220model.vhd

一本老师推荐的经典的VHDL覆盖基础的入门书籍

---------------------------------------------------------------------------
-- This VHDL file was developed by Altera Corporation.  It may be
-- freely copied and/or distributed at no cost.  Any persons using this
-- file for any purpose do so at their own risk, and are responsible for
-- the results of such use.  Altera Corporation does not guarantee that
-- this file is complete, correct, or fit for any particular purpose.
-- NO WARRANTY OF ANY KIND IS EXPRESSED OR IMPLIED.  This notice must
-- accompany any copy of this file.
--------------------------------------------------------------------------
--
-- Quartus II 4.0 Build 190 1/28/2004
--
--------------------------------------------------------------------------
-- LPM Synthesizable Models (Support string type generic)
-- These models are based on LPM version 220 (EIA-IS103 October 1998).
--------------------------------------------------------------------------
--
-------------------------------------------------------------------------------
-- Assumptions:
--
-- 1. All ports and signal types are std_logic or std_logic_vector
--    from IEEE 1164 package.
-- 2. Synopsys std_logic_arith, std_logic_unsigned, and std_logic_signed
--    package are assumed to be accessible from IEEE library.
-- 3. lpm_component_package must be accessible from library work.
-- 4. The default value of LPM_SVALUE, LPM_AVALUE, LPM_MODULUS, LPM_HINT,
--    LPM_NUMWORDS, LPM_STRENGTH, LPM_DIRECTION, and LPM_PVALUE is
--    string "UNUSED".
------------------------------------------------------------------------------- 

---START_PACKAGE_HEADER--------------------------------------------------------
--
-- Package Name    :  LPM_DEVICE_FAMILIES
--
-- Description     :  Common Altera device families comparison
--
---END_PACKAGE_HEADER----------------------------------------------------------

-- BEGINING OF PACKAGE
Library ieee;
use ieee.std_logic_1164.all;

-- PACKAGE DECLARATION
package LPM_DEVICE_FAMILIES is
-- FUNCTION DECLARATION
    function IS_VALID_FAMILY (device: in string) return boolean;
    function IS_FAMILY_APEX20K (device : in string) return boolean;
    function IS_FAMILY_APEX20KE (device : in string) return boolean;
    function IS_FAMILY_APEXII (device : in string) return boolean;
    function IS_FAMILY_ACEX2K (device : in string) return boolean;
    function IS_FAMILY_STRATIXGX (device : in string) return boolean;
    function IS_FAMILY_STRATIX (device : in string) return boolean;
    function IS_FAMILY_MERCURY (device : in string) return boolean;
    function IS_FAMILY_MAX (device : in string) return boolean;
    function IS_FAMILY_FLEX6000 (device : in string) return boolean;
    function IS_FAMILY_FLEX8000 (device : in string) return boolean;
    function IS_FAMILY_FLEX10K (device : in string) return boolean;
    function IS_FAMILY_FLEX10KE (device : in string) return boolean;
    function IS_FAMILY_STRATIXII (device : in string) return boolean;
    function IS_FAMILY_MAXII (device : in string) return boolean;
end LPM_DEVICE_FAMILIES;

package body LPM_DEVICE_FAMILIES is
function IS_VALID_FAMILY (device : in string) return boolean is
variable is_valid : boolean := false;
begin
    if (IS_FAMILY_APEX20K(device) or IS_FAMILY_APEX20KE(device) or 
        IS_FAMILY_APEXII(device) or IS_FAMILY_ACEX2K(device) or 
        IS_FAMILY_STRATIXGX(device) or IS_FAMILY_STRATIX(device) or
        IS_FAMILY_MERCURY(device) or IS_FAMILY_MAX(device) or 
        IS_FAMILY_FLEX6000(device) or IS_FAMILY_FLEX8000(device) or 
        IS_FAMILY_FLEX10K(device) or IS_FAMILY_FLEX10KE(device) or
        IS_FAMILY_STRATIXII(device) or IS_FAMILY_MAXII(device))
    then
        is_valid := true;
    end if;
    return is_valid;
end IS_VALID_FAMILY;

function IS_FAMILY_APEX20K (device : in string) return boolean is
variable is_20k : boolean := false;
begin
    if (device = "APEX20K")
    then
        is_20k := true;
    end if;
    return is_20k;
end IS_FAMILY_APEX20K;

