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[/] [System09/] [tags/] [V10/] [rtl/] [vhdl/] [System09.vhd] - Rev 85
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--===========================================================================---- -- -- S Y N T H E Z I A B L E System09 - SOC. -- -- www.OpenCores.Org - September 2003 -- This core adheres to the GNU public license -- -- File name : System09.vhd -- -- Purpose : Top level file for 6809 compatible system on a chip -- Designed with Xilinx XC2S300e Spartan 2+ FPGA. -- Implemented With BurchED B5-X300 FPGA board, -- B3-SRAM module, B5-CF module and B3-FPGA-CPU-IO module -- -- Dependencies : ieee.Std_Logic_1164 -- ieee.std_logic_unsigned -- ieee.std_logic_arith -- ieee.numeric_std -- -- Uses : boot_rom (sbug.vhd) Monitor ROM -- cpu09 (cpu09.vhd) CPU core -- dat_ram (datram.vhd) Dynamic Address Translation -- miniuart (minitUART2.vhd) ACIA / MiniUART -- (rxunit2.vhd) -- (tx_unit2.vhd) -- (clkunit2.vhd) -- timer (timer.vhd) Timer module -- -- Author : John E. Kent -- dilbert57@opencores.org -- --===========================================================================---- -- -- Revision History: --===========================================================================-- -- Version 0.1 - 20 March 2003 -- Version 0.2 - 30 March 2003 -- Version 0.3 - 29 April 2003 -- Version 0.4 - 29 June 2003 -- Version 0.5 - 19 July 2003 -- prints out "Hello World" -- Version 0.6 - 5 September 2003 -- Runs SBUG -- Version 1.0- 6 Sep 2003 - John Kent -- Inverted SysClk -- Initial release to Open Cores -- --===========================================================================-- library ieee; use ieee.std_logic_1164.all; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; use ieee.numeric_std.all; entity System09 is port( SysClk : in Std_Logic; -- System Clock input Reset_n : in Std_logic; -- Master Reset input (active low) LED : out std_logic; -- Diagnostic LED Flasher -- Memory Interface signals ram_csn : out Std_Logic; ram_wrln : out Std_Logic; ram_wrun : out Std_Logic; ram_addr : out Std_Logic_Vector(16 downto 0); ram_data : inout Std_Logic_Vector(15 downto 0); -- Stuff on the peripheral board -- aux_clock : in Std_Logic; -- FPGA-CPU-IO clock -- PS/2 Mouse interface -- mouse_clock : in Std_Logic; -- mouse_data : in Std_Logic; -- Uart Interface rxbit : in Std_Logic; txbit : out Std_Logic; rts_n : out Std_Logic; cts_n : in Std_Logic; -- CRTC output signals -- v_drive : out Std_Logic; -- h_drive : out Std_Logic; -- blue_lo : out std_logic; -- blue_hi : out std_logic; -- green_lo : out std_logic; -- green_hi : out std_logic; -- red_lo : out std_logic; -- red_hi : out std_logic; -- buzzer : out std_logic; -- Compact Flash cf_rst_n : out std_logic; cf_cs0_n : out std_logic; cf_cs1_n : out std_logic; cf_rd_n : out std_logic; cf_wr_n : out std_logic; cf_cs16_n : out std_logic; cf_a : out std_logic_vector(2 downto 0); cf_d : inout std_logic_vector(15 downto 0); -- Parallel I/O port -- porta : inout std_logic_vector(7 downto 0); -- portb : inout std_logic_vector(7 downto 0); -- timer_out : out std_logic; -- Test Pins test_alu : out std_logic_vector(15 downto 0); test_cc : out std_logic_vector(7 downto 0) ); end System09; ------------------------------------------------------------------------------- -- Architecture for memio Controller Unit ------------------------------------------------------------------------------- architecture my_computer of System09 is ----------------------------------------------------------------------------- -- Signals ----------------------------------------------------------------------------- -- BOOT ROM signal rom_data_out : Std_Logic_Vector(7 downto 0); -- UART Interface signals signal uart_data_out : Std_Logic_Vector(7 downto 0); signal uart_cs : Std_Logic; signal uart_irq : Std_Logic; -- timer -- signal timer_data_out : std_logic_vector(7 downto 0); -- signal timer_cs : std_logic; -- signal timer_irq : std_logic; -- Parallel I/O port -- signal ioport_data_out : std_logic_vector(7 downto 0); -- signal ioport_cs : std_logic; -- compact flash port signal cf_data_out : std_logic_vector(7 downto 0); signal cf_cs : std_logic; signal cf_rd : std_logic; signal cf_wr : std_logic; -- RAM signal ram_cs : std_logic; -- memory chip select signal ram_wrl : std_logic; -- memory write lower signal ram_wru : std_logic; -- memory write upper signal ram_data_out : std_logic_vector(7 downto 0); -- CPU Interface signals signal cpu_reset : Std_Logic; signal cpu_clk : Std_Logic; signal cpu_rw : std_logic; signal cpu_vma : std_logic; signal cpu_halt : std_logic; signal cpu_hold : std_logic; signal cpu_firq : std_logic; signal cpu_irq : std_logic; signal cpu_nmi : std_logic; signal cpu_addr : std_logic_vector(15 downto 0); signal cpu_data_in : std_logic_vector(7 downto 0); signal cpu_data_out: std_logic_vector(7 downto 0); -- Dynamic address translation signal dat_cs : std_logic; signal dat_addr : std_logic_vector(7 downto 0); -- Boot ROM Map switch -- signal map_cs : Std_Logic; -- signal map_sw : Std_Logic; -- synchronous RAM -- signal xram_data_out : std_logic_vector(7 downto 0); -- signal xram_cs : std_logic; -- Flashing Led test signals signal countL : std_logic_vector(23 downto 0); ----------------------------------------------------------------- -- -- CPU09 CPU core -- ----------------------------------------------------------------- component cpu09 port ( clk: in std_logic; rst: in std_logic; rw: out std_logic; -- Asynchronous memory interface vma: out std_logic; address: out std_logic_vector(15 downto 0); data_in: in std_logic_vector(7 downto 0); data_out: out std_logic_vector(7 downto 0); halt: in std_logic; hold: in std_logic; irq: in std_logic; nmi: in std_logic; firq: in std_logic; test_alu: out std_logic_vector(15 downto 0); test_cc: out std_logic_vector(7 downto 0) ); end component; ----------------------------------------------------------------- -- -- Open Cores Mini UART -- ----------------------------------------------------------------- component miniUART port ( SysClk : in Std_Logic; -- System Clock rst : in Std_Logic; -- Reset input cs : in Std_Logic; rw : in Std_Logic; RxD : in Std_Logic; TxD : out Std_Logic; CTS_n : in Std_Logic; RTS_n : out Std_Logic; Irq : out Std_logic; Addr : in Std_Logic; DataIn : in Std_Logic_Vector(7 downto 0); -- DataOut : out Std_Logic_Vector(7 downto 0)); -- end component; ---------------------------------------- -- -- Timer module -- ---------------------------------------- --component timer -- port ( -- clk : in std_logic; -- rst : in std_logic; -- cs : in std_logic; -- rw : in std_logic; -- addr : in std_logic; -- data_in : in std_logic_vector(7 downto 0); -- data_out : out std_logic_vector(7 downto 0); -- irq : out std_logic; -- timer_in : in std_logic; -- timer_out : out std_logic -- ); --end component; ---------------------------------------- -- -- Dual 8 bit Parallel I/O module -- ---------------------------------------- --component ioport -- port ( -- clk : in std_logic; -- rst : in std_logic; -- cs : in std_logic; -- rw : in std_logic; -- addr : in std_logic_vector(1 