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conversions.vhd
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--------------------------------------------------------------------------------
-- File Name: conversions_p.vhd
--------------------------------------------------------------------------------
-- Copyright (C) 1997, 1998, 2001 Free Model Foundry; http://eda.org/fmf/
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License version 2 as
-- published by the Free Software Foundation.
--
-- This package was written by SEVA Technologies, Inc. and donated to the FMF.
-- www.seva.com
--
-- MODIFICATION HISTORY:
--
-- version: | author: | mod date: | changes made:
-- V1.0 R. Steele 97 DEC 05 Added header and formatting to SEVA file
-- V1.1 R. Munden 98 NOV 28 Corrected some comments
-- Corrected function b
-- V1.2 R. Munden 01 MAY 27 Corrected function to_nat for weak values
-- and combined into a single file
--
--------------------------------------------------------------------------------
LIBRARY IEEE; USE IEEE.std_logic_1164.ALL;
--------------------------------------------------------------------------------
-- CONVERSION FUNCTION SELECTION TABLES
--------------------------------------------------------------------------------
--
-- FROM TO: std_logic_vector std_logic natural time string
-- -----------------|---------------|---------|---------|---------|-----------
-- std_logic_vector | N/A | N/A | to_nat | combine | see below
-- std_logic | N/A | N/A | to_nat | combine | see below
-- natural | to_slv | to_sl | N/A | to_time | see below
-- time | N/A | N/A | to_nat | N/A | to_time_str
-- hex string | h | N/A | h | combine | N/A
-- decimal string | d | N/A | d | combine | N/A
-- octal string | o | N/A | o | combine | N/A
-- binary string | b | N/A | b | combine | N/A
-- -----------------|---------------|---------|---------|---------|-----------
--
-- FROM TO: hex string decimal string octal string binary string
-- -----------------|------------|-------------|------------|----------------
-- std_logic_vector | to_hex_str | to_int_str | to_oct_str | to_bin_str
-- std_logic | N/A | N/A | N/A | to_bin_str
-- natural | to_hex_str | to_int_str | to_oct_str | to_bin_str
-- -----------------|------------|-------------|------------|----------------
--
--------------------------------------------------------------------------------
PACKAGE conversions IS
----------------------------------------------------------------------------
-- the conversions in this package are not guaranteed to be synthesizable.
--
-- others functions available
-- fill creates a variable length string of the fill character
--
--
--
-- input parameters of type natural or integer can be in the form:
-- normal -> 8, 99, 4_237
-- base#value# -> 2#0101#, 16#fa4C#, 8#6_734#
-- with exponents(x10) -> 8e4, 16#2e#E4
--
-- input parameters of type string can be in the form:
-- "99", "4_237", "0101", "1010_1010"
--
-- for bit/bit_vector <-> std_logic/std_logic_vector conversions use
-- package std_logic_1164
-- to_bit(std_logic)
-- to_bitvector(std_logic_vector)
-- to_stdlogic(bit)
-- to_stdlogicvector(bit_vector)
--
-- for "synthesizable" signed/unsigned/std_logic_vector/integer
-- conversions use
-- package std_logic_arith
-- conv_integer(signed/unsigned)
-- conv_unsigned(integer/signed,size)
-- conv_signed(integer/unsigned,size)
-- conv_std_logic_vector(integer/signed/unsigned,size)
--
-- for "synthesizable" std_logic_vector -> integer conversions use
-- package std_logic_unsigned/std_logic_signed
-- <these packages are mutually exclusive>
-- conv_integer(std_logic_vector)
-- <except for this conversion, these packages are unnecessary)
-- to minimize compile problems write:
-- use std_logic_unsigned.conv_integer;
-- use std_logic_signed.conv_integer;
--
-- std_logic_vector, signed and unsigned types are "closely related"
-- no type conversion functions are needed, use type casting or qualified
-- expressions
--
-- type1(object of type2) <type casting>
-- type1'(expression of type2) <qualified expression>
--
-- most conversions have 4 parmeters:
-- x : value to be converted
-- rtn_len : size of the return value
-- justify : justify value 'left' or 'right', default is right
-- basespec : print the base of the value - 'yes'/'no', default is yes
--
-- Typical ways to call these functions:
-- simple, all defaults used
-- to_bin_str(x)
-- x will be converted to a string of minimum size with a
-- base specification appended for clarity
-- if x is 10101 then return is b"10101"
--
-- to control size of return string
-- to_hex_str(x,
-- 6)
-- length of string returned will be 6 characters
-- value will be right justified in the field
-- if x is 10101 then return is ....h"15"
-- where '.' represents a blank
-- if 'rtn_len' parm defaults or is set to 0 then
-- return string will always be minimum size
--
-- to left justify and suppress base specification
-- to_int_str(x,
-- 6,
-- justify => left,
-- basespec => yes)
-- length of return string will be 6 characters
-- the base specification will be suppressed
-- if x is 10101 then return is 21....
