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