TCP Offload Engine

LightSpeed TCP

The lowest-latency, highest-speed, lightest FPGA-based TOE on the market today.

LDA Technologies, in partnership with Solarflare, introduce Lightspeed v2: an FPGA-based TCP offload engine with:

Less than 5 ns* processing latency
Cut-through operation: starts sending the packet while payload write is in progress
256 TCP connections per instance
16-bit / 644 Mhz MAC side interface
256-bit client-side interface**

The Lightspeed v2 is designed for Xilinx U+ and Xilinx Versal FPGA boards and, like its predecessor, requires an Onload™-enabled Solarflare NIC.

_{* < 5 (4.5) ns when the client-side interface clock is running at >500 Mhz.}
_{** Client-side interface clock is asynchronous and can be as low as 322 Mhz.}

Features

Ultra-Low Latency

Less than 5 ns with 644MHz clock:

3 clocks on TX
4 clocks on RX

Minimal FPGA Resource Utilization

For 256 TCP connections:

Standalone TX Core: 14 BRAM, ~2000 CLB LUT's
TX + RX Core: 30 BRAM, ~4200 CLB LUT's

Simple AXI Streaming Data Interface: Sideband channel for payload CRC and length for cut-through operation.; Fmax 644 Mhz with Xilinx Ultrascale+ FPGA

Continuous Transmission Support: Based on window size monitoring

TCP Options Support: Window scaling; MSS; Contact LDA for additional options

Architecture

The Lightspeed v2 consists of an LDA TCP Agent library running on a server with a Solarflare Onload-enabled adapter and FPGA-based TCP Offload IP cores. The agent library manages TCP sessions while the offload cores leverage FPGA capabilities for ultra-fast packet delivery.

This product contains technology proprietary to LDA Technologies, together with patented technology from Solarflare (US patents: 9003053, 9600429, 9258390, 9456060)