ICS Triplex T8110B Trusted TMR Processor

ICS Triplex T8110B Trusted TMR Processor

Functional Description

The T8110B contains three Processor fault containment regions (FCR), each containing a Motorola Power PC

series Processor and its associated memory (EPROM, DRAM, Flash ROM, and NVRAM), memory mapped I/O,

voter and glue logic circuits. Each Processor FCR has voted two-out-of-three (2oo3) read access to the other

two Processor's FCR memory systems to eliminate divergent operation.

The module's three Processors store and execute the application program, scan and update the I/O modules

and detect system faults. Each Processor executes the application program independently, but in lock-step

synchronisation with the other two. Should one of the Processors diverge, additional mechanisms allow the

failed Processor to re-synchronise with the other two.

Each Processor has an interface which consists of an input voter, discrepancy detector logic, memory, and an

output driver bus interface to the Inter-Module Bus. The output of each Processor is connected by the

module connector to a different channel of the triplicated Inter-Module Bus.

Communication between the Trusted TMR Processor and modules in other chassis is via either a Trusted

Interface module, such as the Trusted TMR Interface to a Regent+Plus I/O chassis, or an Expander Interface

to an Expander chassis.

The functions of the four types of module memory are:

• EPROM - Holds module bootstrap loader

• Flash ROM - Stores module firmware and the application program

• DRAM - Working memory with scaleable capacity

• NVRAM - Holds data such as event logs and retained program data

Technical Specifications