HP E1459A - Manual (Page 14)

Installing and Configuring the HP E1459A 13
The HP E1459A can be programmed to monitor channel occurrences either
internally with a 1.0 MHz sample clock, or externally, with a sourced
capture clock. Using either clocking technique, data channels may function
as edge detect inputs and/or data capture inputs.
Events at any channel may occur simultaneously or in overlap with events
on any other channel. Figure 1-2 is a block diagram of the hardware interrupt
resolver circuit. User software algorithms are also necessary to resolve
issues of overlap and to determine the occurring sequence of events.
Figure 1-2. Resolver Block Diagram
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