-- where '.' represents a blank
--
-- other usage notes
--
-- if rtn_len less than or equal to x'length then ignore
-- rtn_len and return string of x'length
-- the 'justify' parm is effectively ignored in this case
--
-- if rtn_len greater than x'length then return string
-- of rtn_len with blanks based on 'justify' parm
--
-- these routines do not handle negative numbers
----------------------------------------------------------------------------
type justify_side is (left, right);
type b_spec is (no , yes);
-- std_logic_vector to binary string
function to_bin_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- std_logic to binary string
function to_bin_str(x : std_logic;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- natural to binary string
function to_bin_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- see note above regarding possible formats for x
-- std_logic_vector to hex string
function to_hex_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- natural to hex string
function to_hex_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- see note above regarding possible formats for x
-- std_logic_vector to octal string
function to_oct_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- natural to octal string
function to_oct_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- see note above regarding possible formats for x
-- natural to integer string
function to_int_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- see note above regarding possible formats for x
-- std_logic_vector to integer string
function to_int_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string;
-- time to string
function to_time_str (x : time)
return string;
-- add characters to a string
function fill (fill_char : character := '*';
rtn_len : integer := 1)
return string;
-- usage:
-- fill
-- returns *
-- fill(' ',10)
-- returns .......... when '.' represents a blank
-- fill(lf) or fill(ht)
-- returns line feed character or tab character respectively
-- std_logic_vector to natural
function to_nat (x : std_logic_vector)
return natural;
-- std_logic to natural
function to_nat (x : std_logic)
return natural;
-- time to natural
function to_nat (x : time)
return natural;
-- hex string to std_logic_vector
function h (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector;
-- if rtn_len is < than x'length*4, result will be truncated on the left
-- if x is other than characters 0 to 9 or a,A to f,F
-- or x,X,z,Z,u,U,-,w,W, result will be 0
-- decimal string to std_logic_vector
function d (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector;
-- if rtn_len is < than x'length*4, result will be truncated on the left
-- if x is other than characters 0 to 9 or x,X,z,Z,u,U,-,w,W,
-- result will be 0
-- octal string to std_logic_vector
function o (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector;
-- if rtn_len is < than x'length*4, result will be truncated on the left
-- if x is other than characters 0 to 7 or x,X,z,Z,u,U,-,w,W,
-- result will be 0
-- binary string to std_logic_vector
function b (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector;
-- if rtn_len is < than x'length*4, result will be truncated on the left
-- if x is other than characters 0 to 1 or x,X,z,Z,u,U,-,w,W,
-- result will be 0
-- hex string to natural
function h (x : string)
return natural;
-- if x is other than characters 0 to 9 or a,A to f,F, result will be 0
-- decimal string to natural
function d (x : string)
return natural;
-- if x is other than characters 0 to 9, result will be 0
-- octal string to natural
function o (x : string)
return natural;
-- if x is other than characters 0 to 7, result will be 0
-- binary string to natural
