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

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

library ieee;
use ieee.std_logic_1164.all;

entity IO_REG is
        port
        (
                PCI_CLOCK :in std_logic;
                PCI_RSTn :in std_logic;
                PCI_FRAMEn :in std_logic;
                PCI_IRDYn :in std_logic;
                PCI_IDSEL :in std_logic;
                PCI_PAR :in std_logic;
                PCI_CBEn :in std_logic_vector ( 3 downto 0);
                OE_PCI_AD :in std_logic;
                IO_DATA :in std_logic_vector (31 downto 0);
                AD_REG :out std_logic_vector (31 downto 0);
                CBE_REGn :out std_logic_vector ( 3 downto 0);
                FRAME_REGn :out std_logic;
                IRDY_REGn :out std_logic;
                IDSEL_REG :out std_logic;
                PAR_REG :out std_logic;
                PCI_AD :out std_logic_vector (31 downto 0) -- t/s
        );
end entity IO_REG;

architecture IO_REG_DESIGN of IO_REG is

        signal REG_AD :std_logic_vector (31 downto 0);
        signal REG_CBEn :std_logic_vector ( 3 downto 0);
        signal REG_FRAMEn :std_logic;
        signal REG_IRDYn :std_logic;
        signal REG_IDSEL :std_logic;
        signal REG_PAR :std_logic;

begin

        process (PCI_CLOCK, PCI_RSTn)
        begin
                if PCI_RSTn = '0' then
                        REG_AD <= X"00000000";
                        REG_CBEn <= "0000";
                        REG_FRAMEn <= '1';
                        REG_IRDYn <= '1';
                        REG_IDSEL <= '0';
                        REG_PAR <= '0';

                elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
                        REG_AD <= IO_DATA;
                        REG_CBEn <= PCI_CBEn;
                        REG_FRAMEn <= PCI_FRAMEn;
                        REG_IRDYn <= PCI_IRDYn;
                        REG_IDSEL <= PCI_IDSEL;
                        REG_PAR <= PCI_PAR;
                end if;
        end process;

        PCI_AD <= REG_AD when OE_PCI_AD ='1' else (others => 'Z');

        AD_REG <= REG_AD;
        CBE_REGn <= REG_CBEn;
        FRAME_REGn <= REG_FRAMEn;
        IRDY_REGn <= REG_IRDYn;
        IDSEL_REG <= REG_IDSEL;
        PAR_REG <= REG_PAR;

end architecture IO_REG_DESIGN;