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------------------------------------------------
-- Test intent : collection of useful functions and procs
-- Test scope : Basic File write of type character
-- Keywords : [function, procedure]
--! References [VH1993 3.4: ]
--! [VH2019 5.5: ]
-------------------------------------------------
--
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package subs_pkg is
-- procedures
procedure msg(str : in string); -- output a system message string.
-- functions
function bv2str(bv: bit_vector) return string; -- convert bit_vector to string
function slv2str(slv: std_logic_vector) return string; -- convert std_logic_vector to string
function sulv2str(sulv: std_ulogic_vector) return string; -- convert std_ulogic_vector to string
function klsfr(bv: bit_vector) return bit_vector; -- do LSFR on bit_vector 8, 16 32
function klsfr(bv: std_logic_vector) return std_logic_vector; -- do LSFR on bit_vector 8, 16 32
end;
package body subs_pkg is
-- simple message output.
procedure msg(str : in string) is
begin
report "System Message: " & str;
end procedure;
-- take in bit_vector return string.
function bv2str(bv: bit_vector) return string is
variable st_out : string(1 to bv'length);
alias v : bit_vector(1 to bv'length) is bv;
begin
for i in v'range loop
if(v(i) = '0') then
st_out(i) := '0';
else
st_out(i) := '1';
end if;
end loop;
return st_out;
end function;
-- take in std_logic_vector return string.
function slv2str(slv: std_logic_vector) return string is
variable st_out : string(1 to slv'length);
alias v : std_logic_vector(1 to slv'length) is slv;
begin
for i in v'range loop
case v(i) is
when 'U' =>
st_out(i) := 'U';
when 'X' =>
st_out(i) := 'X';
when '0' =>
st_out(i) := '0';
when '1' =>
st_out(i) := '1';
when 'Z' =>
st_out(i) := 'Z';
when 'W' =>
st_out(i) := 'W';
when 'L' =>
st_out(i) := 'L';
when 'H' =>
st_out(i) := 'H';
when '-' =>
st_out(i) := '-';
when others =>
assert false report "STD_LOGIC_VALUE not in value set." severity failure;
end case;
end loop;
return st_out;
end function;
-- to
function sulv2str(sulv: std_ulogic_vector) return string is
variable st_out : string(1 to sulv'length);
alias v : std_ulogic_vector(1 to sulv'length) is sulv;
begin
for i in v'range loop
case v(i) is
when 'U' =>
st_out(i) := 'U';
when 'X' =>
st_out(i) := 'X';
when '0' =>
st_out(i) := '0';
when '1' =>
st_out(i) := '1';
when 'Z' =>
st_out(i) := 'Z';
when 'W' =>
st_out(i) := 'W';
when 'L' =>
st_out(i) := 'L';
when 'H' =>
st_out(i) := 'H';
when '-' =>
st_out(i) := '-';
when others =>
assert false report "STD_ULOGIC_VALUE not in value set." severity failure;
end case;
end loop;
return st_out;
--return slv2str(std_logic_vector(to_unsigned(sulv)));
end function;
-- bitvector lsfr
function klsfr(bv: bit_vector) return bit_vector is
alias v : bit_vector(bv'high downto 0) is bv;
variable rtn : bit_vector(bv'high downto 0);
variable len : integer := bv'length;
begin
case len is
when 8 =>
rtn := v(6 downto 0) & ((v(7) xor v(4)) xor (v(1) xor v(2)));
when 16 =>
rtn := v(14 downto 0) & ((v(15) xor v(14)) xor (v(12) xor v(3)));
when 32 =>
rtn := v(30 downto 0) & ((v(31) xor v(6)) xor (v(5) xor v(1)));
when others =>
report "ERROR: LSFR size not implemented ..." severity failure;
end case;
return rtn;
end function;
function klsfr(bv: std_logic_vector) return std_logic_vector is
alias v : std_logic_vector(bv'high downto 0) is bv;
variable rtn : std_logic_vector(bv'high downto 0);
variable len : integer := bv'length;
begin
for i in bv'range loop
if (bv(i) /= '1' and
bv(i) /= '0') then
report "klsfr got a none logic value passed ..." severity failure;
end if;
end loop;
case len is
when 8 =>
rtn := v(6 downto 0) & ((v(7) xor v(4)) xor (v(1) xor v(2)));
when 16 =>
rtn := v(14 downto 0) & ((v(15) xor v(14)) xor (v(12) xor v(3)));
when 32 =>
rtn := v(30 downto 0) & ((v(31) xor v(6)) xor (v(5) xor v(1)));
when others =>
report "ERROR: LSFR size not implemented ..." severity failure;
end case;
return rtn;
end function;
end package body;
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