Glasswing - GW16-500 SerDes

A set of programmable IPs designed and optimized for in-package applications

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Preliminary data Kandou Bus reserves the right to make changes to the product or this document at any time without notice.


The Glasswing SerDes family is a set of programmable IPs designed and optimized for in-package applications. Glasswing provides high system bandwidth with low power consumption through the use of CNRZ-5-DR-EE Chord™ signaling and a forwarded clock architecture. Glasswing IP may be deployed in multiple instances to provide efficient extended interfaces.

Simplified schematic
Simplified schematic
  • TSMC 16 nm FF+-GL process
  • 0.9V analog, 1.1V HV analog, and 0.8 V or 0.85 V digital supplies
  • Junction temperature -40 to +110 °C
  • Standard flip chip technology
  • Tile-able layout to support high IO density
  • Datasheet and application notes
  • Standard integration views: GDSII, SDC, LEF, Verilog, .lib
  • Reference models and test benches
  • Qualification report
  • Package design and integration guidelines
  • Testability and manufacturing guidelines
  • Evaluation modules
  • Multi-chip modules and short reach interposers:
    • Packaging dies with dissimilar foundry processes
    • Packaging of smaller dies to increase yield
  • High throughput data interfaces:
    • Efficient interface to off-board SerDes tiles
    • Interconnection of tiled CPUs or DSPs
    • Processor or switch to high bandwidth memory
    • Efficient interface to optics engines
    • Switch-to-switch links
  • 2-4x throughput at 50% or less energy consumption as compared to conventional SerDes over the same number of pins/wires
  • High pin-efficiency and low power
  • 417 Gb/s/mm bidirectional data throughput
  • Supports up to 6dB channel insertion loss at 12.5 GHz
  • NRZ-like Inter-Symbol Interference (ISI) performance
  • NRZ-like EMI, SSO and balance properties
  • Data is 5b6w encoded
  • Four groups of five 32 bit RX and TX parallel buses
  • 125 Gb/s over each group of six wires; total throughput of 500 Gb/s in each direction
  • Has a common block with PLL and references
  • DC coupled link requiring no data coding or scrambling
  • Internal TX to RX loopback
  • Programmable TX swing; maximum 300 mVpp single-ended
  • CTLE RX equalization
  • Timing delivered via a forwarded clock and a Clock Data Aligner (CDA) circuit.
  • Programmable RX CDA coefficients
  • EyeScope (non-destructive)
  • Rate is variable from 250 Gb/s to 500 Gb/s through RefClk and PLL control
  • RX bit-slipping control for word alignment
  • PRBS15 and PRBS31 pattern TX generation and RX verification, plus a user defined pattern
  • DFT: at-speed BIST of analogue plus stuck-at scan of slow digital circuitry
  • Supports JTAG boundary scan (1149.1) and scan test modes
  • Analog test port
  • ATPG support
  • APB (ARM Peripheral Bus) interface for easy programming and integration plus a simpler mode
  • Compatible to the JEDEC JESD247 Multi-wire Multi-level Interface Specification
Glasswing 5b6w coding
  • Transmits 5 bits on 6 wires:
    • Has a zero SSO transmitter
    • Employs a reference-less receiver that is resilient to common-mode noise
    • Uses a receiver that has 5 comparators and no decoder
  • Link has excellent signal integrity properties:
    • NRZ-like Inter-Symbol Interference properties
    • Scalable to much higher speeds and harder channels
    • NRZ-like EMI performance
Coded link block diagram
Simplified schematic
Tau simulation
Simplified schematic