TRICONEX 3805H Displacement drive module

The redundant transmissions statistically lowers the probability of data corruption. The probability of data transmission failure of both transmissions is once every three thousand years. Redundant transmissions guarantee that all data will arrive across the link correctly. A fiber-optic transfer error is a rare event and the board which has the receive error has the capability to notify the local VME chassis that it has occurred. In most systems it should be preferable to operate in single transmission mode to maintain high data throughput. In the case a retransmission request is too slow, the double transmission mode is available.Not all nodes have to be configured with the same memory size. Nodes may be configured to make optimum use of memory.

BUS INTERRUPTER MODULE (BIM) 

To facilitate handling of interrupts, an MC68153 is used on the board. The attention interrupts (INT1, INT2, and INT3) are used to signal an interrupt from a remote chassis. An interrupt (INT0) may be generated when the transmit FIFO on the node being written to by the VMEbus becomes over half full. The transmit FIFO over half full condition occurs when the local node has received data from the local VME chassis but has not been granted permission to transmit its data on the link. All interrupts are masked off at power-up and become enabled under program control.

NODE LATENCY 

If the fiber-optic data bandwidth has not been exceeded, data latency is typically 1.5 µs/node in single transfer mode. Longer latencies will result if data input rates exceed 6.2 Mbytes/sec for a period of time. The transmit FIFOs will back up with data until the half-full interrupts are set off or a bus error occurs in the event the FIFOs become full.

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