Delayed wake up and Quick Rise are the same command?

I’m kind of confused, can someone please explain when a quick rise would come out or when delayed wake up will come out. I know it has something to do with a hard knockdown, but I’m not really sure what makes a hard knockdown besides a sweep.

If you can’t quick stand, you can delay wake-up instead. Sweeps, throws, supers, ultras, and some other specific moves cause hard knockdown.

Quick rise doesn’t work for hard/untechable knockdowns. For those, you use DWU instead.