Events can be either synchronous or asynchronous to the system clock. Each event system channel has two subchannels; one asynchronous and one synchronous. Both subchannels are available to all event users, each user is hardwired to listen to one or the other.
The asynchronous subchannel is identical to the event output from the generator. If the event generator generates a signal that is asynchronous to the system clock, the signal on the asynchronous subchannel will be asynchronous. If the event generator generates a signal that is synchronous to the system clock, the signal on the asynchronous subchannel will also be synchronous.
The synchronous subchannel is identical to the event output from the generator if the event generator generates a signal that is synchronous to the system clock. If the event generator generates a signal that is asynchronous to the system clock, this signal is first synchronized before being routed onto the synchronous subchannel. Synchronization will delay the event by two system cycles. The event system automatically performs this synchronization if an asynchronous generator is selected for an event channel, no explicit configuration is needed.