function IS_FAMILY_APEX20KE (device : in string) return boolean is
variable is_20ke : boolean := false;
begin
    if ((device = "APEX20KE") or (device = "APEX20KC") or (device = "EXCALIBUR_ARM") or
    (device = "EXCALIBUR_MIPS"))
    then
        is_20ke := true;
    end if;
    return is_20ke;
end IS_FAMILY_APEX20KE;

function IS_FAMILY_APEXII (device : in string) return boolean is
variable is_apexii : boolean := false;
begin
    if ((device = "APEX II") or (device = "APEXII")) 
    then
        is_apexii := true;
    end if;
    return is_apexii;
end IS_FAMILY_APEXII;

function IS_FAMILY_ACEX2K (device : in string) return boolean is
variable is_acex2k : boolean := false;
begin
    if ((device = "CYCLONE") or (device = "Cyclone"))
    then
        is_acex2k := true;
    end if;
    return is_acex2k;
end IS_FAMILY_ACEX2K;

function IS_FAMILY_STRATIXGX (device : in string) return boolean is
variable is_stratixgx : boolean := false;
begin
    if ((device = "STRATIX-GX") or (device = "STRATIX GX") or (device = "Stratix GX"))
    then
        is_stratixgx := true;
    end if;
    return is_stratixgx;
end IS_FAMILY_STRATIXGX;

function IS_FAMILY_STRATIX (device : in string) return boolean is
variable is_stratix : boolean := false;
begin
    if ((device = "STRATIX") or (device = "Stratix"))
    then 
        is_stratix := true;
    end if;
    return is_stratix;
end IS_FAMILY_STRATIX;

function IS_FAMILY_MERCURY (device : in string) return boolean is
variable is_mercury : boolean := false;
begin
    if ((device = "MERCURY") or (device = "Mercury"))
    then
        is_mercury := true;
    end if;
    return is_mercury;
end IS_FAMILY_MERCURY;

function IS_FAMILY_MAX (device : in string) return boolean is
variable is_max : boolean := false;
begin
    if ((device = "MAX5000") or (device = "MAX3000A") or (device = "MAX7000") or
        (device = "MAX7000A") or (device = "MAX7000AE") or (device = "MAX7000E") or
        (device = "MAX7000S") or (device = "MAX7000B") or (device = "MAX9000"))
    then
        is_max := true;
    end if;
    return is_max;
end IS_FAMILY_MAX;

function IS_FAMILY_FLEX6000 (device : in string) return boolean is
variable is_flex6k : boolean := false;
begin
    if (device = "FLEX6000")
    then
        is_flex6k := true;
    end if;
    return is_flex6k;
end IS_FAMILY_FLEX6000;

function IS_FAMILY_FLEX8000 (device : in string) return boolean is
variable is_flex8k : boolean := false;
begin
    if (device = "FLEX8000")
    then
        is_flex8k := true;
    end if;
    return is_flex8k;
end IS_FAMILY_FLEX8000;

function IS_FAMILY_FLEX10K (device : in string) return boolean is
variable is_flex10k : boolean := false;
begin
    if ((device = "FLEX10K") or (device = "FLEX10KA"))
    then
        is_flex10k := true;
    end if;
    return is_flex10k;
end IS_FAMILY_FLEX10K;

function IS_FAMILY_FLEX10KE (device : in string) return boolean is
variable is_flex10ke : boolean := false;
begin
    if ((device = "FLEX10KE") or (device = "FLEX 10KE") or
        (device = "ACEX1K") or (device = "ACEX 1K"))
    then
        is_flex10ke := true;
    end if;
    return is_flex10ke;
end IS_FAMILY_FLEX10KE;

function IS_FAMILY_STRATIXII (device : in string) return boolean is
variable is_stratixii : boolean := false;
begin
    if (device = "Stratix II")
    then
        is_stratixii := true;
    end if;
    return is_stratixii;
end IS_FAMILY_STRATIXII;

function IS_FAMILY_MAXII (device : in string) return boolean is
variable is_maxii : boolean := false;
begin
    if ((device = "MAX II") or (device = "max ii") or
        (device = "MAXII") or (device = "maxii"))
    then
        is_maxii := true;
    end if;
    return is_maxii;
end IS_FAMILY_MAXII;

end LPM_DEVICE_FAMILIES;
-- END OF PACKAGE

---START_PACKAGE_HEADER-----------------------------------------------------
--
-- Package Name    :  LPM_COMMON_CONVERSION
--
-- Description     :  Common conversion functions
--
---END_PACKAGE_HEADER--------------------------------------------------------