function b (x : string)
return natural;
-- if x is other than characters 0 to 1, result will be 0
-- natural to std_logic_vector
function to_slv (x : natural;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector;
-- if rtn_len is < than sizeof(x), result will be truncated on the left
-- see note above regarding possible formats for x
-- natural to std_logic
function to_sl (x : natural)
return std_logic;
-- natural to time
function to_time (x : natural)
return time;
-- see note above regarding possible formats for x
END conversions;
--
--------------------------------------------------------------------------------
--
PACKAGE BODY conversions IS
-- private declarations for this package
type basetype is (binary, octal, decimal, hex);
function max(x,y: integer) return integer is
begin
if x > y then return x; else return y; end if;
end max;
function min(x,y: integer) return integer is
begin
if x < y then return x; else return y; end if;
end min;
-- consider function sizeof for string/slv/???, return natural
-- function size(len: natural) return natural is
-- begin
-- if len=0 then
-- return 31;
-- else return len;
-- end if;
-- end size;
function nextmultof (x : positive;
size : positive) return positive is
begin
case x mod size is
when 0 => return size * x/size;
when others => return size * (x/size + 1);
end case;
end nextmultof;
function rtn_base (base : basetype) return character is
begin
case base is
when binary => return 'b';
when octal => return 'o';
when decimal => return 'd';
when hex => return 'h';
end case;
end rtn_base;
function format (r : string;
base : basetype;
rtn_len : natural ;
justify : justify_side;
basespec : b_spec) return string is
variable int_rtn_len : integer;
begin
if basespec=yes then
int_rtn_len := rtn_len - 3;
else
int_rtn_len := rtn_len;
end if;
if int_rtn_len <= r'length then
case basespec is
when no => return r ;
when yes => return rtn_base(base) & '"' & r & '"';
end case;
else
case justify is
when left =>
case basespec is
when no =>
return r & fill(' ',int_rtn_len - r'length);
when yes =>
return rtn_base(base) & '"' & r & '"' &
fill(' ',int_rtn_len - r'length);
end case;
when right =>
case basespec is
when no =>
return fill(' ',int_rtn_len - r'length) & r ;
when yes =>
return fill(' ',int_rtn_len - r'length) &
rtn_base(base) & '"' & r & '"';
end case;
end case;
end if;
end format;
-- convert numeric string of any base to natural
function cnvt_base (x : string;
inbase : natural range 2 to 16) return natural is
-- assumes x is an unsigned number string of base 'inbase'
-- values larger than natural'high are not supported
variable r,t : natural := 0;
variable place : positive := 1;
begin
for i in x'reverse_range loop
case x(i) is
when '0' => t := 0;
when '1' => t := 1;
when '2' => t := 2;
when '3' => t := 3;
when '4' => t := 4;
when '5' => t := 5;
when '6' => t := 6;
when '7' => t := 7;
when '8' => t := 8;
when '9' => t := 9;
when 'a'|'A' => t := 10;
when 'b'|'B' => t := 11;
when 'c'|'C' => t := 12;
when 'd'|'D' => t := 13;
when 'e'|'E' => t := 14;
when 'f'|'F' => t := 15;
when '_' => t := 0; -- ignore these characters
place := place / inbase;
when others =>
assert false
report lf &
"CNVT_BASE found input value larger than base: " & lf &
"Input value: " & x(i) &
" Base: " & to_int_str(inbase) & lf &
"converting input to integer 0"
severity warning;
return 0;
end case;
if t / inbase > 1 then -- invalid value for base
assert false
report lf &
"CNVT_BASE found input value larger than base: " & lf &
"Input value: " & x(i) &
" Base: " & to_int_str(inbase) & lf &
"converting input to integer 0"
severity warning;
return 0;
else
r := r + (t * place);
place := place * inbase;
end if;
end loop;
return r;
