Decline Acceptor Countersign with airSlate SignNow

Decline countersign corroborator

now that we've learned how to define multi-cycle properties you can imagine circumstances under which you want to cancel evaluation so for example if you have a bus transfer underway and then the reset occurs you're no longer expecting that bus transfer to complete successfully because you've just reset it so therefore we need a way of communicating this to the tool so what we can do is use this disable iff clause that we've seen before now one thing to be aware of with this is that it's completely asynchronous inside of these brackets here which are mandatory we put some expression which is evaluated to a boolean true or false any expression we wish and any cycle under which that boolean expression becomes true then the whole concurrent assertion gets cancelled so it's not required to pass anymore so the behavior is asynchronous so if we want asynchronous behavior this is what we use as you can imagine it would be painful having to write disable iff if you always have the same condition which you disabled so just as with default clocks that we've seen before you can have a disable which is a default and we do this using the keyword trio default disable and iff and then we put the expression in parentheses so just like the default clock this only applies to the scope that it's within it doesn't apply to the whole design at all so if i had that default disable rstn this property is still going to be disabled by the clr1 signal however if we deleted this the default disable is now being used for this property because it does not have an explicit one so i'll just put the explicit disable back for the time being so let's take a look at how this behaves when we run this in the cadence simulator excellium so notice we're sampling at the pos edge clock so we're sampling a true there and you can see this transaction showing the we've started evaluation of this assertion but at this point here that signal cl r1 is true so notice although the property says our pos edge clock the disable iff has nothing to do with the clock at all any cycle at which cl r1 is high namely we're because of that right now the evaluation of the entire concurrent assertion is disabled so although we had a b c d that didn't count as a pass for these other occurrences of abcd notice because we haven't had clr what one being the value one these end up being finished i.e they passed so where this may be particularly problematic in simulation is if this glitch on clr1 occurs during some delta cycle i it goes to one then back to zero at the same simulation time that will still cancel the entire concurrent assertion until the next time a occurs at a pos edge clock again so the question is what...