The Safe COTS computer boards A602 (6U VMEbus) and D602 (6U CompactPCI) have been developed according to DO-254 especially for airborne (up to DAL-A) or railway ( up to SIL 4) applications.
Both boards provide complete triple redundancy of the hardware. Each of them provide three PowerPC 750 processors running in lock-step mode with 2-out-of-3 voting implemented in FPGA and software-assisted resynchronization, while their triple redundant dynamic 512MB memory automatically corrects upsets caused by cosmic radiation (SEU) and hardware faults. The system is powered by redundant local power supplies with separate power supplies for the three CPUs and the three main memory banks.
By building up a lock-step architecture, software overhead is kept extremely low, because virtually the hardware components are visible only once for the programming.
Standard I/O of both boards is realised in the FPGA and is accessible at the rear. For realising additional I/O, two PMC slots are provided on each board. The first can be accessed via front or rear I/O and can be used with all standard PMC modules. The second slot is speically reserved for connection of an AFDX PMC via rear I/O.
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