, ORDBMS, NoSQL
  7. Paper 1 | Cyber Security: Society, Law & Ethics, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing, Electronic Data Interchange and E-Commerce, Physical Security and Cryptography Basics, Intrusion Detection Systems (IDS), Cyber Safety and Security, Ethical Hacking
  8. Paper 1 | Computer Organization and Architecture: Basics of COA, Programming the Basic Computer, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Register Transfer and Microoperations, Control Unit Design
  9. Paper 1 | Computer Networks: 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 Security
  10. Paper 1 | Design and Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  11. Paper 1 | Data Structures: Introduction to DS, Array, Linked List, Stack, Queue, Tree, Graphs, Hashing
  12. Paper 1 | Discrete Structures and Theory of Logic: Permutation and Combination, Set Theory, Relations, Functions, Propositional and Predicate Logic, Graph Theory, Group Theory
  13. Paper 1 | Software Project Management: Software Project Management
  14. Paper 2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Unix OS, Linux OS, Security
  15. 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, Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Pushdown Automata & CFG, Complexity Theory
  16. Paper 2 | Artificial Intelligence & High Performance Computing: Approaches to AI, Search Algorithms, Game Playing, Knowledge Representation, Planning, Multi Agent Systems, Natural Language Processing, Emerging Tech Trends
  17. Paper 2 | Image Processing: Digital Image Fundamentals, Image Enhancement, Image Restoration, Color Image Processing, Image Compression
  18. Paper 2 | Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  19. Paper 2 | Computer Graphics: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing
  20. Paper 2 | Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, HTML Basics, JavaScript-Basics, Java
  21. Paper 2 | Soft Computing: Fuzzy Sets, Artificial Neural Networks, Genetic Algorithms
  22. Paper 2 | Distributed System: Distributed Systems
  23. UPPSC Live Class Recordings: UPPSC Polytechnic Lecturer 2025 (CS)
  24. Previous Year Papers:
  25. Mock Test:
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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