end cnvt_base;
function extend (x : std_logic;
len : positive) return std_logic_vector is
variable v : std_logic_vector(1 to len) := (others => x);
begin
return v;
end extend;
-- implementation of public declarations
function to_bin_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable int : std_logic_vector(1 to x'length):=x;
variable r : string(1 to x'length):=(others=>'$');
begin
for i in int'range loop
r(i to i) := to_bin_str(int(i),basespec=>no);
end loop;
return format (r,binary,rtn_len,justify,basespec);
end to_bin_str;
function to_bin_str(x : std_logic;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable r : string(1 to 1);
begin
case x is
when '0' => r(1) := '0';
when '1' => r(1) := '1';
when 'U' => r(1) := 'U';
when 'X' => r(1) := 'X';
when 'Z' => r(1) := 'Z';
when 'W' => r(1) := 'W';
when 'H' => r(1) := 'H';
when 'L' => r(1) := 'L';
when '-' => r(1) := '-';
end case;
return format (r,binary,rtn_len,justify,basespec);
end to_bin_str;
function to_bin_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable int : natural := x;
variable ptr : positive range 2 to 32 := 32;
variable r : string(2 to 32):=(others=>'$');
begin
if int = 0 then
return format ("0",binary,rtn_len,justify,basespec);
end if;
while int > 0 loop
case int rem 2 is
when 0 => r(ptr) := '0';
when 1 => r(ptr) := '1';
when others =>
assert false report lf & "TO_BIN_STR, shouldn't happen"
severity failure;
return "$";
null;
end case;
int := int / 2;
ptr := ptr - 1;
end loop;
return format (r(ptr+1 to 32),binary,rtn_len,justify,basespec);
end to_bin_str;
function to_hex_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
-- will return x'length/4
variable nxt : positive := nextmultof(x'length,4);
variable int : std_logic_vector(1 to nxt):= (others => '0');
variable ptr : positive range 1 to (nxt/4)+1 := 1;
variable r : string(1 to nxt/4):=(others=>'$');
subtype slv4 is std_logic_vector(1 to 4);
begin
int(nxt-x'length+1 to nxt) := x;
if nxt-x'length > 0 and x(x'left) /= '1' then
int(1 to nxt-x'length) := extend(x(x'left),nxt-x'length);
end if;
for i in int'range loop
next when i rem 4 /= 1;
case slv4'(int(i to i+3)) is
when "0000" => r(ptr) := '0';
when "0001" => r(ptr) := '1';
when "0010" => r(ptr) := '2';
when "0011" => r(ptr) := '3';
when "0100" => r(ptr) := '4';
when "0101" => r(ptr) := '5';
when "0110" => r(ptr) := '6';
when "0111" => r(ptr) := '7';
when "1000" => r(ptr) := '8';
when "1001" => r(ptr) := '9';
when "1010" => r(ptr) := 'A';
when "1011" => r(ptr) := 'B';
when "1100" => r(ptr) := 'C';
when "1101" => r(ptr) := 'D';
when "1110" => r(ptr) := 'E';
when "1111" => r(ptr) := 'F';
when "ZZZZ" => r(ptr) := 'Z';
when "WWWW" => r(ptr) := 'W';
when "LLLL" => r(ptr) := 'L';
when "HHHH" => r(ptr) := 'H';
when "UUUU" => r(ptr) := 'U';
when "XXXX" => r(ptr) := 'X';
when "----" => r(ptr) := '-';
when others =>
assert false
report lf &
"TO_HEX_STR found illegal value: " &
to_bin_str(int(i to i+3)) & lf &
"converting input to '-'"
severity warning;
r(ptr) := '-';
end case;
ptr := ptr + 1;
end loop;
return format (r,hex,rtn_len,justify,basespec);
end to_hex_str;
function to_hex_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable int : natural := x;
variable ptr : positive range 1 to 20 := 20;
variable r : string(1 to 20):=(others=>'$');
begin
if x=0 then return format ("0",hex,rtn_len,justify,basespec); end if;
while int > 0 loop
case int rem 16 is
when 0 => r(ptr) := '0';
when 1 => r(ptr) := '1';
when 2 => r(ptr) := '2';
when 3 => r(ptr) := '3';
when 4 => r(ptr) := '4';
when 5 => r(ptr) := '5';
when 6 => r(ptr) := '6';
when 7 => r(ptr) := '7';
when 8 => r(ptr) := '8';
when 9 => r(ptr) := '9';
when 10 => r(ptr) := 'A';
when 11 => r(ptr) := 'B';
