The Rambus 6G Multi-protocol SerDes (MPS) PHYs are a general-purpose, high-speed serial link subsystem that support data rates from 1.25 Gbps to 6.375 Gbps. Optimized for power and area, they can compete even with single-protocol solutions.
The PHYs include a PMA hard macro that supports a broad range of networking protocols and a PCS-BIST soft macro for PCIe that is PIPE4 compliant. They have a minimal set of broadside control and is configurable in x2, x4 and x8 lane configurations. This gives the PHYs improved flexibility and support for a wide range of applications.
The 6G PHYs feature Built-in-self-test (BIST) with PRBS checker functionality, transmit and receive equalization, and supports a wide range of reference clock multipliers to improve system margin and performance. This ensures the best signal quality and enables greater design flexibility.
Available on TSMC and Global Foundry process nodes.
Maintaining signal integrity has become increasingly difficult as data rates moves past 28Gbps to 56Gbps and beyond. Up to 28Gbps rates, NRZ is the preferred and standardized encoding scheme which consists of 1’s and 0’s. NRZ is also referred to as PAM2 (pulse amplitude modulation, 2-level), due to its two amplitude levels which contain 1 bit of information in every symbol. With serial data rates hitting 56 Gb/s per channel, signal impairments caused by increased bandwidth has prompted the high-speed serial data industry to adopt PAM4, or 4-level pulse amplitude modulation.
Comprehensive Chip and System Design Reviews
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|Protocol||Data Rate (Gbps)||Application|
|PCIe1/2/3||2.5, 5||Graphics cards and high-bandwidth peripherals|
|SATA 1/2/3||1.5, 3, 6||Personal computing and server storage|
|GbE||1.25||Backplane and copper cable networking|
|CEI6-SR||4.976-6.375||Telecom and networking|
|USB 2/3||0.4, 5||Computing and peripheral connectivity|