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[/] [System09/] [tags/] [LinuxPort/] [rtl/] [VHDL/] [bit_funcs.vhd] - Rev 215
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library IEEE; use IEEE.std_logic_1164.all; use IEEE.std_logic_arith.all; use IEEE.std_logic_unsigned.all; package bit_funcs is function log2(v: in natural) return natural; function pow2(v: in natural) return natural; end package bit_funcs; package body bit_funcs is function log2(v: in natural) return natural is variable i: natural; variable n: natural; variable logn: natural; begin n := 1; for i in 0 to 128 loop logn := i; exit when (n>=v); n := n * 2; end loop; return logn; end function log2; function pow2(v: in natural) return natural is variable i: natural; variable pown: natural; begin pown := 1; for i in 0 to v loop exit when (i=v); pown := pown * 2; end loop; return pown; end function pow2; end package body bit_funcs;
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