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Altera_Forum's avatar
Altera_Forum
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14 years ago

Counting the position of ones in a binary vector

I want to design a combinatorial circuit for an fpga which will count the position of ones in a 16 bit vector. eg1 if vector is 16'b0000_0000_0011_0101 then output should be 64'h0000_0000_0000_5...
Altera_Forum's avatar
Altera_Forum
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14 years ago

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the loop index is going up anyway. for bit index 3 then output nibble = 3 if it is '1' else nibble = 0

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e.g. for bit 3, i == 3 and you will fill in nibble 3, but if this was the first bit (set to '1') encountered nibble 0 should get value 3. I don't think your code is doing that.

Anyway I compiled my proposition, and it is actually not too bad, The compiler generated 477 LCs for a Cyclone II device. I still (would/will) have to simulate it.