Blocking and non-blocking assignments in Verilog
Explain blocking and non-blocking assignments in Verilog and which one is preferred in Sequential circuits?
Expert
A blocking assignment is one wherein the statements are sequentially executed, i.e. first statement is executed & variable is assigned a value then second is executed and so forth. A non blocking assignment is one wherein statements occur concurrently. Only non-blocking assignments must be employed in sequential circuit.
e.g
initial
begin
a=b; //blocking
c<=a; //nonblocking
d=c; //blocking
end
In this instance firstly the value of b is assigned to a & this value is assigned to c simply after execution of first statement. The second & the third statements are executed simultaneously, that means value a is assigned to c and previous value if c is assigned to d.
Normal 0 false false
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