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Engineering 100 Section 250 Combinational Logic -- Examples 9/13/2010
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Truth table ABCOut 000 001 010 011 100 101 110 111
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Truth table ABCOut 000 001 010 011 100 101 110 111
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NOT module NOT( input wire A, output reg B); always @* begin if (A == 1'b0) begin B = 1'b1; end else begin B = 1'b0; end endmodule
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module RR_raise10( input wire OSU, input wire Bowl, output reg raise1, output reg raise0); always @* begin raise1 = 1'b0; raise0 = 1'b0; if (OSU == 1'b0 && Bowl == 1'b1) begin raise1 = 1'b0; raise0 = 1'b1; end else if (OSU == 1'b1 && Bowl == 1'b0) begin raise1 = 1'b0; raise0 = 1'b1; end else if (OSU == 1'b1 && Bowl == 1'b1) begin raise1 = 1'b1; raise0 = 1'b1; end endmodule
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module add( input wire [1:0] A, input wire [1:0] B, output reg [2:0] C); always @* begin C[2:0] = A[1:0] + B[1:0]; end endmodule Add
![module add( input wire [1:0] A, input wire [1:0] B, output reg [2:0] C); begin C[2:0] = A[1:0] + B[1:0]; end endmodule Add](http://images.slideplayer.com/20/6005766/slides/slide_6.jpg "module add( input wire [1:0] A, input wire [1:0] B, output reg [2:0] C); begin C[2:0] = A[1:0] + B[1:0]; end endmodule Add")
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Bad Add module add( input wire [1:0] A, input wire [1:0] B, output reg [1:0] C); always @* begin if ( A == 2'b00 && B == 2'b00) begin C = 3'b000; end else if ( A == 2'b00 && B == 2'b01) begin C = 3'b001;... end else if ( A == 2'b11 && B == 2'b10) begin C = 3'b101; end else begin C = 3'b110; end endmodule
![Bad Add module add( input wire [1:0] A, input wire [1:0] B, output reg [1:0] C); begin if ( A == 2 b00 && B == 2 b00) begin C = 3 b000; end else if ( A == 2 b00 && B == 2 b01) begin C = 3 b001;...](http://images.slideplayer.com/20/6005766/slides/slide_7.jpg "end else if ( A == 2 b11 && B == 2 b10) begin C = 3 b101; end else begin C = 3 b110; end endmodule.")
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Truth table ABC 000 001 010 011 100 101 110 111
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