53G per Lane Optical DSP

Seagull 111

The second-generation Seagull 111 (CFD30201) Optical DSP is designed for optical interconnect of Hyperscale/enterprise data centers, Cloud service providers, wireless service providers, and high-speed data network applications.

Credo’s proprietary PAM4 DSP architecture minimizes die size and utilizes mainstream silicon process technology to deliver optimal cost, power, and performance for the next generation of optical modules. Pluggable optical modules with Credo PAM4 DSPs enjoy the lowest cost-of-ownership and industry-leading performance while using minimal power.

Seagull 111 has industry-leading performance and low power dissipation. It is footprint-compatible with Credo’s Dove 200, enabling the option to design a common PCB for both devices, then selecting the optimal DSP to meet the application needs. It is used in the next generation of low-power, high-performance QSFP28 optical modules that support 100GbE SR2, DR2 applications with PAM4 modulation.

This generation integrates drivers for direct connection to VCSEL and EML, eliminating the need for external drivers and simplifying  the optics interface. The Seagull 111 is designed to utilize designs and software based on the first-generation Seagull 110 hardware and software for a fast, smooth migration to the Seagull 111.


Host Side
2 x 53G PAM4
Line Side
2 x 53G PAM4
Package Size
8mm x 10mm
Operating Temperature
0° to 85°C
Communication Interface
Optical Modules


  • Integrated VCSEL and EML drivers
  • DSP with industry-leading performance
  • Adaptive CTLE and multi-tap DFE and FFE on line and host side receivers
  • Multi-tap FIR filter on line and host side transmitters
  • LOS and LOL detection
  • Diagnostic features including pattern generators and checkers, eye monitor and loopbacks
  • Optimized, compact firmware
  • Low power dissipation

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