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[/] [System09/] [trunk/] [rtl/] [Spartan2/] [sys09b3s.vhd] - Rev 221
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-- -- SYS09BUG Monitor Program -- v1.0 - 21 November 2006 - John Knet -- -- v1.1 - 22 december 2006 - John Kent -- made into 4K ROM/RAM. -- library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; library unisim; use unisim.vcomponents.all; entity mon_rom is Port ( clk : in std_logic; rst : in std_logic; cs : in std_logic; rw : in std_logic; addr : in std_logic_vector (11 downto 0); rdata : out std_logic_vector (7 downto 0); wdata : in std_logic_vector (7 downto 0) ); end mon_rom; architecture rtl of mon_rom is signal we : std_logic; signal cs0 : std_logic; signal cs1 : std_logic; signal dp0 : std_logic; signal dp1 : std_logic; signal rdata0 : std_logic_vector(7 downto 0); signal rdata1 : std_logic_vector(7 downto 0); component SYS09BUG_F000 Port ( clk : in std_logic; rst : in std_logic; cs : in std_logic; rw : in std_logic; addr : in std_logic_vector (10 downto 0); rdata : out std_logic_vector (7 downto 0); wdata : in std_logic_vector (7 downto 0) ); end component; component SYS09BUG_F800 Port ( clk : in std_logic; rst : in std_logic; cs : in std_logic; rw : in std_logic; addr : in std_logic_vector (10 downto 0); rdata : out std_logic_vector (7 downto 0); wdata : in std_logic_vector (7 downto 0) ); end component; begin addr_f000 : SYS09BUG_F000 port map ( clk => clk, rst => rst, cs => cs0, rw => rw, addr => addr(10 downto 0), wdata => wdata, rdata => rdata0 ); addr_f800 : SYS09BUG_F800 port map ( clk => clk, rst => rst, cs => cs1, rw => rw, addr => addr(10 downto 0), wdata => wdata, rdata => rdata1 ); my_mon : process ( rw, addr, cs, rdata0, rdata1 ) begin we <= not rw; case addr(11) is when '0' => cs0 <= cs; cs1 <= '0'; rdata <= rdata0; when '1' => cs0 <= '0'; cs1 <= cs; rdata <= rdata1; when others => null; end case; end process; end architecture rtl;
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