-- BEGINING OF PACKAGE
Library ieee;
use ieee.std_logic_1164.all;
use std.textio.all;

-- PACKAGE DECLARATION
package LPM_COMMON_CONVERSION is
-- FUNCTION DECLARATION
    function STR_TO_INT (str : string) return integer;
    function INT_TO_STR (value : in integer) return string;
    function HEX_STR_TO_INT (str : in string) return integer;
    procedure SHRINK_LINE (str_line : inout line; pos : in integer);
end LPM_COMMON_CONVERSION;

package body LPM_COMMON_CONVERSION is
function STR_TO_INT ( str : string ) return integer is
variable len : integer := str'length;
variable ivalue : integer := 0;
variable digit : integer;
begin
    for i in 1 to len loop
        case str(i) is
            when '0' =>
                digit := 0;
            when '1' =>
                digit := 1;
            when '2' =>
                digit := 2;
            when '3' =>
                digit := 3;
            when '4' =>
                digit := 4;
            when '5' =>
                digit := 5;
            when '6' =>
                digit := 6;
            when '7' =>
                digit := 7;
            when '8' =>
                digit := 8;
            when '9' =>
                digit := 9;
            when others =>
                ASSERT FALSE
                REPORT "Illegal Character "&  str(i) & "in string parameter! "
                SEVERITY ERROR;
        end case;
        ivalue := ivalue * 10 + digit;
    end loop;
    return ivalue;
end STR_TO_INT;

-- This function converts an integer to a string
function INT_TO_STR (value : in integer) return string is
variable ivalue : integer := 0;
variable index  : integer := 0;
variable digit : integer := 0;
variable line_no: string(8 downto 1) := "        ";  
begin
    ivalue := value;
    index := 1;
    
    while (ivalue > 0) loop
        digit := ivalue MOD 10;
        ivalue := ivalue/10;
        case digit is
            when 0 => line_no(index) := '0';
            when 1 => line_no(index) := '1';
            when 2 => line_no(index) := '2';
            when 3 => line_no(index) := '3';
            when 4 => line_no(index) := '4';
            when 5 => line_no(index) := '5';
            when 6 => line_no(index) := '6';
            when 7 => line_no(index) := '7';
            when 8 => line_no(index) := '8';
            when 9 => line_no(index) := '9';
            when others =>
                ASSERT FALSE
                REPORT "Illegal number!"
                SEVERITY ERROR;
        end case;
        index := index + 1;
    end loop;
    
    return line_no;
end INT_TO_STR;

-- This function converts a hexadecimal number to an integer
function HEX_STR_TO_INT (str : in string) return integer is
variable len : integer := str'length;
variable ivalue : integer := 0;
variable digit : integer := 0;
begin
    for i in len downto 1 loop
        case str(i) is
            when '0' => digit := 0;
            when '1' => digit := 1;
            when '2' => digit := 2;
            when '3' => digit := 3;
            when '4' => digit := 4;
            when '5' => digit := 5;
            when '6' => digit := 6;
            when '7' => digit := 7;
            when '8' => digit := 8;
            when '9' => digit := 9;
            when 'A' => digit := 10;
            when 'a' => digit := 10;
            when 'B' => digit := 11;
            when 'b' => digit := 11;
            when 'C' => digit := 12;
            when 'c' => digit := 12;
            when 'D' => digit := 13;
            when 'd' => digit := 13;
            when 'E' => digit := 14;
            when 'e' => digit := 14;
            when 'F' => digit := 15;
            when 'f' => digit := 15;
            when others =>
                ASSERT FALSE
                REPORT "Illegal character "&  str(i) & "in Intel Hex File! "
                SEVERITY ERROR;
        end case;
        ivalue := ivalue * 16 + digit;
    end loop;
    return ivalue;
end HEX_STR_TO_INT;

-- This procedure "cuts" the str_line into desired length
procedure SHRINK_LINE (str_line : inout line; pos : in integer) is
subtype nstring is string(1 to pos);