![]() Syntax always (event) always …Procedures: Always and Initial Blocks All procedures in Verilog are specified within one of the following four Blocks. ![]() Statements inside an always block are executed sequentially. This is exactly what a flip flop's clock input is sensitive to.Verilog always block An always block is one of the procedural blocks in Verilog. This means that the block is only sensitive to the positive edge of the signal, in other words, a transition from a 0 to a 1. NoteThe sensitivity list for synchronous always blocks is very important. If the specified outputs are not matched with the output generated by half-adder, then errors will be displayed. ![]() Example #1 STestbench with 'always' block In Listing 9.3, 'always' statement is used in the testbench which includes the input values along with the corresponding output values. The same set of designs will be explored next using an always block. A few design examples were shown using an assign statement in a previous article. The verilog always block can be used for both sequential and combinational logic. ![]()
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