If my monitor samples some data and if ,based on some conditions i need some signal in the interface to be asserted, how can i do that?

Hi,
I have a passive agent, monitoring some frame data driven on a line, and once i have sampled the frame, i need to assert an interface signal.How ca/n i do this in a passive agent??

In reply to adharshh:

The scenario you are describing is not typical for a monitor. A better solution is to write a (concurrent) assertion, observing your data line and setting the corresponding signal.