• Handles up to four event interrupt signals
• Trigger and clear inputs : NIM, TTL or differential
• Busy output: NIM, TTL or differential signal
• Slow clock frequency: 10 KHz
• Slow clock output level: NIM or TTL
• Four 32-bit fully programmable event number counters
• Four 16-bit fully programmable dead time measurement counters

We often face the problem of trigger distribution and readout dead time control in data acquisition systems based on VME bus architecture, with either one or more processors scattered in different crates. The RCB 8047 has been specially designed to meet those requirements.

The RCB 8047 houses four identical and independent channels. Each contains a trigger input, a busy output, two VME interrupt generators and two counters.

The main use of the module is in the following scenario:

A trigger generates a busy signal and a VME interrupt. The event counter is incremented by one and the dead time counter starts counting the slow clock signal (100 µs period). The busy signal will remain active until it is cleared by a VME access, preventing acceptance of other triggers. The dead time counter gives a measurement of the busy active time. If the busy remains active too long, a VME interrupt is sent.

The trigger input may be the front panel input, the front panel differential bus input, the front panel push button, or the signal generated by a software access to a VME register. The event counter may count either the busy signal, or the trigger input.

The counters may be read and written through VME. The dead time counter may also be used as a time-out generator.

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