when 12 => r(ptr) := 'C';
when 13 => r(ptr) := 'D';
when 14 => r(ptr) := 'E';
when 15 => r(ptr) := 'F';
when others =>
assert false report lf & "TO_HEX_STR, shouldn't happen"
severity failure;
return "$";
end case;
int := int / 16;
ptr := ptr - 1;
end loop;
return format (r(ptr+1 to 20),hex,rtn_len,justify,basespec);
end to_hex_str;
function to_oct_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
-- will return x'length/3
variable nxt : positive := nextmultof(x'length,3);
variable int : std_logic_vector(1 to nxt):= (others => '0');
variable ptr : positive range 1 to (nxt/3)+1 := 1;
variable r : string(1 to nxt/3):=(others=>'$');
subtype slv3 is std_logic_vector(1 to 3);
begin
int(nxt-x'length+1 to nxt) := x;
if nxt-x'length > 0 and x(x'left) /= '1' then
int(1 to nxt-x'length) := extend(x(x'left),nxt-x'length);
end if;
for i in int'range loop
next when i rem 3 /= 1;
case slv3'(int(i to i+2)) is
when "000" => r(ptr) := '0';
when "001" => r(ptr) := '1';
when "010" => r(ptr) := '2';
when "011" => r(ptr) := '3';
when "100" => r(ptr) := '4';
when "101" => r(ptr) := '5';
when "110" => r(ptr) := '6';
when "111" => r(ptr) := '7';
when "ZZZ" => r(ptr) := 'Z';
when "WWW" => r(ptr) := 'W';
when "LLL" => r(ptr) := 'L';
when "HHH" => r(ptr) := 'H';
when "UUU" => r(ptr) := 'U';
when "XXX" => r(ptr) := 'X';
when "---" => r(ptr) := '-';
when others =>
assert false
report lf &
"TO_OCT_STR found illegal value: " &
to_bin_str(int(i to i+2)) & lf &
"converting input to '-'"
severity warning;
r(ptr) := '-';
end case;
ptr := ptr + 1;
end loop;
return format (r,octal,rtn_len,justify,basespec);
end to_oct_str;
function to_oct_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable int : natural := x;
variable ptr : positive range 1 to 20 := 20;
variable r : string(1 to 20):=(others=>'$');
begin
if x=0 then return format ("0",octal,rtn_len,justify,basespec); end if;
while int > 0 loop
case int rem 8 is
when 0 => r(ptr) := '0';
when 1 => r(ptr) := '1';
when 2 => r(ptr) := '2';
when 3 => r(ptr) := '3';
when 4 => r(ptr) := '4';
when 5 => r(ptr) := '5';
when 6 => r(ptr) := '6';
when 7 => r(ptr) := '7';
when others =>
assert false report lf & "TO_OCT_STR, shouldn't happen"
severity failure;
return "$";
end case;
int := int / 8;
ptr := ptr - 1;
end loop;
return format (r(ptr+1 to 20),octal,rtn_len,justify,basespec);
end to_oct_str;
function to_int_str(x : natural;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes) return string is
variable int : natural := x;
variable ptr : positive range 1 to 32 := 32;
variable r : string(1 to 32):=(others=>'$');
begin
if x=0 then return format ("0",hex,rtn_len,justify,basespec);
else
while int > 0 loop
case int rem 10 is
when 0 => r(ptr) := '0';
when 1 => r(ptr) := '1';
when 2 => r(ptr) := '2';
when 3 => r(ptr) := '3';
when 4 => r(ptr) := '4';
when 5 => r(ptr) := '5';
when 6 => r(ptr) := '6';
when 7 => r(ptr) := '7';
when 8 => r(ptr) := '8';
when 9 => r(ptr) := '9';
when others =>
assert false report lf & "TO_INT_STR, shouldn't happen"
severity failure;
return "$";
end case;
int := int / 10;
ptr := ptr - 1;
end loop;
return format (r(ptr+1 to 32),decimal,rtn_len,justify,basespec);
end if;
end to_int_str;
function to_int_str(x : std_logic_vector;
rtn_len : natural := 0;
justify : justify_side := right;
basespec : b_spec := yes)
return string is
begin
return to_int_str(to_nat(x),rtn_len,justify,basespec);
end to_int_str;
function to_time_str (x : time)
return string is
begin
return to_int_str(to_nat(x),basespec=>no) & " ns";
end to_time_str;
function fill (fill_char : character := '*';
rtn_len : integer := 1)
return string is
variable r : string(1 to max(rtn_len,1)) := (others => fill_char);
variable len : integer;
begin
