testbench wait for event or some time

[Altera_Forum]

Dear All, 

could someone advice:  I want to wait in my testbench for a signal rise time, like this:  wait until rising_edge(MySignal)  however the rising edge must come within certain time, e.g. up to 100us. I've testested flavors of constructs like:  wait until rising_edge(MySignal) or now > 100 us;  however whatever I do, it does not react on the time condition. Only on the rising edge. What do I do wrong?  thanks d.

[Altera_Forum]

try:wait until rising_edge(MySignal) for 100 us;

[Altera_Forum]

ahmm, thanks, this combination did not come into my mind

[Altera_Forum]

you can never use NOW in a wait statement because it is not a signal so it will never produce an event so it waits forever.