Asynchronous & Synchronous Reset Design Techniques - …
Each Verilog procedural block or VHDL process should model only one type of flip-flop. In other words, a designer should not mix resetable flip-flops with follower flip-flops (flops with no resets) in the same procedural block or process[14]. Follower flip-flops are flip-flops that are simple data shift registers.
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