if rtn_len < 2 then -- always returns at least 1 fill char
len := 1;
else
len := rtn_len;
end if;
return r(1 to len);
end fill;
function to_nat(x : std_logic_vector) return natural is
-- assumes x is an unsigned number, lsb on right,
-- more than 31 bits are truncated on left
variable t : std_logic_vector(1 to x'length) := x;
variable int : std_logic_vector(1 to 31) := (others => '0');
variable r : natural := 0;
variable place : positive := 1;
begin
if x'length < 32 then
int(max(32-x'length,1) to 31) := t(1 to x'length);
else -- x'length >= 32
int(1 to 31) := t(x'length-30 to x'length);
end if;
for i in int'reverse_range loop
case int(i) is
when '1' | 'H' => r := r + place;
when '0' | 'L' => null;
when others =>
assert false
report lf &
"TO_NAT found illegal value: " & to_bin_str(int(i)) & lf &
"converting input to integer 0"
severity warning;
return 0;
end case;
exit when i=1;
place := place * 2;
end loop;
return r;
end to_nat;
function to_nat (x : std_logic)
return natural is
begin
case x is
when '0' => return 0 ;
when '1' => return 1 ;
when others =>
assert false
report lf &
"TO_NAT found illegal value: " & to_bin_str(x) & lf &
"converting input to integer 0"
severity warning;
return 0;
end case;
end to_nat;
function to_nat (x : time)
return natural is
begin
return x / 1 ns;
end to_nat;
function h(x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector is
-- if rtn_len is < than x'length*4, result will be truncated on the left
-- if x is other than characters 0 to 9 or a,A to f,F or
-- x,X,z,Z,u,U,-,w,W,
-- those result bits will be set to 0
variable int : string(1 to x'length) := x;
variable size: positive := max(x'length*4,rtn_len);
variable ptr : integer range -3 to size := size;
variable r : std_logic_vector(1 to size) := (others=>'0');
begin
for i in int'reverse_range loop
case int(i) is
when '0' => r(ptr-3 to ptr) := "0000";
when '1' => r(ptr-3 to ptr) := "0001";
when '2' => r(ptr-3 to ptr) := "0010";
when '3' => r(ptr-3 to ptr) := "0011";
when '4' => r(ptr-3 to ptr) := "0100";
when '5' => r(ptr-3 to ptr) := "0101";
when '6' => r(ptr-3 to ptr) := "0110";
when '7' => r(ptr-3 to ptr) := "0111";
when '8' => r(ptr-3 to ptr) := "1000";
when '9' => r(ptr-3 to ptr) := "1001";
when 'a'|'A' => r(ptr-3 to ptr) := "1010";
when 'b'|'B' => r(ptr-3 to ptr) := "1011";
when 'c'|'C' => r(ptr-3 to ptr) := "1100";
when 'd'|'D' => r(ptr-3 to ptr) := "1101";
when 'e'|'E' => r(ptr-3 to ptr) := "1110";
when 'f'|'F' => r(ptr-3 to ptr) := "1111";
when 'U' => r(ptr-3 to ptr) := "UUUU";
when 'X' => r(ptr-3 to ptr) := "XXXX";
when 'Z' => r(ptr-3 to ptr) := "ZZZZ";
when 'W' => r(ptr-3 to ptr) := "WWWW";
when 'H' => r(ptr-3 to ptr) := "HHHH";
when 'L' => r(ptr-3 to ptr) := "LLLL";
when '-' => r(ptr-3 to ptr) := "----";
when '_' => ptr := ptr + 4;
when others =>
assert false
report lf &
"O conversion found illegal input character: " &
int(i) & lf & "converting character to '----'"
severity warning;
r(ptr-3 to ptr) := "----";
end case;
ptr := ptr - 4;
end loop;
return r(size-rtn_len+1 to size);
end h;
function d (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector is
-- if rtn_len is < than binary length of x, result will be truncated on
-- the left
-- if x is other than characters 0 to 9, result will be 0
begin
return to_slv(cnvt_base(x,10),rtn_len);
end d;
function o (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector is
-- if rtn_len is < than x'length*3, result will be truncated on the left
-- if x is other than characters 0 to 7 or or x,X,z,Z,u,U,-,w,W,
-- those result bits will be set to 0
variable int : string(1 to x'length) := x;
variable size: positive := max(x'length*3,rtn_len);
variable ptr : integer range -2 to size := size;
