How to become a senior digital IC Design Engineer (1-2) Verilog coding syntax: Verilog 1995, 2001, 2005 standards

One 、Verilog 1995

         This is the first Verilog standard , It is not recommended at present .

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Two 、Verilog 2001

         This is upgraded Verilog standard , At present, it is the most recommended .

         stay Verilog-2001 in , comparison Verilog-1995, Many effective features have been added , It can improve the quality of design 、 It can improve the comprehensive ability 、 It can improve the efficiency of verification and so on , The changes are as follows ：

        1、 increase generate sentence , Simplify multiple instantiations of modules , To achieve a more streamlined writing .

        2、 enhance [7:0] mem [255:0]  Multidimensional arrays Support for .

        3、 Enhancement file I/O The operation of .

        4、 increase  task and function Reentry support .

        5、 increase always @(*) sentence .

        6、 increase Part-Select（+: && -:） How to write it .

        7、 increase localparam Definition .

        8、 Add a new Port declaration method .

        9、 Support constant functions .

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