What is the difference between `always @(posedge clk)` and `always_ff @(posedge clk)` in System Verilog?

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What is the difference between `always @(posedge clk)` and `always_ff @(posedge clk)` in System Verilog?

In System Verilog, the focus keyword difference between `always @(posedge clk)` and `always_ff @(posedge clk)` is in how they are used for sequential logic. The `always @(posedge clk)` construct is used for traditional flip-flops where the behavior is sensitive to a positive edge of the clock signal. On the other hand, the `always_ff @(posedge clk)` construct is specifically designed for sequential logic and is recommended for more predictable behavior, especially in complex designs where timing and synchronization issues may arise.

By using `always_ff @(posedge clk)`, designers can ensure that the code is more robust and reliable in handling clock edge transitions, reducing the chances of simulation mismatches and potential design bugs in the system.

It is crucial to understand the distinction between the two constructs to implement efficient and error-free sequential logic in System Verilog designs.

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