Memory Extension

Duration: 6 min

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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.

The video presents a detailed lecture on memory mapping and address decoding in computer architecture. The instructor, Sanchit Jain, uses a circuit diagram to explain how a CPU interfaces with multiple memory chips (RAM and ROM). The diagram features a CPU block connected to a 3-to-8 decoder and five memory chips: four RAM chips (labeled 128 x 8) and one ROM chip (labeled 128 x 8). The lecture focuses on determining the address range for each memory chip based on the connections to the decoder and the address bus lines. The instructor demonstrates how to calculate the hexadecimal addresses by analyzing the logic levels of the high-order address bits that control the chip select lines. He also clarifies the role of the lower address lines in accessing specific memory locations within a selected chip.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the memory connection diagram, pointing out the CPU, address bus, and data bus. He identifies the specific memory components: four "128 x 8 RAM" blocks and one "128 x 8 ROM" block. He explains the function of the "Decoder" block, noting that it receives inputs from the upper address lines (16-11) to generate chip select signals (CS1, CS2, etc.). He also points out the "RD" (Read) and "WR" (Write) control lines that are connected to all memory chips, indicating that these signals control the direction of data flow. The visual evidence includes the clear labeling of "Address bus", "Decoder", and the memory blocks, along with the instructor's gestures indicating the flow of signals from the CPU to the memory chips. He establishes the context that the decoder is responsible for selecting which memory chip is active at any given time, while the RD/WR lines control the operation.

  2. 2:00 – 5:00 02:00-05:00

    The instructor begins the practical calculation of address ranges. He focuses on the ROM chip at the bottom of the diagram. He writes "10 -> 0 ROM" and "0 -> 1 RAM" on the screen, indicating that address bit 10 determines whether the ROM or RAM is selected. He circles the address lines AD9, AD8, and AD7, writing the numbers "7" and "8" to highlight their significance in the address calculation. He draws a vertical block diagram representing the memory space, labeling it "1024" and "10", likely referring to the total addressable space or specific bit positions. This section is critical for understanding how to derive the specific hexadecimal address range for each chip based on the decoder inputs and chip select logic. He explains that the "128 x 8" notation means the chip has 128 locations, each storing 8 bits of data.

  3. 5:00 – 5:36 05:00-05:36

    The instructor concludes the explanation by clarifying the role of the lower address lines. He points to the "AD7" line which is common to all chips, explaining that these lines (AD0-AD7) are used for internal addressing within the 128-byte memory chips. He emphasizes that while the decoder selects the chip, the lower bits select the specific byte within that chip. The visual evidence includes his hand gestures pointing to the "AD7" label and the "Data" bus connection. He reinforces the concept that the total address is a combination of the chip select bits (from the decoder) and the internal offset bits.

The lecture effectively bridges the gap between theoretical memory concepts and practical circuit implementation. By analyzing the specific connections in the diagram, the instructor demonstrates how to calculate address ranges for memory chips. The use of the decoder to map high-order address bits to chip select lines is a fundamental concept in memory organization. The instructor's step-by-step calculation, including the writing of logic levels and address bits, provides a clear method for students to solve similar problems. The distinction between chip selection and internal addressing is crucial for understanding how the CPU accesses specific data in a memory system.

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