Using Enable in Synchronous circuits
In order to maintain the benefits of a synchronous system (avoiding clock glitches), it is important that
the clock to all of the components be the same (uninterrupted). Here is what NOT TO DO:
Instead, if you need to enable a flip-flop, use one with enable capability designed in or use the MUX
as shown:Flip-flops with enable allows the designers to focus on the input/output synchronization. Enabled flip-
flops simply require a connection to the enable pin, similar to the Clear and Preset signals.1D
D
EN
ClK