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[raggedstone] / dhwk / source / pci / connecting_fsm.vhd

-- J.STELZNER
-- INFORMATIK-3 LABOR
-- 23.08.2006
-- File: CONNECTING_FSM.VHD

library ieee;
use ieee.std_logic_1164.all;

entity CONNECTING_FSM is
        port
        (
                PCI_CLOCK :in std_logic;
                RESET :in std_logic;
                PSC_ENABLE :in std_logic;
                SYNC_S_FIFO_EFn :in std_logic;
                SPC_ENABLE :in std_logic;
                SYNC_R_FIFO_FFn :in std_logic;
                S_FIFO_Q_OUT :in std_logic_vector(7 downto 0);
                S_FIFO_READn :out std_logic;
                R_FIFO_WRITEn :out std_logic;
                R_FIFO_D_IN :out std_logic_vector(7 downto 0)
        );
end entity CONNECTING_FSM;

architecture CONNECTING_FSM_DESIGN of CONNECTING_FSM is

        signal REG :std_logic_vector(7 downto 0);
        signal HELP_0,HELP_1 :std_logic;
        signal SIG_LOAD :std_logic;


 --**********************************************************
 --*** CONNECTING FSM CODIERUNG ***
 --**********************************************************
 --
 --
 -- ---------- HELP_0
 -- |--------- HELP_1
 -- ||-------- LOAD
 -- |||------- WRITE
 -- ||||------ READ
 -- |||||
        constant S0 :std_logic_vector(4 downto 0) := "00011";--
        constant S1 :std_logic_vector(4 downto 0) := "01010";--READ
        constant S2 :std_logic_vector(4 downto 0) := "10010";--READ
        constant S3 :std_logic_vector(4 downto 0) := "11110";--READ,LOAD
        constant S4 :std_logic_vector(4 downto 0) := "11011";--
        constant S5 :std_logic_vector(4 downto 0) := "01001";--WRITE
        constant S6 :std_logic_vector(4 downto 0) := "10001";--WRITE
        constant S7 :std_logic_vector(4 downto 0) := "11001";--WRITE

        signal STATES :std_logic_vector(4 downto 0);

 --************************************************************
 --*** FSM SPEICHER-AUTOMAT ***
 --************************************************************

        attribute syn_state_machine : boolean;
        attribute syn_state_machine of STATES : signal is false;

--************************************************************
--*** REGISTER BESCHREIBUNG ***
--************************************************************

begin

        process (PCI_CLOCK)
        begin
                if (rising_edge(PCI_CLOCK)) then
                        if SIG_LOAD = '1' then
                                REG <= S_FIFO_Q_OUT;

                        elsif SIG_LOAD = '0' then
                                REG <= REG;
                        end if;
                end if;
 end process;

 --************************************************************
 --*** FSM BESCHREIBUNG ***
 --************************************************************

process (PCI_CLOCK)
begin
        if (rising_edge(PCI_CLOCK)) then

                if RESET = '1' then
                        STATES <= S0;
                else

                       case STATES is

                       when S0 =>
                               if PSC_ENABLE = '1' and SPC_ENABLE = '1' and SYNC_S_FIFO_EFn = '1' then
                                       STATES <= S1;
                               else
                                       STATES <= S0;
                               end if;

                       when S1 =>
                               STATES <= S2;

                       when S2 =>
                               STATES <= S3;

                       when S3 =>
                               STATES <= S4;

                       when S4 =>
                               if SYNC_R_FIFO_FFn = '1' then
                                       STATES <= S5;
                               else
                                       STATES <= S4;
                               end if;

                       when S5 =>
                               STATES <= S6;

                       when S6 =>
                               STATES <= S7;

                       when S7 =>
                               STATES <= S0;

                       when others =>
                               STATES <= S0;

                        end case; -- STATES
                end if; -- RESET
        end if; -- PCI_CLOCK
end process; -- PROCESS

 --************************************************************
 --*** ZUWEISUNG signal/out <= STATES ***
 --************************************************************

HELP_0 <= STATES(4);
HELP_1 <= STATES(3);
SIG_LOAD <= STATES(2);
R_FIFO_WRITEn <= STATES(1);
S_FIFO_READn <= STATES(0);

R_FIFO_D_IN <= REG;

end architecture CONNECTING_FSM_DESIGN;