suresh Understanding the Difference between always and always_comb Blocks in SystemVerilog
When it comes to SystemVerilog programming, it is crucial to differentiate between the always and always_comb blocks, as they serve different purposes and have distinct behaviors.
always Block:
In SystemVerilog, the always block is used to describe concurrent processes that execute continuously whenever the sensitive list triggers. It is sensitive to a set of events or conditions, such as signal changes, and reacts accordingly. The always block is used for describing sequential logic, state machines, and combinatorial logic, among others.
always_comb Block:
On the other hand, the always_comb block is specifically used for describing combinational logic. This block executes whenever any of the signals in its sensitivity list change, without any regard for the order of events. It is suitable for modeling purely combinational logic without any storage elements.
Therefore, the main difference between the always and always_comb blocks in SystemVerilog lies in their intended use cases and behavior. While the always block is versatile and can describe sequential and combinational logic, the always_comb block is dedicated to describing pure combinational logic.
Understanding how and when to use each block is essential for writing efficient and effective SystemVerilog code.
Please login or Register to submit your answer