Ultra-short reach SerDes with 500 Gbit/s throughput

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

• 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

• 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

• 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

• 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