特别简单的一个例子，用来练手。
以下为源代码：
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//--------------myfunction----------
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modulemyfunction(clk,n,result,reset,sl);
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output[6:0]result;
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input[2:0] n;
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input reset,clk;
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input [1:0] sl;
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reg[6:0]result;//define input and output
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always @(posedgeclk)
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begin
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if(!reset)
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result<=0;
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else
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begin
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case(sl)
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2'd0:result<=square(n);
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2'd1:result<=cubic(n);
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2'd2:result<=factorial(n);
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endcase
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end
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end
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function[6:0]square;
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input [2:0]operand;
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begin
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square=operand*operand;
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end
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endfunction
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function[6:0]cubic;
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input [2:0]operand;
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begin
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cubic=operand*operand*operand;
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end
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endfunction
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function[6:0]factorial;
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input [2:0]operand;
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reg [2:0] index;
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begin
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factorial = 1 ;
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for(index = 2; index <= operand; index =index + 1)
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factorial = index * factorial;
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end
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endfunction
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endmodule
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//--------------testmyfunc----------
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`include"./myfunction.v"
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`timescale1ns/100ps
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`define clk_cycle50
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module testmyfunc;
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reg[2:0] n;
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reg reset,clk;
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reg[1:0] sl;
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wire[6:0] result;
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parametertimes=20;
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initial
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begin
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n=0;
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reset=1;
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clk=0;
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sl=0;
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#100 reset=0;
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#100 reset=1;
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repeat(times)
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begin
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#50sl={$random}%3;
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#50 n={$random}%6;
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end
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#1000 $stop;
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end
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always #`clk_cycleclk=~clk;
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myfunctionmyfunct(.clk(clk),.n(n),.result(result),.reset(reset),.sl(sl));
- endmodule
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