OpenCores
URL https://opencores.org/ocsvn/copyblaze/copyblaze/trunk

Subversion Repositories copyblaze

[/] [copyblaze/] [trunk/] [copyblaze/] [rtl/] [vhdl/] [cpu/] [cp_Flags.vhd] - Diff between revs 2 and 57

Go to most recent revision | Show entire file | Details | Blame | View Log

Rev 2 Rev 57
Line 1... Line 1...
 
--------------------------------------------------------------------------------
 
-- Company: 
 
--
 
-- File: cp_Flags.vhd
 
--
 
-- Description:
 
--      projet copyblaze
 
--      Flags ZERO & CARRY management
 
--
 
-- File history:
 
-- v1.0: 10/10/11: Creation
 
--
 
-- Targeted device: ProAsic A3P250 VQFP100
 
-- Author: AbdAllah Meziti
 
--------------------------------------------------------------------------------
 
 
 
library ieee;
 
use ieee.std_logic_1164.all;
 
use ieee.numeric_std.all;
 
 
 
use     work.Usefull_Pkg.all;           -- Usefull Package
 
 
 
--------------------------------------------------------------------------------
 
-- Entity: cp_Flags
 
--
 
-- Description:
 
--      
 
--      REMARQUE:
 
--
 
--      
 
-- History:
 
-- 10/10/11 AM: Creation
 
-- ---------------------
 
-- xx/xx/xx AM: 
 
--                              
 
--------------------------------------------------------------------------------
 
entity cp_Flags is
 
        port (
 
        --------------------------------------------------------------------------------
 
        -- Signaux Systeme
 
        --------------------------------------------------------------------------------
 
                Clk_i                           : in std_ulogic;        --      signal d'horloge générale
 
                Rst_i_n                         : in std_ulogic;        --      signal de reset générale
 
 
 
        --------------------------------------------------------------------------------
 
        -- Signaux Fonctionels
 
        --------------------------------------------------------------------------------
 
                Z_i                                     : in std_ulogic;
 
                C_i                                     : in std_ulogic;
 
 
 
                Z_o                                     : out std_ulogic;
 
                C_o                                     : out std_ulogic;
 
 
 
                Push_i                          : in std_ulogic;
 
                Pop_i                           : in std_ulogic;
 
 
 
                Write_i                         : in std_ulogic
 
        );
 
end cp_Flags;
 
 
 
--------------------------------------------------------------------------------
 
-- Architecture: RTL
 
-- of entity : cp_Flags
 
--------------------------------------------------------------------------------
 
architecture rtl of cp_Flags is
 
 
 
        --------------------------------------------------------------------------------
 
        -- Définition des fonctions
 
        --------------------------------------------------------------------------------
 
 
 
 
 
 
 
        --------------------------------------------------------------------------------
 
        -- Définition des constantes
 
        --------------------------------------------------------------------------------
 
 
 
        --------------------------------------------------------------------------------
 
        -- Définition des signaux interne
 
        --------------------------------------------------------------------------------
 
        signal          iZ              : std_ulogic;   -- flag
 
        signal          iC              : std_ulogic;   -- flag
 
 
 
        signal          iZs             : std_ulogic;   -- Shadow flag
 
        signal          iCs             : std_ulogic;   -- Shadow flag
 
 
 
        --------------------------------------------------------------------------------
 
        -- Déclaration des composants
 
        --------------------------------------------------------------------------------
 
 
 
begin
 
 
 
        --------------------------------------------------------------------------------
 
        -- Process : Flags_Proc
 
        -- Description: Flags Management
 
        --------------------------------------------------------------------------------
 
        Flags_Proc : process(Rst_i_n, Clk_i)
 
        begin
 
                if ( Rst_i_n = '0' ) then
 
                        iZ      <=      '0';
 
                        iC      <=      '0';
 
 
 
                elsif ( rising_edge(Clk_i) ) then
 
                        if ( Write_i = '1' ) then
 
                                iZ      <=      Z_i;
 
                                iC      <=      C_i;
 
                        elsif ( Pop_i = '1' ) then
 
                                iZ      <=      iZs;
 
                                iC      <=      iCs;
 
                        end if;
 
                end if;
 
        end process Flags_Proc;
 
 
 
        --------------------------------------------------------------------------------
 
        -- Process : ShadowFlags_Proc
 
        -- Description: Shadow Flags Management
 
        --------------------------------------------------------------------------------
 
        ShadowFlags_Proc : process(Rst_i_n, Clk_i)
 
        begin
 
                if ( Rst_i_n = '0' ) then
 
                        iZs     <=      '0';
 
                        iCs     <=      '0';
 
 
 
                elsif ( rising_edge(Clk_i) ) then
 
                        if ( Push_i = '1' ) then
 
                                iZs     <=      iZ;
 
                                iCs     <=      iC;
 
                        end if;
 
                end if;
 
        end process ShadowFlags_Proc;
 
 
 
        Z_o             <=      iZ;
 
        C_o             <=      iC;
 
 
 
end rtl;
 
 
 
 
 No newline at end of file
 No newline at end of file

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.