atahost_top.vhd

硬盘接口的硬件实现

		PIO_cmdport_T1,
		PIO_cmdport_T2,
		PIO_cmdport_T4,
		PIO_cmdport_Teoc : in unsigned(7 downto 0);
		PIO_cmdport_IORDYen : in std_logic;           -- PIO compatible timing settings
	
		PIO_dport0_T1,
		PIO_dport0_T2,
		PIO_dport0_T4,
		PIO_dport0_Teoc : in unsigned(7 downto 0);
		PIO_dport0_IORDYen : in std_logic;            -- PIO data-port device0 timing settings

		PIO_dport1_T1,
		PIO_dport1_T2,
		PIO_dport1_T4,
		PIO_dport1_Teoc : in unsigned(7 downto 0);
		PIO_dport1_IORDYen : in std_logic;            -- PIO data-port device1 timing settings

		PIOsel : in std_logic;                        -- PIO controller select
		PIOack : out std_logic;                       -- PIO controller acknowledge
		PIOq : out std_logic_vector(15 downto 0);     -- PIO data out
		PIOtip : buffer std_logic;                    -- PIO transfer in progress
		PIOpp_full : out std_logic;                   -- PIO Write PingPong full

		-- DMA registers
		DMA_dev0_Td,
		DMA_dev0_Tm,
		DMA_dev0_Teoc : in unsigned(7 downto 0);      -- DMA timing settings for device0

		DMA_dev1_Td,
		DMA_dev1_Tm,
		DMA_dev1_Teoc : in unsigned(7 downto 0);      -- DMA timing settings for device1

		DMActrl_DMAen,
		DMActrl_dir,
		DMActrl_BeLeC0,
		DMActrl_BeLeC1 : in std_logic;                -- DMA settings

		DMAsel : in std_logic;                        -- DMA controller select
		DMAack : out std_logic;                       -- DMA controller acknowledge
		DMAq : out std_logic_vector(31 downto 0);     -- DMA data out
		DMAtip : buffer std_logic;                    -- DMA transfer in progress
		DMA_dmarq : out std_logic;                    -- Synchronized ATA DMARQ line

		DMATxFull : buffer std_logic;                 -- DMA transmit buffer full
		DMARxEmpty : buffer std_logic;                -- DMA receive buffer empty

		DMA_req : out std_logic;                      -- DMA request to external DMA engine
		DMA_ack : in std_logic;                       -- DMA acknowledge from external DMA engine

		-- ATA signals
		RESETn	: out std_logic;
		DDi	: in std_logic_vector(15 downto 0);
		DDo : out std_logic_vector(15 downto 0);
		DDoe : out std_logic;
		DA	: out unsigned(2 downto 0);
		CS0n	: out std_logic;
		CS1n	: out std_logic;

		DMARQ	: in std_logic;
		DMACKn	: out std_logic;
		DIORn	: out std_logic;
		DIOWn	: out std_logic;
		IORDY	: in std_logic;
		INTRQ	: in std_logic
	);
	end component atahost_controller;

	-- asynchronous reset signal
	signal arst_signal : std_logic;

	-- primary address decoder
	signal PIOsel, DMAsel : std_logic;        -- controller select, IDE devices select

	-- registers
	-- IDE control register
	signal IDEctrl_IDEen, IDEctrl_rst, IDEctrl_ppen, IDEctrl_FATR0, IDEctrl_FATR1 : std_logic;
	-- PIO compatible timing settings
	signal PIO_cmdport_T1, PIO_cmdport_T2, PIO_cmdport_T4, PIO_cmdport_Teoc : unsigned(7 downto 0);
	signal PIO_cmdport_IORDYen : std_logic;
	-- PIO data register device0 timing settings
	signal PIO_dport0_T1, PIO_dport0_T2, PIO_dport0_T4, PIO_dport0_Teoc : unsigned(7 downto 0);
	signal PIO_dport0_IORDYen : std_logic;  
	-- PIO data register device1 timing settings
	signal PIO_dport1_T1, PIO_dport1_T2, PIO_dport1_T4, PIO_dport1_Teoc : unsigned(7 downto 0);
	signal PIO_dport1_IORDYen : std_logic;
	-- DMA control register
	signal DMActrl_DMAen, DMActrl_dir, DMActrl_BeLeC0, DMActrl_BeLeC1 : std_logic;
	-- DMA data port device0 timing settings
	signal DMA_dev0_Td, DMA_dev0_Tm, DMA_dev0_Teoc : unsigned(7 downto 0);
	-- DMA data port device1 timing settings
	signal DMA_dev1_Td, DMA_dev1_Tm, DMA_dev1_Teoc : unsigned(7 downto 0);

