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CORBO VME Readout Control Board Contents State Diagram IDLE TRIG_INPUT Y Assert it Assert Busy Increment Event Counter Sart Busy_Watchdog IT_ACK N IT_ACK N ASSERT_IT Y CLEAR_BUSY Wait For Clear_Busy Or Watchdog WATCHDOG Fig 2 In the following sections, will be given a description of the different parts of this module: • VME interface and address mapping • Interrupt generator • Counters • Input selection • Differential bus • Front panel Input / Output • CSR description • Front panel display