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If I understood the question (4 to 16 decoder) then MSchmitt's coding is how I would implement this as well. If you don't want the decoder registered then you would write it like this:
reg [15:0] Out_P;
always @ (In_N)
begin
case (In_N)
4'd0 : Out_P = 16'd1;
4'd1 : Out_P = 16'd2;
4'd2 : Out_P = 16'd4;
4'd3 : Out_P = 16'd8;
4'd4 : Out_P = 16'd16;
4'd5 : Out_P = 16'd32;
4'd6 : Out_P = 16'd64;
4'd7 : Out_P = 16'd128;
4'd8 : Out_P = 16'd256;
4'd9 : Out_P = 16'd512;
4'd10 : Out_P = 16'd1024;
4'd11 : Out_P = 16'd2048;
4'd12 : Out_P = 16'd4096;
4'd13 : Out_P = 16'd8192;
4'd14 : Out_P = 16'd16384;
4'd15 : Out_P = 16'd32768;
endcase
end
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this is also a ROM
can it describe wtih register?
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