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39 lines
1.2 KiB
VHDL
39 lines
1.2 KiB
VHDL
library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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library work;
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use work.glibc_random_helpers.all;
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package glibc_random is
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function pseudorand(a: integer) return std_ulogic_vector;
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function pseudorand1 return std_ulogic;
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end package glibc_random;
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package body glibc_random is
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function pseudorand(a: integer) return std_ulogic_vector is
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variable tmp1, tmp2, tmp3, tmp4: std_ulogic_vector(31 downto 0);
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variable ret: std_ulogic_vector(63 downto 0);
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begin
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tmp1 := std_ulogic_vector(to_unsigned(random, 32));
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tmp2 := std_ulogic_vector(to_unsigned(random, 32));
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if a <= 32 then
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ret := tmp1 & tmp2;
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else
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tmp3 := std_ulogic_vector(to_unsigned(random, 32));
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tmp4 := std_ulogic_vector(to_unsigned(random, 32));
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ret := tmp1(15 downto 0) & tmp2(15 downto 0) & tmp3(15 downto 0) & tmp4(15 downto 0);
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end if;
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return ret((a-1) downto 0);
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end;
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function pseudorand1 return std_ulogic is
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variable tmp: std_ulogic_vector(31 downto 0);
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begin
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tmp := std_ulogic_vector(to_unsigned(random, 32));
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return tmp(0);
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end;
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end package body glibc_random;
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