Functional architecture

Figme 3.8 describes the functional architecture of the CSD. The memory copies are depicted by the bold double arrows, and the internal data transit by the double arrows. 

The CSD is a cyclical and synchronous computer. The temporal characteristics (cycle time, frequency of self-tests) are adjusted by the user and performed by software interrupt mechanisms 

At initialization, the CAP (VME bus master) transmits these characteristics (cycle time and frequency of self-tests) to the voter in its basket. 

The voter plays the role of the eonductof the starting voter signals the begiiuiing of the eycle by a sign of life (SoL) interrupt message. 

The voter of chaimel A starts off the initialization aibitrarily. In case of a breakdown of the first voter, the second voter takes up the relay automatically. 

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