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Altera_Forum's avatar
Altera_Forum
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15 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
Icon for Honored Contributor rankHonored Contributor
15 years ago

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I didn't yet proceed to Quartus 10. I compiled under V9.0 with VHDL 1993 settings and got the below error with your recent code. I was under the assumption, that constant slice ranges are required, no idea which other setting may be different. But the point isn't very important.

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This is a "bug" thats been around a while, and have mentioned on our internal wiki. Apparently only Quartus has had a problem with it, no concerns with ISE or Modelsim.

Maybe they finally fixed it with Q10!