General Description

The AS8202NF communication controller is an integrated device supporting serial communication according to the TTP specification version 1.1. It performs all communication tasks such as reception and transmission of messages in a TTP cluster without interaction of the host CPU. TTP provides mechanisms that allow the deployment in high-dependability distributed real-time systems. It provides the following services:

■ Predictable transmission of messages with minimal jitter

■ Fault-tolerant distributed clock synchronization

■ Consistent membership service with small delay

■ Masking of single faults

Key Features

■ Dual-channel controller for redundant data transfers

■ Dedicated controller supporting TTP (time-triggered protocol class C)

■ Suited for dependable distributed real-time systems with guaranteed response time

■ Asynchronous data rate up to 5 Mbit/s (MFM/Manchester)

■ Synchronous data rate 5 to 25 Mbit/s

■ Bus interface (speed, encoding) for each channel selectable independently

■ 40 MHz main clock with support for 10 MHz crystal, 10 MHz oscillator or 40 MHz oscillator

■ 16 MHz bus guardian clock with support for 16 MHz crystal or 16 MHz oscillator

■ Single power supply 3.3V, 0.35µm CMOS process

■ Full automotive temperature range (-40ºC to 125ºC)

■ 16k x 16 SRAM for message, status, control area (communication network interface) and for scheduling information (MEDL)

■ 4k x 16 (plus parity) instruction code RAM for protocol execution code

■ Data sheet conforms to protocol revision 2.04

■ 16k x 16 instruction code ROM containing startup execution code and deprecated protocol code revision 1.00

■ 16 Bit non-multiplexed asynchronous host CPU interface

■ 16 Bit RISC architecture

■ Software tools, design support, development boards available (www.tttech.com)

■ Certification support package according to RTCA/DO-254 DAL A available (www.tttech.com)

■ 80 pin LQFP80 Package

Applications

Application fields: automotive (by-wire braking, steering, vehicle dynamics control, drive train control), aerospace (aircraft electronic systems), industrial systems, railway systems.