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TTTech, AMS communications processor offers up to 25Mbps data rate

Posted: 01 Mar 2002 ?? ?Print Version ?Bookmark and Share

Keywords:tttech? austriamicrosystems? communication processor? processor ic? x by wire?

The AS8202 communications processor combines TTTech's Time-Triggered Protocol (TTP) with support for fault-tolerant bus systems, enabling a data rate of 5Mbps in asynchronous mode and up to 25Mbps in synchronous mode.

Jointly developed with austriamicrosystems, the processor is suited for x-by-wire automotive applications needing high availability, such as electromechanical braking and steering systems.

Classical event-driven communication systems, such as CAN-Bus, run asynchronously and are driven by events. In contrast, TTP-based systems communicate over redundant buses and avoid data collision by using specified time intervals.

The 80-pin TQFP device contains 16Kword-by-16-bit Flash memory, 4Kword-by-16-bit boot ROM, and up to 4Kword-by-16-bit SRAMs. The control program is placed in the Flash memory and may be changed according to application requirements, while the sequence needed for system startup is part of the boot ROM. The SRAMs are used to hold communication and other run-time data.

Implemented using a 0.35?m CMOS process, the AS8202 operates from a single 3.3V supply over the temperature range of -40C to 125C.

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