- added WB TB

git-svn-id: http://moon:8086/svn/vhdl/trunk@1294 cc03376c-175c-47c8-b038-4cd826a8556b
2015-06-11 16:58:46 +00:00
parent ed26cf7449
commit ec40c08234
4 changed files with 375 additions and 0 deletions
@@ -0,0 +1,177 @@
+LIBRARY IEEE;
+USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.NUMERIC_STD.ALL;
+
+LIBRARY WORK;
+USE WORK.spi_types.all;
+
+ENTITY spi_flash_wb IS
+	Generic
+	(
+		FLASH_ADDR_BITS			: natural := 24;
+		CACHE_ADDR_BITS			: natural := 8
+	);
+	Port
+	(
+		CLK_I		: in  STD_LOGIC;
+		RST_I		: in  STD_LOGIC;
+		INT_O		: out STD_LOGIC;
+		CYC_I		: in  STD_LOGIC;
+		STB_I		: in  STD_LOGIC;
+		SEL_I		: in  unsigned(3 downto 0);
+		WE_I		: in  STD_LOGIC;
+		ACK_O		: out STD_LOGIC;
+		SRDY_O		: out STD_LOGIC;
+		MRDY_I		: in  STD_LOGIC;
+		ADDR_I		: in  unsigned(31 downto 0);
+		DAT_I		: in  unsigned(31 downto 0);
+		DAT_O		: out unsigned(31 downto 0);
+		spi_hold	: in std_logic;
+		spi_ss		: out std_logic;
+		spi_clk		: out std_logic;
+		spi_miso	: in std_logic;
+		spi_mosi	: out std_logic
+	);
+END spi_flash_wb;
+
+ARCHITECTURE rtl OF spi_flash_wb IS
+
+	-- Signals for UART connections
+	signal mst_cmd					: cmd_t;
+	signal mst_cmd_vld				: std_logic;
+	signal mst_cmd_rdy				: std_logic;
+	signal mst_shift_en				: std_logic;
+	signal mst_din_vld				: std_logic;
+	signal mst_din_rdy				: std_logic;
+
+	signal mst_ctrl					: ctrl_t;
+	signal mst_status				: status_t;
+	signal mst_din					: unsigned(31 downto 0);
+	signal mst_dout					: unsigned(31 downto 0);
+	signal mst_dout_re				: std_logic;
+	signal mst_dout_vld				: std_logic;
+	signal word_addr				: unsigned(CACHE_ADDR_BITS-1 downto 0);
+	signal tag_reg					: unsigned(FLASH_ADDR_BITS-1 downto CACHE_ADDR_BITS);
+	signal tag_valid				: std_logic;
+	signal tag_match				: std_logic;
+	signal cache_miss				: std_logic;
+	signal register_access			: std_logic;
+	
+begin
+	mst_shift_en 				<= not spi_hold;
+	
+	SRDY_O						<= CYC_I;
+	INT_O						<= '0';
+
+	tag_match					<= '1' when ADDR_I(tag_reg'range) = tag_reg else '0';
+	cache_miss					<= CYC_I and STB_I and not WE_I and not tag_match;
+	register_access				<= CYC_I and STB_I and ADDR_I(FLASH_ADDR_BITS);
+	
+inst_spi_master : entity work.spi_master
+	GENERIC MAP
+	(
+		WORD_WIDTH		=> 32,
+		CAT_FIFO_DEPTH	=> 4,
+		DATA_FIFO_DEPTH	=> 4
+	)
+	PORT MAP
+	(
+		rst			=> RST_I,
+		clk			=> CLK_I,
+		cmd_vld		=> mst_cmd_vld,
+		cmd_rdy		=> mst_cmd_rdy,
+		cmd			=> mst_cmd,
+		din_vld		=> mst_din_vld,
+		din_rdy		=> mst_din_rdy,
+		din			=> mst_din,
+		dout_re		=> mst_dout_re,
+		dout_vld	=> mst_dout_vld,
+		dout		=> mst_dout,
+		shift_en	=> mst_shift_en,
+		mosi		=> spi_mosi,
+		miso		=> spi_miso,
+		sclk		=> spi_clk,
+		mso			=> spi_ss,
+		ctrl		=> mst_ctrl,
+		status		=> mst_status
+		
+	);
+	
+------------------------------------------------------------------
+registers_write: 
+	process(CLK_I)
+	begin
+		if rising_edge(CLK_I) then
+			mst_cmd_vld		<= '0';
+			mst_din_vld		<= '0';
+			if RST_I = '1' then
+				mst_ctrl.clk_div		<= to_unsigned(100, 8);
+				mst_ctrl.cpol			<= '0';
+				mst_ctrl.cpha			<= '0';
+				mst_ctrl.msb_first		<= '1';
+			elsif (register_access and WE_I) = '1' then
+				case ADDR_I(5 downto 2) is
+				
+				when "0000" =>
+					mst_cmd_vld			<= DAT_I(0);
+					
+				when "0001" =>
+					mst_cmd.xfer_size	<= DAT_I;
+
+				when "0010" =>
+					mst_cmd.data_size	<= DAT_I;
+					
+				when "0011" =>
+					mst_din				<= DAT_I;				
+					mst_din_vld			<= '1';
+					
+				when "0100" =>
+					mst_ctrl.clk_div	<= DAT_I(7 downto 0);
+					mst_ctrl.cpol		<= DAT_I(8);
+					mst_ctrl.cpha		<= DAT_I(9);
+					mst_ctrl.msb_first	<= DAT_I(10);
+
+				when others => null;
+				end case;
+			end if;	
+		end if;	
+	end process;
+
+registers_read: 
+	process(CLK_I)
+	begin
+		if rising_edge(CLK_I) then
+			mst_dout_re		<= '0';
+			ACK_O			<= '0';
+			if (register_access) = '1' then
+				ACK_O		<= not WE_I;
+				DAT_O		<= (others => '0');
+				case ADDR_I(5 downto 2) is
+
+				when "0000" =>
+					DAT_O(2 downto 0)	<= mst_dout_vld & mst_din_rdy & mst_cmd_rdy;
+					DAT_O(15 downto 8)	<= spi_hold & mst_status.rx_valid & mst_status.read_fifo_empty & mst_status.read_fifo_full & mst_status.write_fifo_empty & mst_status.write_fifo_full & mst_status.cmd_fifo_empty & mst_status.cmd_fifo_full;
+					
+				when "0001" =>
+					DAT_O				<= mst_cmd.xfer_size;
+
+				when "0010" =>
+					DAT_O				<= mst_cmd.data_size;
+
+				when "0011" =>
+					DAT_O				<= mst_dout;
+					mst_dout_re			<= not WE_I;
+
+				when "0100" =>
+					DAT_O(7 downto 0)	<= mst_ctrl.clk_div;
+					DAT_O(8)			<= mst_ctrl.cpol;
+					DAT_O(9)			<= mst_ctrl.cpha;
+					DAT_O(10)			<= mst_ctrl.msb_first;
+
+				when others => null;
+				end case;
+			end if;
+		end if;	
+	end process;
+
+end rtl;