Use blocking or non blocking for streamline

         The description of pipeline adder in the book is like this ：“ Adopt assembly line , It can decompose an arithmetic operation into some small-scale basic operations , Put the carry and intermediate values Storage In the register , And in the next Clock cycle Inner continuation operation ”.
         The simulation result using blocking assignment is in a The clock Get results in the cycle , There is no hierarchical operation in each clock cycle as described , Nor does it reflect the characteristics of the assembly line ; Non blocking assignment seems to be more consistent “ Continue operation in the next clock cycle ” Description of , It also reflects the execution characteristics of the pipeline .