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Forum: FPGA, VHDL & Verilog vhdl arrays- index

Author: felix (Guest)

Posted on: 2017-01-09 12:42

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hi,

is there any predefined function in vhdl, that returns index of the bit 
that is set to '1' in a vector. thanks

Author: Markus F. (mfro)

Posted on: 2017-01-09 14:40

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for i in slv'reverse_range loop
    if (slv(i) == '1') then
        firstSet <= i;
        exit;
    end if;
end loop;

Author: Lothar M. (lkmiller) (Moderator)

Posted on: 2017-01-09 16:09

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felix wrote:
> that returns index of the bit that is set to '1' in a vector.
(How) can you be sure that only 1 bit is set in the vector?

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