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Interface IP

16G Multi-protocol SerDes PHY

The 16G Multi-protocol SerDes PHYs are designed to maximize interface speed in the difficult system environments found in Big Data and cloud applications. It is a complete solution designed with a system-oriented approach to maximize flexibility and ease integration for our customers.

How 16G works

The Rambus 16G Multi-protocol SerDes (MPS) PHYs are a high-performance serial link subsystem. Optimized for power and area in challenging, high-loss channels typical of copper backplanes and long runs of cable, our 16G MPS PHYs are ideal for networking, telecom and data center systems. The PHYs come complete with a PMA hard macro that supports a broad range of protocols and a PCS soft macro for PCIe that is PIPE4.2 compliant. They have a minimal set of broadside control and are configurable in x2, x4 and x8 lane configurations. This gives the PHYs improved flexibility and support for a wide range of applications.
MPSL Subsystem Example 1.25-16

MPSL Subsystem Example

In order to improve system margin and performance, our solution features transmit and receive equalization, data rate negotiation, and equalization adaptation. This ensures that data is recovered even in the presence of channel and system interference.

Available on TSMC, Global Foundry and Samsung process nodes.

Solution Offerings

  • Duplex lane configurations of x2, x4, and x8
  • Transmit swing of at least 800mV differential peak-to-peak for MR & LR, 360mv for SR
  • Support for AC-coupled interfaces
  • Fine-grain power up/down capability for power optimization, and ability to turn off unused link(s)
  • BER of 10-15 for CEI11-LR/SR and BER of 10-12 for SFI, XFI, PCIe and Gbe protocols
  • A wide range of PLL multiplication supporting low reference clock frequencies
  • Flexible ASIC clocking
  • Tight skew control of 2UI between lanes of the PMA
  • 3-tap Tx Finite Impulse Response (FIR) equalizer with multi-level de-emphasis
  • Deterministic latency with in +-1UI variation for Tx lane
  • Continuous time linear equalizer (CTLe) with programmable settings providing up to 12dB gain peaking at Nyquist frequencies
  • 6-tap Rx dFe (decision feedback equalizer)
  • Second-order CDR meeting SSC and RX sinusoidal jitter requirements
  • Expandable register interface enabling communication with multiple PMAs and PCS-bIST soft macros
  • Built-in Self Test (BIST) with ATPG and AC/DC boundary scan support
  • Built-in PRBS pattern generation and checking for standalone loopback testing
  • In-situ real-time monitoring and receive data eye schmoo
  • Operation across a wide temperature range (-40 C to +125 C)
  • PMA Hard Macro
    • Verilog models
    • LEF abstracts (.lef)
    • Timing models (.lib)
    • CDL netlists (.cdl)
    • ATPG models
    • IBIS-AMI models
    • GDSII layout
    • DRC & LVS reports
  • PCS-BIST Soft Macro
    • RTL model
  • Datasheet
  • SoC Integration guide
  • Optional design integration and bring-up support services

Protocol Compatibility

ProtocolData Rate (Gbps) Application
PCIe2.5, 5, 8, 16Graphics cards and high-bandwidth peripherals
SATA1.5,3,6Storage connectivity
SAS3, 6, 12Server systems storage
10GBase-KR10.3125Copper backplane networking
1000Base-KX1.25Backplane and copper cable networking
10GBase-KX43.125, 6.25Copper backplane networking
XAUI/2xXAUI3.125, 6.25Chip-to-Chip connectivity
CEI6-SR4.976-6.375Telecom and networking
CEI11-SR, LR9.95-11.2Telecom and networking
XFI9.95-11.2XFP and SFP+ Optical Modules
Interlaken 6 G & 10 G4.976-6.375, 10.3125 Networking
HMC 2.015High performance computing
Fibre Channel4.25/8.5/14.025Enterprise storage
JESD204B/C12.5-16.3High-speed data converters connectivity
CPRI v5.61.2288-10.1376Wireless Base Stations
SerDes Signal Integrity Challenges at 28Gbps and Beyond

SerDes Signal Integrity Challenges at 28Gbps and Beyond

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. For PAM4 signals, the baud rate equals one-half the bit rate and the Nyquist frequency equals one-fourth the bit rate. Compared to PAM2/NRZ, PAM4 cuts the bandwidth for a given data rate in half by transmitting two bits in each symbol. This allows engineers to double the bit rate in the channel without doubling the required bandwidth.
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Inventions

Phase Interpolator-Based CDR

Reduces cost, power and area of clock and data recovery (CDR) circuit and improves jitter performance in high-speed parallel and serial links versus PLL-based CDRs.

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