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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;