testbench wait for event or some time

Question

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 · Answer

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

altera_forum · Answer

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

altera_forum · Answer

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.

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