The metastability in flip-flops can be averted by guaranteeing that the information and Management inputs are held valid and constant for specified durations in advance of and after the clock pulse, called the setup time (tsu) plus the keep time (th) respectively. The HD Rumble, explained by Yoshiaki Koizumi to https://shanehaqix.buyoutblog.com/14257613/the-fact-about-frosted-fraser-fir-christmas-tree-that-no-one-is-suggesting