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One hot encoding with combo logic

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cnivaz

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how to check one hot encoding

Hello,
How to check the data , whether it is one hotted or not, with combo logic. Assume that the data bus width is 32 bit. I tried to implement in sequential logic , it consumed 32 clock cycles to find the result.


Thanks and Regards
Nivaz
 

Re: One hot encoding

Hi,

here is the code to decode one hot encoding :

module test(din,onehot_out);

input [31:0] din;
output onehot_out;

reg onehot_out;

function integer decode_onehot
input [31:0] data;
integer i,bits;
begin
decode_onehot = -1;
bits = 0;
for(i=0;i<=31;i=i+1)
if(data) begin
decode_onehot = i;
bits = bits + 1;
end
if(bits != 1)
$display("Error : data is not one hot encoded");
end
endfunction

always@(din)
begin
if(decode_onehot(din) > -1)
onehot_out = 1'b1;
else
onehot_out = 1'b0;
end

endmodule

Let me know if it doesnt work...

Regards,
dcreddy
 

Re: One hot encoding

cnivaz said:
Hello,
How to check the data , whether it is one hotted or not, with combo logic. Assume that the data bus width is 32 bit. I tried to implement in sequential logic , it consumed 32 clock cycles to find the result.


Thanks and Regards
Nivaz
Click to expand...

If you use SVA or PSL, it is very simple:

Code: 
  a1_one_hot : assert ($onehot(my_vec)) else $error ("my_vec is NOT one hot! %0b ", my_vec)

HTH
Ajeetha, CVC
www.noveldv.com
 

Re: One hot encoding

Hi,
can u pls give me description for " one hot encoding meaning"

Thanks
MRK
 

One hot encoding

hey
"one hot encoding" means that you provide separate output f/f for each state. This means at one time only one will be active.
Let sat you are designing a 3 bit counter.Normally the output will be of two bits(with one don't care) but with "one hot encoding" output will be three bits wide each bit will be on for a different state.

Regards
tronix
 

Re: One hot encoding

Hi,

Can One-Hot encoding makes Data Path Short.

If yes How.
 

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