signaltap question trigger

I do not have a signal which tells me that the system is hung. It happens on the software side on the host. I want to capture the signals when the host tells me it has hung because after that there is not going to be a change on signals so I can see the state. So I need to tap them out on the computer screen in the analyzer at that time .Is there any manual way of telling the analyzer when to display the signals and not at every point of the trigger.

During the correct transaction it can store the values internally which are then overwritten by the next cycle till there is a problem. When the problem occurs there will not be any more triggers and then I can tap the stored values out on the analyzer to view them. Is there some mechanism for such a process in signaltap?