---------------------------------------------------------------------
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---------------------------------------------------------------------
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-- Common package for LXP32 testbenches
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-- Common package for LXP32 testbenches
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--
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--
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-- Part of the LXP32 verification environment
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-- Part of the LXP32 verification environment
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--
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--
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-- Copyright (c) 2016 by Alex I. Kuznetsov
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-- Copyright (c) 2016 by Alex I. Kuznetsov
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---------------------------------------------------------------------
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---------------------------------------------------------------------
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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use ieee.math_real.all;
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use ieee.math_real.all;
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package body common_pkg is
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package body common_pkg is
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procedure rand(variable st: inout rng_state_type; a,b: integer; variable x: out integer) is
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procedure rand(variable st: inout rng_state_type; a,b: integer; variable x: out integer) is
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variable r: real;
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variable r: real;
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begin
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begin
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assert a<=b report "Invalid range" severity failure;
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assert a<=b report "Invalid range" severity failure;
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uniform(st.seed1,st.seed2,r);
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uniform(st.seed1,st.seed2,r);
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r:=r*real(b-a+1);
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r:=r*real(b-a+1);
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x:=a+integer(floor(r));
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x:=a+integer(floor(r));
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end procedure;
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end procedure;
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function hex_string(x: std_logic_vector) return string is
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function hex_string(x: std_logic_vector) return string is
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variable xx: std_logic_vector(x'length-1 downto 0);
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variable xx: std_logic_vector(x'length-1 downto 0);
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variable i: integer:=0;
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variable i: integer:=0;
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variable ii: integer;
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variable ii: integer;
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variable c: integer;
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variable c: integer;
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variable high_index: integer;
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variable s: string(x'length downto 1);
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variable s: string(x'length downto 1);
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begin
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begin
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xx:=x;
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xx:=x;
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loop
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loop
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ii:=i*4;
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ii:=i*4;
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exit when ii>xx'high;
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exit when ii>xx'high;
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if ii+3<=xx'high then
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if ii+3<=xx'high then
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c:=to_integer(unsigned(xx(ii+3 downto ii)));
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high_index:=ii+3;
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else
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else
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c:=to_integer(unsigned(xx(xx'high downto ii)));
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high_index:=xx'high;
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end if;
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if is_x(xx(high_index downto ii)) then
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c:=-1;
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else
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c:=to_integer(unsigned(xx(high_index downto ii)));
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end if;
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end if;
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case c is
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case c is
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when 0 => s(i+1):='0';
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when 0 => s(i+1):='0';
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when 1 => s(i+1):='1';
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when 1 => s(i+1):='1';
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when 2 => s(i+1):='2';
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when 2 => s(i+1):='2';
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when 3 => s(i+1):='3';
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when 3 => s(i+1):='3';
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when 4 => s(i+1):='4';
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when 4 => s(i+1):='4';
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when 5 => s(i+1):='5';
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when 5 => s(i+1):='5';
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when 6 => s(i+1):='6';
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when 6 => s(i+1):='6';
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when 7 => s(i+1):='7';
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when 7 => s(i+1):='7';
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when 8 => s(i+1):='8';
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when 8 => s(i+1):='8';
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when 9 => s(i+1):='9';
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when 9 => s(i+1):='9';
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when 10 => s(i+1):='A';
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when 10 => s(i+1):='A';
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when 11 => s(i+1):='B';
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when 11 => s(i+1):='B';
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when 12 => s(i+1):='C';
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when 12 => s(i+1):='C';
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when 13 => s(i+1):='D';
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when 13 => s(i+1):='D';
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when 14 => s(i+1):='E';
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when 14 => s(i+1):='E';
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when 15 => s(i+1):='F';
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when 15 => s(i+1):='F';
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when others => s(i+1):='X';
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when others => s(i+1):='X';
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end case;
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end case;
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i:=i+1;
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i:=i+1;
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end loop;
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end loop;
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return s(i downto 1);
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return s(i downto 1);
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end function;
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end function;
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end package body;
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end package body;
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