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-- Company:
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--
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-- File: cp_Stack.vhd
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--
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-- Description:
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-- projet copyblaze
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-- Program Counter stack
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--
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-- File history:
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-- v1.0: 07/10/11: Creation
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--
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-- Targeted device: ProAsic A3P250 VQFP100
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-- Author: AbdAllah Meziti
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--------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use work.Usefull_Pkg.all; -- Usefull Package
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--------------------------------------------------------------------------------
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-- Entity: cp_Stack
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--
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-- Description:
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--
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-- REMARQUE:
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--
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--
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-- History:
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-- 07/10/11 AM: Creation
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-- ---------------------
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-- xx/xx/xx AM:
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--
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--------------------------------------------------------------------------------
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entity cp_Stack is
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generic
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(
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GEN_WIDTH_PC : positive := 8;
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GEN_DETPH : positive := 15
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);
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port (
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--------------------------------------------------------------------------------
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-- Signaux Systeme
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--------------------------------------------------------------------------------
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Clk_i : in std_ulogic; -- signal d'horloge générale
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Rst_i_n : in std_ulogic; -- signal de reset générale
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--------------------------------------------------------------------------------
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-- Signaux Fonctionels
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--------------------------------------------------------------------------------
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Data_i : in std_ulogic_vector(GEN_WIDTH_PC-1 downto 0); --
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Data_o : out std_ulogic_vector(GEN_WIDTH_PC-1 downto 0); --
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Enable_i : in std_ulogic;
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Push_i : in std_ulogic;
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Pop_i : in std_ulogic
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);
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end cp_Stack;
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--------------------------------------------------------------------------------
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-- Architecture: RTL
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-- of entity : cp_Stack
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--------------------------------------------------------------------------------
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architecture rtl of cp_Stack is
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--------------------------------------------------------------------------------
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-- Définition des fonctions
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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-- Définition des constantes
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--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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-- Définition des signaux interne
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--------------------------------------------------------------------------------
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type RAM_TYPE is array (0 to GEN_DETPH-1) of std_ulogic_vector(GEN_WIDTH_PC-1 downto 0);--(Data_i'range);
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signal iStackMem : RAM_TYPE;
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signal iStackEn : std_ulogic;
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signal iPointer : natural range 0 to GEN_DETPH-1;
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signal iPtrUp : std_ulogic;
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signal iPtrDown : std_ulogic;
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signal iTempo : std_ulogic_vector(GEN_WIDTH_PC-1 downto 0);
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--------------------------------------------------------------------------------
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-- Déclaration des composants
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--------------------------------------------------------------------------------
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begin
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iStackEn <= not(Enable_i) and Push_i;
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--------------------------------------------------------------------------------
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-- Process : Stack_Proc
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-- Description: Stack Memory
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--------------------------------------------------------------------------------
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Stack_Proc : process(Rst_i_n, Clk_i)
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begin
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if ( Rst_i_n = '0' ) then
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for i in 0 to GEN_DETPH-1 loop
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iStackMem(i) <= (others=>'0');
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end loop;
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iTempo <= (others=>'0');
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elsif ( rising_edge(Clk_i) ) then
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if ( iPtrUp = '1' ) then
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iTempo <= Data_i;
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end if;
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if ( iStackEn = '1' ) then
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iStackMem( iPointer ) <= iTempo;
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end if;
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end if;
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end process Stack_Proc;
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iPtrUp <= Enable_i and Push_i;
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iPtrDown <= Enable_i and Pop_i;
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--------------------------------------------------------------------------------
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-- Process : Ptr_Proc
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-- Description: Stack pointer
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--------------------------------------------------------------------------------
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Ptr_Proc : process(Rst_i_n, Clk_i)
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begin
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if ( Rst_i_n = '0' ) then
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iPointer <= GEN_DETPH-1;
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elsif ( rising_edge(Clk_i) ) then
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if ( iPtrUp = '1' ) then
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if ( iPointer + 1 = GEN_DETPH ) then
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iPointer <= 0;
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else
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iPointer <= (iPointer + 1) ;
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end if;
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end if;
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if ( iPtrDown = '1' ) then
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if ( iPointer = 0 ) then
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iPointer <= GEN_DETPH-1;
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else
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iPointer <= (iPointer - 1) ;
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end if;
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end if;
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end if;
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end process Ptr_Proc;
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Data_o <= iStackMem( iPointer );
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end rtl;
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