Detail about DDR

1. DDR Memory

2. Memory (Basic)
• Collection of storage cells together
• Involves circuit to transfer information across
• Different device has different memory
architecture

4. RAM/ Random Access Memory
• Volatile memory(information is lost when
power supply OFF)
• When open program, it load it to RAM from
hard disk.
• Consist of multiplexing and demultiplexing
circuit to make data to provided address

5. BLOCK DIAGRAM OF RAM

6. TYPES OF RAM
• SRAM( Static random access memory): Holds
data in static form
• DRAM( Dynamic Random access memory): It
constantly needs to be refreshed and lose
data shortly

7. DRAM FEATURES
• Less power consumption
• Used in main memory
• Needs more memory and needs to be
refreshed constantly.

8. DDR SDRAM
• It is Double Data Rate system
• Increased performance over Single Data Rate.
• Two data transactions occur without doubling the
applied clock
• DDR memory consist of more than 130 signals.

9. DDR SDRAM REGISTERS
• MODE REGISTER: The mode register is used to
define the mode of operation of ddr sdram
• EXTENDED MODE REGISTER: It controls the
operations that are beyond mode registers

10. Commands of DDR SDRAM
• DESELECT
• NO OPERATION
• ACTIVE
• READ
• WRITE
• BURST TERMINATE
• PRE CHARGE
• AUTO refresh

11. ADVANTAGES OF DDR SDRAM
• Comparable Bandwidth level
• Lower latency cost

12. DISADVANTAGES OF DDR SDRAM
• Poor bus efficiency 65%
• Not by Intel

13. COMPARISION

14. DDR4 SDRAM
• Greater bandwidth
• Power Savings
• Performance enhancement

15. THANK YOU