variable r : std_logic_vector(1 to size) := (others=>'0');
begin
for i in int'reverse_range loop
case int(i) is
when '0' => r(ptr-2 to ptr) := "000";
when '1' => r(ptr-2 to ptr) := "001";
when '2' => r(ptr-2 to ptr) := "010";
when '3' => r(ptr-2 to ptr) := "011";
when '4' => r(ptr-2 to ptr) := "100";
when '5' => r(ptr-2 to ptr) := "101";
when '6' => r(ptr-2 to ptr) := "110";
when '7' => r(ptr-2 to ptr) := "111";
when 'U' => r(ptr-2 to ptr) := "UUU";
when 'X' => r(ptr-2 to ptr) := "XXX";
when 'Z' => r(ptr-2 to ptr) := "ZZZ";
when 'W' => r(ptr-2 to ptr) := "WWW";
when 'H' => r(ptr-2 to ptr) := "HHH";
when 'L' => r(ptr-2 to ptr) := "LLL";
when '-' => r(ptr-2 to ptr) := "---";
when '_' => ptr := ptr + 3;
when others =>
assert false
report lf &
"O conversion found illegal input character: " &
int(i) & lf & "converting character to '---'"
severity warning;
r(ptr-2 to ptr) := "---";
end case;
ptr := ptr - 3;
end loop;
return r(size-rtn_len+1 to size);
end o;
function b (x : string;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector is
-- if rtn_len is < than x'length, result will be truncated on the left
-- if x is other than characters 0 to 1 or x,X,z,Z,u,U,-,w,W,
-- those result bits will be set to 0
variable int : string(1 to x'length) := x;
variable size: positive := max(x'length,rtn_len);
variable ptr : integer range 0 to size+1 := size; -- csa
variable r : std_logic_vector(1 to size) := (others=>'0');
begin
for i in int'reverse_range loop
case int(i) is
when '0' => r(ptr) := '0';
when '1' => r(ptr) := '1';
when 'U' => r(ptr) := 'U';
when 'X' => r(ptr) := 'X';
when 'Z' => r(ptr) := 'Z';
when 'W' => r(ptr) := 'W';
when 'H' => r(ptr) := 'H';
when 'L' => r(ptr) := 'L';
when '-' => r(ptr) := '-';
when '_' => ptr := ptr + 1;
when others =>
assert false
report lf &
"B conversion found illegal input character: " &
int(i) & lf & "converting character to '-'"
severity warning;
r(ptr) := '-';
end case;
ptr := ptr - 1;
end loop;
return r(size-rtn_len+1 to size);
end b;
function h (x : string)
return natural is
-- only following characters are allowed, otherwise result will be 0
-- 0 to 9
-- a,A to f,F
-- blanks, underscore
begin
return cnvt_base(x,16);
end h;
function d (x : string)
return natural is
-- only following characters are allowed, otherwise result will be 0
-- 0 to 9
-- blanks, underscore
begin
return cnvt_base(x,10);
end d;
function o (x : string)
return natural is
-- only following characters are allowed, otherwise result will be 0
-- 0 to 7
-- blanks, underscore
begin
return cnvt_base(x,8);
end o;
function b (x : string)
return natural is
-- only following characters are allowed, otherwise result will be 0
-- 0 to 1
-- blanks, underscore
begin
return cnvt_base(x,2);
end b;
function to_slv(x : natural;
rtn_len : positive range 1 to 32 := 32)
return std_logic_vector is
-- if rtn_len is < than sizeof(x), result will be truncated on the left
variable int : natural := x;
variable ptr : positive := 32;
variable r : std_logic_vector(1 to 32) := (others=>'0');
begin
while int > 0 loop
case int rem 2 is
when 0 => r(ptr) := '0';
when 1 => r(ptr) := '1';
when others =>
assert false report lf & "TO_SLV, shouldn't happen"
severity failure;
return "0";
end case;
int := int / 2;
ptr := ptr - 1;
end loop;
return r(33-rtn_len to 32);
end to_slv;
function to_sl(x : natural)
return std_logic is
variable r : std_logic := '0';
begin
case x is
when 0 => null;
when 1 => r := '1';
when others =>
assert false
report lf &
"TO_SL found illegal input character: " &
to_int_str(x) & lf & "converting character to '-'"
severity warning;
return '-';
end case;
return r;
end to_sl;
function to_time (x: natural) return time is
begin
return x * 1 ns;
end to_time;
END conversions;