	signal PIOack, DMAack, PIOtip, DMAtip : std_logic;
	signal PIOq : std_logic_vector(15 downto 0);
	signal PIOpp_full : std_logic;
	signal DMAq : std_logic_vector(31 downto 0);
	signal DMA_dmarq : std_logic; -- synchronized version of DMARQ

	signal DMATxFull, DMARxEmpty : std_logic;

	signal irq : std_logic; -- ATA bus IRQ signal

begin
	-- generate asynchronous reset level
	arst_signal <= arst_i xor ARST_LVL;

	--
	-- hookup wishbone slave
	--
	u0: atahost_wb_slave 
		generic map(
			DeviceID   => DeviceID,
			RevisionNo => RevisionNo,

			-- PIO mode 0 settings
			PIO_mode0_T1 => PIO_mode0_T1,
			PIO_mode0_T2 => PIO_mode0_T2,
			PIO_mode0_T4 => PIO_mode0_T4,
			PIO_mode0_Teoc => PIO_mode0_Teoc,

			-- Multiword DMA mode 0 settings
			-- OCIDEC-1 does not support DMA, set registers to zero
			DMA_mode0_Tm   => 0,
			DMA_mode0_Td   => 0,
			DMA_mode0_Teoc => 0
		)
		port map(
			-- WISHBONE SYSCON signals
			clk_i => wb_clk_i,
			arst_i => arst_signal,
			rst_i  => wb_rst_i,

			-- WISHBONE SLAVE signals
			cyc_i => wb_cyc_i,
			stb_i => wb_stb_i,
			ack_o => wb_ack_o,
			rty_o => wb_rty_o,
			err_o => wb_err_o,
			adr_i => wb_adr_i,
			dat_i => wb_dat_i,
			dat_o => wb_dat_o,
			sel_i => wb_sel_i,
			we_i  => wb_we_i,
			inta_o => wb_inta_o,

			-- PIO control inputs
			PIOsel     => PIOsel,
			PIOtip     => PIOtip,
			PIOack     => PIOack,
			PIOq       => PIOq,
			PIOpp_full => PIOpp_full,
			irq        => irq,

			-- DMA control inputs
			DMAsel     => DMAsel,
			DMAtip     => DMAtip,
			DMAack     => DMAack,
			DMARxEmpty => DMARxEmpty,
			DMATxFull  => DMATxFull,
			DMA_dmarq  => DMA_dmarq,
			DMAq       => DMAq,

			-- outputs
			-- control register outputs
			IDEctrl_rst   => IDEctrl_rst,
			IDEctrl_IDEen => IDEctrl_IDEen,
			IDEctrl_FATR0 => IDEctrl_FATR0,
			IDEctrl_FATR1 => IDEctrl_FATR1,
			IDEctrl_ppen  => IDEctrl_ppen,

			DMActrl_DMAen  => DMActrl_DMAen,
			DMActrl_dir    => DMActrl_dir,
			DMActrl_BeLeC0 => DMActrl_BeLeC0,
			DMActrl_BeLeC1 => DMActrl_BeLeC1,

			-- CMD port timing registers
			PIO_cmdport_T1 => PIO_cmdport_T1,
			PIO_cmdport_T2 => PIO_cmdport_T2,
			PIO_cmdport_T4 => PIO_cmdport_T4,
			PIO_cmdport_Teoc => PIO_cmdport_Teoc,
			PIO_cmdport_IORDYen => PIO_cmdport_IORDYen,

			-- data-port0 timing registers
			PIO_dport0_T1 => PIO_dport0_T1,
			PIO_dport0_T2 => PIO_dport0_T2,
			PIO_dport0_T4 => PIO_dport0_T4,
			PIO_dport0_Teoc => PIO_dport0_Teoc,
			PIO_dport0_IORDYen => PIO_dport0_IORDYen,

			-- data-port1 timing registers
			PIO_dport1_T1 => PIO_dport1_T1,
			PIO_dport1_T2 => PIO_dport1_T2,
			PIO_dport1_T4 => PIO_dport1_T4,
			PIO_dport1_Teoc => PIO_dport1_Teoc,
			PIO_dport1_IORDYen => PIO_dport1_IORDYen,

