sdr_sdram.vhd

ref sdr sdram vhdl代码

    end component;
 attribute syn_black_box of pll1: component is true;	        
         
         
         
	

    -- signal declarations
    signal    ISA       :    std_logic_vector(11 downto 0);                    --SDRAM address output
    signal    IBA       :    std_logic_vector(1 downto 0);                     --SDRAM bank address
    signal    ICS_N     :    std_logic_vector(1 downto 0);                     --SDRAM Chip Selects
    signal    ICKE      :    std_logic;                                        --SDRAM clock enable
    signal    IRAS_N    :    std_logic;                                        --SDRAM Row address Strobe
    signal    ICAS_N    :    std_logic;                                        --SDRAM Column address Strobe
    signal    IWE_N     :    std_logic; 
    signal    DQIN      :    std_logic_vector(DSIZE-1 downto 0);
    signal    IDATAOUT  :    std_logic_vector(DSIZE-1 downto 0);
    signal    DQOUT     :    std_logic_vector(DSIZE-1 downto 0);                                       --SDRAM write enable
                                                                               
    signal    saddr     :    std_logic_vector(ASIZE-1 downto 0);            
    signal    sc_cl     :    std_logic_vector(1 downto 0);                   
    signal    sc_rc     :    std_logic_vector(1 downto 0);                   
    signal    sc_rrd    :    std_logic_vector(3 downto 0);                   
    signal    sc_pm     :    std_logic;                   
    signal    sc_bl     :    std_logic_vector(3 downto 0);                   
    signal    load_mode :    std_logic;                       
    signal    nop       :    std_logic;                 
    signal    reada     :    std_logic;                   
    signal    writea    :    std_logic;                    
    signal    refresh   :    std_logic;                     
    signal    precharge :    std_logic;                       
    signal    oe        :    std_logic;                
    signal    ref_req   :    std_logic;                
    signal    ref_ack   :    std_logic;                
    signal    cm_ack	:    std_logic;                
                             
    signal    CLK133    :    std_logic;                    
    signal    CLK133B   :    std_logic; 
    signal    clklocked :    std_logic;                    

begin

 
	-- instantiate the control interface module
    control1 : control_interface
         generic map (
              ASIZE => ASIZE
         )
         port map  (
	          CLK       => CLK133,
	          RESET_N   => RESET_N,
	          CMD       => CMD,
	          ADDR      => ADDR,
	          REF_ACK   => ref_ack,
	          CM_ACK    => cm_ack,
	          NOP       => nop,
	          READA     => reada,
	          WRITEA    => writea,
	          REFRESH   => refresh,
	          PRECHARGE => precharge,
	          LOAD_MODE => load_mode,
	          SADDR     => saddr,
	          SC_CL     => sc_cl,
	          SC_RC     => sc_rc,
	          SC_RRD    => sc_rrd,
	          SC_PM     => sc_pm,
	          SC_BL     => sc_bl,
	          REF_REQ   => ref_req,
	          CMD_ACK   => CMDACK
         );
	                
	                
    -- instantiate the command module
    command1 : command
         generic map(
              ASIZE 		=> ASIZE, 		
              DSIZE 		=> DSIZE, 		
              ROWSIZE 	=> ROWSIZE, 	
              COLSIZE 	=> COLSIZE, 	
              BANKSIZE 	=> BANKSIZE, 
              ROWSTART 	=> ROWSTART, 
              COLSTART 	=> COLSTART, 
              BANKSTART 	=> BANKSTART
         )
         port map  (
	          CLK       => CLK133,
	          RESET_N   => RESET_N,
	          SADDR     => saddr,
	          NOP       => nop,
	          READA     => reada,
	          WRITEA    => writea,
	          REFRESH   => refresh,
	          PRECHARGE => precharge,
	          LOAD_MODE => load_mode,
	          SC_CL     => sc_cl,
	          SC_RC     => sc_rc,
	          SC_RRD    => sc_rrd,
	          SC_PM     => sc_pm,
	          SC_BL     => sc_bl,
	          REF_REQ   => ref_req,
	          REF_ACK   => ref_ack,
	          CM_ACK    => cm_ack,
	          OE        => oe,
	          SA        => ISA,
	          BA        => IBA,
	          CS_N      => ICS_N,
	          CKE       => ICKE,
	          RAS_N     => IRAS_N,
	          CAS_N     => ICAS_N,
	          WE_N      => IWE_N
         );
	    
	                
    -- instantiate the data path module
    data_path1 : sdr_data_path 
         generic map (
              DSIZE => DSIZE
         )
         port map  (
	          CLK       => CLK133,
	          RESET_N   => RESET_N,
	          OE        => oe,
	          DATAIN    => DATAIN,
	          DM        => DM,
	          DATAOUT   => IDATAOUT,
	          DQM       => DQM,
              DQIN      => DQIN,
              DQOUT     => DQOUT
	    );
	    
    pll : pll1
         port map (
              inclock => CLK,
              locked  => clklocked,
              clock1  => CLK133
         );
              
	    
    -- Add a level flops to the sdram i/o that can be place
    -- by the router into the I/O cells
    process(CLK133)
    begin
         if rising_edge(CLK133) then
              SA        <= ISA;
              BA        <= IBA;
              CS_N      <= ICS_N;
              CKE       <= ICKE;
              RAS_N     <= IRAS_N;
              CAS_N     <= ICAS_N;
              WE_N      <= IWE_N;
              DQIN      <= DQ;
              DATAOUT   <= IDATAOUT;
         end if;
    end process;

    -- tri-state the data bus using the OE signal from the main controller.
	
DQ <= DQOUT when OE = '1' else (others => 'Z');


end RTL;