Memory + Interfaces


Designed to meet the memory-intensive workload demands of networking and data center applications, the DDR4 memory PHY delivers maximum performance and power efficiency while maintaining full compatibility with industry standard DDR4 and DDR3.


Product Brief

How DDR4 works

The Rambus DDR4 memory PHY delivers industry-leading data rates of up to 3200 Mbps and is compatible with JEDEC standard DDR4, and DDR3. Designed to meet the needs of the most demanding networking and data center applications, the silicon-proven PHY combines performance and power efficiency with superior design flexibility to provide customers with a differentiated and easy to integrate solution.

The PHY consists of a Command/Address (C/A) macro cell and Data (DQ) macro cells configured to create a 72 bits wide channel.

R+ DDR4/3 PHY Subsystem Example

DDR4 PHY Subsystem Example

Solution Offerings

Protocol Compatibility

ProtocolData Rate (Gbps)Application
DDR41600-3200Data Center and Networking
DDR3 (1.5V)1066-2133Data Center and Networking
DDR3L (1.35V)1066-2133Data Center and Networking
DDR3U (1.25V)1066-2133Data Center and Networking


FlexPhase™ Timing Adjustment Circuits


FlexPhase per bit timing adjustment circuits deskew data and clock signals to improve signal integrity and simplify package and PCB system design.

Output Driver Calibration

Output driver calibration allows SoC designers to tune the output signaling to optimal levels in order to improve data rates and system voltage margin.

On Die Termination (ODT) Calibration


ODT calibration enables higher data rates and superior DRAM device and module performance by establishing the optimal termination value to compensate for variations in process and operating conditions that degrade signal performance.

From the blog

Related Markets & Applications

Data Center

Enterprise & Cloud