Rambus develops 56G SerDes PHY on Samsung’s 10nm LPP process

This entry was posted on Thursday, April 20th, 2017.

Rambus has confirmed that its recently launched 56G SerDes PHY will be developed on Samsung’s 10nm LPP (Low-Power Plus) process technology.

According to Luc Seraphin, senior vice president and general manager of the Rambus Memory and Interfaces Division, the 56G SerDes PHY delivers enterprise-class performance across the challenging signaling environments typical of high-speed communication systems and provides PAM-4 and NRZ signaling with a scalable ADC-based (analog-to-digital converter) architecture.


The new, flexible architecture addresses the long-reach backplane requirements for the industry transition to 400 GB Ethernet applications.

“There is a demand for increased bandwidth and higher performance systems with the rise of data across enterprise applications,” Seraphin explained. “Our partnership with Samsung enables us to bring more solutions quickly to market that address the process, power and performance challenges of today’s complex data centers. We are pleased Samsung has selected to work with us, following our successful partnership of the 28G SerDes PHY on their 14nm LPP process technology.”

Ryan Lee, vice president of the Foundry Marketing Team at Samsung Electronics, expressed similar sentiments.

“Network application is one of our key segments of focus and the composition of our 10LPP network solution and the Rambus 56G solution will be the most competitive choice for high-performance and low-power consumption,” said Lee. “Rambus has been a long-term strategic partner with Samsung for high-speed SerDes IP and this 56G SerDes collaboration will pave the way for the explosive data processing requirements to come.”

With a scalable ADC-based (analog-to-digital converter) architecture, the Rambus 56G SerDes FinFET PHY provides both PAM-4 and NRZ signaling, offering a flexible solution that addresses the needs of long-reach backplane requirements as the industry transitions from 100Gb to 400Gb Ethernet applications.

According to Bill Fuller, senior director of field application engineering at Rambus, the 56 Gbps Multi-Protocol SerDes (MPS) PHY is a PAM-4 and NRZ compliant IP solutions that offers reliable performance across challenging long-reach data center environments.

“The 56G MPS supports PAM-4 and NRZ signaling and data rates from 9.95Gbps to 58Gbps across copper and backplane channels with more than 35dB insertion loss,” he explained. “At the heart of the SerDes architecture is an ADC (analog to digital converter) operating at 28 GS/s that allows for adjustable power consumption and improved performance while providing low BER (Bit Error Rate) for enterprise class reliability.”


As Fuller notes, the 56G MPS is designed with a system-oriented approach that takes the interface, interconnect and channel into account when optimizing performance and features to maximize flexibility in today’s most challenging system environments and applications.

“This makes the PHYs ideal for many long-reach, copper and backplane enterprise environments,” he stated.

Key product highlights include an analog Rx CTLE with combined 12 dB of peaking gain, digital Tx/Rx FFE and DFE, support for Ethernet auto negotiation and multiple lane configurations to facilitate flexible ASIC floorplan integration. The 56G MPS also offers BIST with PRBS generators and checkers, extensive debug capabilities and interfaces using an internal microprocessor, as well as LabStation™ software and scripts for enhanced bring-up and validation.


Additional features include support for up to 8 duplex Lanes and data rates in the range of 9.95 Gbps – 58 Gbps, RX front end with on-chip capacitors to support both AC-coupled and DC-coupled channels, configurable architecture that enables power saving models for low and medium loss channels, as well as a flexible ASIC interface for sharing impedance codes amongst multiple PMAs and reducing the number of external reference resistors for on-chip impedance calibration.

The 56G MPS also offers programmable TX/RX equalizers, a centralized LC-PLL that supports a wide range of reference clock frequencies and lane operating frequencies, differential reference clock inputs that are selectively sourced from dedicated pins or internal ASIC interface pins, direct register control for all PMA functions, as well as a flexible layout to support placement along all edges in an ASIC.

Interested in learning more about our 56 Gbps multi-protocol SerDes PHY? You can check out our product page here and download our product brief here.

Download SerDes Signal Integrity Challenges at 28Gbps and Beyond