Computer Architecture and Organization

Memory Organization & Cache Memory

Memory Organization & Cache Memory

High-Yield Revision Hub

Master Memory Organization & Cache Memory

Memory Hierarchy, RAM (SRAM/DRAM), ROM, Cache Mapping (Direct, Set-Associative, Associative), Virtual Memory, Paging.

Concept Breakdown

Detailed technical explanation

Memory Hierarchy optimizes speed, capacity, and cost per bit. Registers are fastest, followed by L1/L2/L3 Cache, Main Memory (DRAM), and Secondary Storage (SSD/HDD). Virtual Memory uses translation lookaside buffers (TLB) to convert virtual addresses to physical RAM frames.

Key Revision Rules

Essential formulas and core points to memorize

  • 1SRAM (Static RAM) uses flip-flops, is faster and expensive, used in Cache Memory; DRAM (Dynamic RAM) uses capacitors, requires periodic refresh, used in Main Memory.
  • 2Cache Mapping: Direct Mapping (simplest, high conflict misses), Associative Mapping (flexible, zero conflict misses), Set-Associative Mapping (balanced hybrid).
  • 3Locality of Reference: Temporal Locality (recently accessed item accessed again soon) and Spatial Locality (nearby memory addresses accessed together).
  • 4Virtual Memory allows execution of programs larger than physical RAM using Paging and Page Tables managed by MMU.

Common Exam Mistakes

Where students frequently lose marks

Thinking DRAM is faster than SRAM (SRAM is significantly faster because DRAM requires refreshing capacitive charges).
Confusing Temporal locality (time recurrence) with Spatial locality (neighboring address proximity).

Topic Quiz Practice

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Question 1

For each instruction of the program in memory, the CPU goes to-