Add possibility to use falling clock edge as the active one.

[KrzysztofZyla]

(This was discussed some time ago, via email)
Now only rising clock edge can be the active edge. In TbUtilPkg.vhd we have

constant CLK_ACTIVE : std_logic := '1' ;

And this value is used in procedures like WaitForTransaction, WaitForClock, CreateReset and others.
If subprograms using CLK_ACTIVE had this value passed as a parameter (CLK_ACTIVE as the default value) it would be possible to also use the falling clock edge as active.

[JimLewis]

Are you thinking then pass it as an optional parameter? That might make sense for a number of them. I put the constant CLK_ACTIVE in there to remind me to think about how to make it more generic. For WaitForClock, maybe there should also be a WaitForRisingClock and WaitForFallingClock?

[KrzysztofZyla]

Are you thinking then pass it as an optional parameter?

Yes. It would give the user an alternative to use them in that way without modifying OSVVM library sources.

maybe there should also be a WaitForRisingClock and WaitForFallingClock?

Didn't thought about it, but for sure WaitForRisingClock and WaitForFallingClock is self-explanatory and more intuitive.