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Why do we code FF using NBA w.r.t Stratified event queue

hipooja

Hello,

 

i was looking at the Verilog/Sysverilog stratified event queue and had a question as to why FF are coded using NBA?

I came up with an answer myself ,just wanted to cross check whether i hit / missed the bull's eye ...

FF are basically memory elements and hence must store value

They sample the previous ,stable outputs -The current output depends on the previous input owing to the feedback mechanism in sequential circuits.

NBA are evaluated at the beginning of the time step and the lhs is assigned at the end of the time step ,hence the previous and stable value is assigned to the LHS which helps in modeling a FF.Incase of blocking assignments ,the current value is sampled and assigned immediately which does not help in modeling FF's

 

Let me know your inputs

 

Regards,

Pooja

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