| Line 56... |
Line 56... |
port(
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port(
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Clock : in std_logic;
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Clock : in std_logic;
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Reset : in std_logic;
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Reset : in std_logic;
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uSec_Tick : out std_logic;
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uSec_Tick : out std_logic;
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--
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--
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Bus_Address : in ADDRESS_TYPE;
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Open8_Bus : in OPEN8_BUS_TYPE;
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Wr_Enable : in std_logic;
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Wr_Data : in DATA_TYPE;
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Rd_Enable : in std_logic;
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Rd_Data : out DATA_TYPE;
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Rd_Data : out DATA_TYPE;
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Interrupt : out std_logic
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Interrupt : out std_logic
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);
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);
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end entity;
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end entity;
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architecture behave of o8_sys_timer is
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architecture behave of o8_sys_timer is
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constant User_Addr : ADDRESS_TYPE := Address;
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constant User_Addr : ADDRESS_TYPE := Address;
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alias Comp_Addr is Bus_Address(15 downto 0);
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alias Comp_Addr is Open8_Bus.Address(15 downto 0);
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signal Addr_Match : std_logic := '0';
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signal Addr_Match : std_logic := '0';
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signal Wr_En : std_logic := '0';
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signal Wr_En : std_logic := '0';
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signal Wr_Data_q : DATA_TYPE := OPEN8_NULLBUS;
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signal Wr_Data_q : DATA_TYPE := x"00";
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signal Rd_En : std_logic := '0';
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signal Rd_En : std_logic := '0';
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signal Rd_En_q : std_logic := '0';
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signal Rd_En_q : std_logic := '0';
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|
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signal Interval : DATA_TYPE := x"00";
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signal Interval : DATA_TYPE := x"00";
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signal Update_Interval : std_logic;
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signal Update_Interval : std_logic;
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| Line 102... |
Line 99... |
Rd_En <= '0';
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Rd_En <= '0';
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Rd_Data <= OPEN8_NULLBUS;
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Rd_Data <= OPEN8_NULLBUS;
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Interval <= x"00";
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Interval <= x"00";
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Update_Interval <= '0';
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Update_Interval <= '0';
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elsif( rising_edge( Clock ) )then
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elsif( rising_edge( Clock ) )then
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Wr_En <= Addr_Match and Wr_Enable;
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Wr_En <= Addr_Match and Open8_Bus.Wr_En;
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Wr_Data_q <= Wr_Data;
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Wr_Data_q <= Open8_Bus.Wr_Data;
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Update_Interval <= '0';
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Update_Interval <= '0';
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if( Wr_En = '1' )then
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if( Wr_En = '1' )then
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Interval <= Wr_Data_q;
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Interval <= Wr_Data_q;
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Update_Interval <= '1';
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Update_Interval <= '1';
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end if;
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end if;
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Rd_Data <= (others => '0');
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Rd_Data <= (others => '0');
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Rd_En <= Addr_Match and Rd_Enable;
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Rd_En <= Addr_Match and Open8_Bus.Rd_En;
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if( Rd_En = '1' )then
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if( Rd_En = '1' )then
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Rd_Data <= Interval;
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Rd_Data <= Interval;
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end if;
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end if;
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end if;
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end if;
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end process;
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end process;
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