			-- DMA device0 timing registers
			DMA_dev0_Tm => DMA_dev0_Tm,
			DMA_dev0_Td => DMA_dev0_Td,
			DMA_dev0_Teoc => DMA_dev0_Teoc,

			-- DMA device1 timing registers
			DMA_dev1_Tm => DMA_dev1_Tm,
			DMA_dev1_Td => DMA_dev1_Td,
			DMA_dev1_Teoc => DMA_dev1_Teoc
		);


	--
	-- hookup controller section
	--
	u1: atahost_controller
		generic map(
			TWIDTH => TWIDTH,
			PIO_mode0_T1   => PIO_mode0_T1,
			PIO_mode0_T2   => PIO_mode0_T2,
			PIO_mode0_T4   => PIO_mode0_T4,
			PIO_mode0_Teoc => PIO_mode0_Teoc,
			DMA_mode0_Tm   => DMA_mode0_Tm,
			DMA_mode0_Td   => DMA_mode0_Td,
			DMA_mode0_Teoc => DMA_mode0_Teoc
		)
		port map(
			clk    => wb_clk_i,
			nReset => arst_signal,
			rst    => wb_rst_i,
			irq    => irq,
			IDEctrl_IDEen => IDEctrl_IDEen,
			IDEctrl_rst   => IDEctrl_rst,
			IDEctrl_ppen  => IDEctrl_ppen, 
			IDEctrl_FATR0 => IDEctrl_FATR0,
			IDEctrl_FATR1 => IDEctrl_FATR1,
			a  => wb_adr_i(5 downto 2),
			d  => wb_dat_i,
			we => wb_we_i,
			PIO_cmdport_T1   => PIO_cmdport_T1,
			PIO_cmdport_T2   => PIO_cmdport_T2,
			PIO_cmdport_T4   => PIO_cmdport_T4,
			PIO_cmdport_Teoc => PIO_cmdport_Teoc,
			PIO_cmdport_IORDYen => PIO_cmdport_IORDYen,
			PIO_dport0_T1   => PIO_dport0_T1,
			PIO_dport0_T2   => PIO_dport0_T2,
			PIO_dport0_T4   => PIO_dport0_T4,
			PIO_dport0_Teoc => PIO_dport0_Teoc,
			PIO_dport0_IORDYen => PIO_dport0_IORDYen,
			PIO_dport1_T1   => PIO_dport1_T1,
			PIO_dport1_T2   => PIO_dport1_T2,
			PIO_dport1_T4   => PIO_dport1_T4,
			PIO_dport1_Teoc => PIO_dport1_Teoc,
			PIO_dport1_IORDYen => PIO_dport1_IORDYen,
			PIOsel     => PIOsel,
			PIOack     => PIOack,
			PIOq       => PIOq,
			PIOtip     => PIOtip,
			PIOpp_full => PIOpp_full, 
			DMActrl_DMAen  =>	DMActrl_DMAen,
			DMActrl_dir    => DMActrl_dir,
			DMActrl_BeLeC0 => DMActrl_BeLeC0,
			DMActrl_BeLeC1 => DMActrl_BeLeC1,
			DMA_dev0_Td   => DMA_dev0_Td,
			DMA_dev0_Tm   => DMA_dev0_Tm,
			DMA_dev0_Teoc => DMA_dev0_Teoc,
			DMA_dev1_Td   => DMA_dev1_Td,
			DMA_dev1_Tm   => DMA_dev1_Tm,
			DMA_dev1_Teoc => DMA_dev1_Teoc,
			DMAsel     => DMAsel,
			DMAack     => DMAack,
			DMAq       => DMAq,
			DMAtip     => DMAtip,
			DMA_dmarq  => DMA_dmarq,
			DMATxFull  => DMATxFull, 
			DMARxEmpty => DMARxEmpty,
			DMA_req    => DMA_req,
			DMA_ack    => DMA_ack,
			RESETn => resetn_pad_o,
			DDi    => dd_pad_i,
			DDo    => dd_pad_o,
			DDoe   => dd_padoe_o,
			DA     => da_pad_o,
			CS0n   => cs0n_pad_o,
			CS1n   => cs1n_pad_o,
			DIORn  => diorn_pad_o,
			DIOWn  => diown_pad_o,
			IORDY  => iordy_pad_i,
			INTRQ  => intrq_pad_i,
			DMARQ  => dmarq_pad_i,
			DMACKn => dmackn_pad_o
		);

end architecture structural;