Ultra-short reach SerDes with 500 Gbit/s throughput

Overview

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. Deploy Glasswing IP in multiple instances to provide efficient extended interfaces

Technology

  •  GlobalFoundries® 12LP process
  •  0.9V and 1.2V analog supplies
  •  0.8V digital supply
  •  Junction temperature -40 to +110 °C
  •  Standard flip chip technology with 150 μm bump pitch
  •  Tile-able layout to support high IO density

CNRZ coding

  • Transmits 5 bits on 6 correlated wires:
    • Balanced code leads to low SSO noise at transmitter
    • Employs a reference-less receiver that is resilient to common-mode noise
    • Uses a receiver that has five comparators and no decoder
  • Link has excellent signal integrity properties:
    • NRZ-like ISI properties
    • Scalable to much higher speeds and harder
    • channels
    • NRZ-like EMI performance

Key Features

  • MCM interface consisting of four 6-wire CNRZ-5 Chords, plus a shared forwarded clock (26 wires total per direction)
  • No silicon interposer required due to standard 150 um bump pitch
  • Maximum throughput of 500 Gbit/s in each direction
  • Line rate programmable from 12.5 to 25 GBd for a throughput of 62.5 to 125 Gbit/s per Chord
  • Total throughput configurable by selecting number of active Chords
  • TX and RX data buses consisting of five 32-bit data words (plus clock) for each Chord
  • Simple word-based TX to RX interface, RX logic recovers data alignment
  • DC-coupled link with no coding/framing requirements; light-weight scrambler in PMA Soft IP ensures sufficient data toggling
  • Configuration and link start-up through APB (ARM Peripheral Bus) interface
  • Internal TX to RX loopback for wafer/die level test
  • Configurable Bolt-On PMA soft IP for ease of use:
    • Scrambler
    • Bit error iniection
    • Single cycle FEC to decrease BER/increase link length
    • Including option to include PRBS to test impact on BER using FEC
    • Far-end loopback
  • RX CTLE equalization for up to 6 dB channel loss at 12.5 GHz
  • TX PLL with reference clock input frequency from 100 MHz to 312.5 MHz (25 MHz supported for Test)
  • Supports JTAG boundary scan (1149.1) and scan test modes (Shift/Capture and Bypass)
  • Integrated diagnostics: PRBS-15 and PRBS-31 pattern generation and verification, RX EyeScope
  • DFT: at-speed BIST of analog plus stuck-at scan (Capture and At-Speed)
  • ATPG support
  • JEDEC JESD247 Multi-wire Multi-level Interface Specification compatible

Benefits

  • 2x to 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
  • 208.3 Gbit/s full-duplex bandwidth per mm of die edge (500 Gbit/s for 2.4 mm of die edge)
  • Supports up to 6 dB channel insertion loss at 12.5 GHz
  • NRZ-like ISI and noise performance

Block Diagram

Ultra-short reach SerDes with 500 Gbit/s throughput Block Diagram

Applications

  • 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

Deliverables

  • Datasheet and application notes
  • Hard IP standard integration views: LEF, LIB, SDC, GDSII, LVS netlist, ATPG netlist
  • PMA Soft IP
  • Verilog Hard IP customer model for system simulation: reference test bench
  • Qualification report
  • Package design and integration guidelines

Technical Specifications

Foundry, Node
GlobalFoundries® 12LP process
GLOBALFOUNDRIES
Pre-Silicon: 12nm
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Semiconductor IP