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[/] [uart/] [trunk/] [uart_lib.vhd] - Blame information for rev 10

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1 2 olupas
--===========================================================================--
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--
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--  S Y N T H E Z I A B L E    miniUART   C O R E
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--
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--  www.OpenCores.Org - January 2000
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--  This core adheres to the GNU public license  
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--
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-- Design units   : UART_Def
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--
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-- File name      : uart_lib.vhd
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--
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-- Purpose        : Implements an miniUART device for communication purposes 
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--                  between the OR1K processor and the Host computer through
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--                  an RS-232 communication protocol.
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--                  
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-- Library        : uart_lib.vhd
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--
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-- Dependencies   : IEEE.Std_Logic_1164
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--
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--===========================================================================--
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-------------------------------------------------------------------------------
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-- Revision list
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-- Version   Author                 Date                        Changes
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--
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-- 0.1      Ovidiu Lupas     15 January 2000                   New model
26 7 olupas
--        olupas@opencores.org
27 2 olupas
-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------- 
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-- package UART_Def
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-------------------------------------------------------------------------------- 
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library IEEE,STD;
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use IEEE.Std_Logic_1164.all;
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use IEEE.Numeric_Std.all;
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--**--
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package UART_Def is
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      -----------------------------------------------------------------------------
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      -- Converts unsigned Std_LOGIC_Vector to Integer, leftmost bit is MSB
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      -- Error message for unknowns (U, X, W, Z, -), converted to 0
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      -- Verifies whether vector is too long (> 16 bits)
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      -----------------------------------------------------------------------------
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      function  ToInteger (
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         Invector : in  Unsigned(3 downto 0))
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       return     Integer;
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end UART_Def; --==================== End of package header ======================--
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package body UART_Def is
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  function  ToInteger (
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       InVector : in Unsigned(3 downto 0))
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      return  Integer is
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    constant HeaderMsg   : String          := "To_Integer:";
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    constant MsgSeverity : Severity_Level  := Warning;
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    variable Value       : Integer         := 0;
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  begin
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    for i in 0 to 3 loop
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      if (InVector(i) = '1') then
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         Value := Value + (2**I);
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      end if;
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    end loop;
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    return Value;
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  end ToInteger;
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end UART_Def; --================ End of package body ================--
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