Memory interleaving

Memory Interleaving is less or More an Abstraction technique. Though its a bit different from Abstraction. It is a Technique which divides memory into a number of ..

1. 1 Asstt. Prof. vani Malagar

2. Basic Concept for Interleaving Main memory Divide Sections 2 Asstt. Prof. vani Malagar

3. Definition of Interleaving Interleaving is technique for compensating the slow speed of DRAM . 3 Asstt. Prof. vani Malagar

4. Advantages of Interleaving Memory Increases the Bandwidth Improves Performance Processor Transfer Same Point Time Amount of Data 4 Asstt. Prof. vani Malagar

5. What it Does??? System Memory Divide into two ways : 2-way Interleaving 4-Way Interleaving 5 Asstt. Prof. vani Malagar

6. Analyze with Example (2-Way Interleaving Memory ) Consider eating a Plate of Food with a Fork Ist case : 2 Way Interleaving Divide food into 2 –plates Eating with Both Hands using 2 Forks Eating =Processor Fork = Memory 6 Asstt. Prof. vani Malagar

7. 4-way Interleaving 7 Asstt. Prof. vani Malagar

8. Analyze Example 2 8 Asstt. Prof. vani Malagar

9. How Address Placed in Memory Interleaving? 9 Asstt. Prof. vani Malagar

10. MEMORY ADDRESS REGISTER BIT5 BIT4 BIT3 BIT2 BIT1 BIT0 WORD ADDRESS [3 BIT] LSB MODULE ADDRESS [3 BIT] MSB 10 Asstt. Prof. vani Malagar

11. Practically Implement 4 8 12 16 1 5 9 13 17 2 6 10 14 18 3 7 11 15 19 We have consecutive Addresses & 4- Interleaved Modules USE SEQUENTIAL OR PIPELINED MANNER 11 Asstt. Prof. vani Malagar MODULE 0 MODULE 1 MODULE 2 MODULE 3

12. Examples Consider a main memory with m=2 ^a Memory Modules with w=2^b words. What will be the total number of words in all modules ? a=2 B=2 Therefore w=2^ ( a+b ) =2^(2+2)= 16 words Also a==b 12 Asstt. Prof. vani Malagar

13. Memory addressing in Interleaved Memory 13 Asstt. Prof. vani Malagar

14. Asstt. Prof. vani Malagar 14 Thank You !!!