Verilog code for decoder
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This document contains two Verilog code modules for a 3x8 decoder. The first module uses assign statements to decode the inputs a, b, and c into the 8-bit output z. The second module uses not, and gates to decode the inputs into the output in an alternative coding style. Both modules take in the 3-bit input and output the 8-bit decoded value.
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![Verilog code for 3*8 decoder
module decoder(a,b,c, z);
input a,b,c;
output [7:0] z;
wire abar, bbar,cbar ;
assign abar =~ a;
assign bbar =~ b;
assign cbar =~ c;
assign z[0] = abar & bbar & cbar ;
assign z[1] = abar & bbar & c ;
assign z[2] = abar & b & cbar ;
assign z[3] = abar & b & c ;
assign z[4] = a & bbar & cbar ;
assign z[5] = a & bbar & c ;
assign z[6] = a & b & cbar ;
assign z[7] = a & b & c ;
endmodule](https://image.slidesharecdn.com/verilog-code-for-decoder-160215041405/85/Verilog-code-for-decoder-1-320.jpg)
![Verilog code for 3*8 decoder( alternate style of coding)
module decoder(a,b,c, z);
input a,b,c;
output [7:0] z;
wire abar, bbar,cbar ;
not inv1 ( abar, a);
not inv2 ( bbar, b);
not inv3 ( cbar, c);
and a0 ( z[0],abar,bbar,cbar);
and a1 ( z[1],abar,bbar,c);
and a2 ( z[2],abar,b,cbar);
and a3 ( z[3],abar,b,c);
and a4 ( z[4],a,bbar,cbar);
and a5 ( z[5],a,bbar,c);
and a6 ( z[6],a,b,cbar);
and a7 ( z[7],a,b,c);
endmodule](https://image.slidesharecdn.com/verilog-code-for-decoder-160215041405/85/Verilog-code-for-decoder-2-320.jpg)
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- 1. Verilog code for 3*8 decoder module decoder(a,b,c, z); input a,b,c; output [7:0] z; wire abar, bbar,cbar ; assign abar =~ a; assign bbar =~ b; assign cbar =~ c; assign z[0] = abar & bbar & cbar ; assign z[1] = abar & bbar & c ; assign z[2] = abar & b & cbar ; assign z[3] = abar & b & c ; assign z[4] = a & bbar & cbar ; assign z[5] = a & bbar & c ; assign z[6] = a & b & cbar ; assign z[7] = a & b & c ; endmodule
- 2. Verilog code for 3*8 decoder( alternate style of coding) module decoder(a,b,c, z); input a,b,c; output [7:0] z; wire abar, bbar,cbar ; not inv1 ( abar, a); not inv2 ( bbar, b); not inv3 ( cbar, c); and a0 ( z[0],abar,bbar,cbar); and a1 ( z[1],abar,bbar,c); and a2 ( z[2],abar,b,cbar); and a3 ( z[3],abar,b,c); and a4 ( z[4],a,bbar,cbar); and a5 ( z[5],a,bbar,c); and a6 ( z[6],a,b,cbar); and a7 ( z[7],a,b,c); endmodule