Double Data Rates

1
Double Data Rates

• Memona Hayder
• F24-BSCS-1070
• Sir Inam Ul Haq
• Digital Logic and Design
• Department of Computer Science
• Faculty of Computer Science

2
Introduction

• Double data rates refers to a type of synchronous
  memory dynamic random-random access memory used
  in computers allow data to be transferred on both
  the rising and falling edges of clock signals
  effectively doubling the data transfer rate
  compared to traditional SDM.

3
DDR WORKING

• DDR memory utilizes a technique called
  dual-pumping where data is transferred on both
  the rising and falling edges of the clock
  signals.
• This contrasts with older memory technologies
  that only transferred data on one edge ,
  resulting in slower data transfer rate.

4
Benefits

• DDR memory significantly increases the speed of
  data which can be moved between memory and the
  processor.
• DDR memory improved the performance of overall
  system.
• DDR memory allow computers to handle and run
  multiple applications concurrently more
  efficiently.

5
DDR Versions

• DDR1
• Internal Clock Speed(MHz) 133 to 200
• Bus Clock 133 to 200
• Data Rate(MB/s) 266 to 400
• Voltage 2.5/2.6
• Transfer rate(GB/s) 2.1/2..6

6
DDR2

• Internal Clock Speed(MHz) 133 to 200
• Data Rate(MB/s) 533 to 800
• Transfer Rate(GB/s) 4.2 to 6.4
• Voltage(V) 1.8

7
DDR3

• Internal Clock Speed(MHz) 133 to 200
• Data Rate(MB/s) 800 to 2133
• Transfer Rate(GB/s) 8.5 to 14.9
• Voltage(V) 1.35/1.5

8
DDR4

• Internal clock speed(MHz) 133 to 200
• Data Rate(MB/s) 1600 to
  3200
• Transfer Rate(GB/s) 17 to 21.3
• Voltage(V) 1.2

9
Comparison
10
Applications

• DDR memory is widely used in various devices
• Computers
• Servers
• Mobile Devices like smartphones

11
Conclusion

• DDR as compared to Single Data Rate has
  revolutionized computing by doubling data
  transfer rates .Its enhancing system performance
  and responsiveness . It has also improved power
  efficiency , higher capacity and synchronization
  with the system clock , making it versatile for
  various applications.