Design Con 2015

Ethernet switch handles hard real-time data

August 18, 2009

Christoph Hammerschmidt-August 18, 2009

MUNICH, Germany — Thinking beyond FlexRay: For applications where broadband data transmission are combined with hard real-time requirements, TTTech Computertechnik AG has developed an Ethernet switch that supports standard Ethernet as well as TTEthernet.

Such demanding applications could be future driver assistance systems, combining video signals from several cameras with data streams for carriage and / or steering control systems, explained a spokesperson of Vienna-based TTTech. The company's engineers intend to address situations where complex networking systems require a broadband backbone. While not exclusively designed for in-vehicle applications, the switch supports automotive physical requirements such as extended temperature range. It also can be used in complex data-intensive distributed industrial control systems, the company explained.

In contrast to other real-time enabled Ethernet systems, TTEthernet supports scalability for real-time architectures, based on the IEEE 802.3 Ethernet PHY and MAC layer standard, the vendor claims.

TTTech's switch discriminates three priority levels: 'Time-triggered' signals for data with tightest real-time requirements with defined latency and jitter; 'rate-constraint' for other high priority signals; and 'best-effort' for all other signals.

The switch is available in various implementations for development and / or monitoring purposes. Based on Altera Cyclon III or Stratix II GX FPGAs, the ports support data bandwidths of up to 100 Mbit/s or 1 GBit/s.

Related articles and links:

TTP-Simulate simulates and tests complex TTP systems in real time

AMS, TTTech collaborate on cheaper FlexRay

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