downto 0); -- data_in : in std_logic_vector(7 downto 0); -- data_out : out std_logic_vector(7 downto 0); -- porta_io : inout std_logic_vector(7 downto 0); -- portb_io : inout std_logic_vector(7 downto 0) -- ); --end component; ---------------------------------------- -- -- SBUG Slice Monitor ROM -- ---------------------------------------- component boot_rom port ( addr : in Std_Logic_Vector(10 downto 0); -- 2K byte boot rom data : out Std_Logic_Vector(7 downto 0)); end component; ---------------------------------------- -- -- SBUG Block RAM Monitor ROM -- ---------------------------------------- --component sbug_rom -- Port ( -- MEMclk : in std_logic; -- MEMaddr : in std_logic_vector (10 downto 0); -- MEMrdata : out std_logic_vector (7 downto 0) -- ); --end component; ---------------------------------------- -- -- Dynamic Address Translation Registers -- ---------------------------------------- component dat_ram port ( clk: in std_logic; rst: in std_logic; cs: in std_logic; rw: in std_logic; addr_lo: in std_logic_vector(3 downto 0); addr_hi: in std_logic_vector(3 downto 0); data_in: in std_logic_vector(7 downto 0); data_out: out std_logic_vector(7 downto 0) ); end component; ---------------------------------------- -- -- Block RAM module -- ---------------------------------------- -- component block_ram -- Port ( -- MEMclk : in std_logic; -- MEMcs : in std_logic; -- MEMrw : in std_logic; -- MEMaddr : in std_logic_vector (10 downto 0); -- MEMrdata : out std_logic_vector (7 downto 0); -- MEMwdata : in std_logic_vector (7 downto 0) -- ); --end component; -- component BUFG -- port ( -- i: in std_logic; -- o: out std_logic -- ); -- end component; begin ----------------------------------------------------------------------------- -- Instantiation of internal components ----------------------------------------------------------------------------- my_cpu : cpu09 port map ( clk => SysClk, rst => cpu_reset, rw => cpu_rw, vma => cpu_vma, address => cpu_addr(15 downto 0), data_in => cpu_data_in, data_out => cpu_data_out, halt => cpu_halt, hold => cpu_hold, irq => cpu_irq, nmi => cpu_nmi, firq => cpu_firq, test_alu => test_alu, test_cc => test_cc ); my_uart : miniUART port map ( SysClk => SysClk, rst => cpu_reset, cs => uart_cs, rw => cpu_rw, RxD => rxbit, TxD => txbit, CTS_n => cts_n, RTS_n => rts_n, Irq => uart_irq, Addr => cpu_addr(0), Datain => cpu_data_out, DataOut => uart_data_out ); --my_timer : timer port map ( -- clk => SysClk, -- rst => cpu_reset, -- cs => timer_cs, -- rw => cpu_rw, -- addr => cpu_addr(0), -- data_in => cpu_data_out, -- data_out => timer_data_out, -- irq => timer_irq, -- timer_in => CountL(5), -- timer_out => timer_out -- ); --my_ioport : ioport port map ( -- clk => SysClk, -- rst => cpu_reset, -- cs => ioport_cs, -- rw => cpu_rw, -- addr => cpu_addr(1 downto 0), -- data_in => cpu_data_out, -- data_out => ioport_data_out, -- porta_io => porta, -- portb_io => portb -- ); my_rom : boot_rom port map ( addr => cpu_addr(10 downto 0), data => rom_data_out ); --my_rom : sbug_rom port map ( -- MEMclk => SysClk, -- MEMaddr => cpu_addr(10 downto 0), -- MEMrdata => rom_data_out -- ); my_dat : dat_ram port map ( clk => SysClk, rst => cpu_reset, cs => dat_cs, rw => cpu_rw, addr_hi => cpu_addr(15 downto 12), addr_lo => cpu_addr(3 downto 0), data_in => cpu_data_out, data_out => dat_addr(7 downto 0) ); --my_ram : block_ram port map ( -- MEMclk => SysClk, -- MEMcs => xram_cs, -- MEMrw => cpu_rw, -- MEMaddr => cpu_addr(10 downto 0), -- MEMwdata => cpu_data_out, -- MEMrdata => xram_data_out -- ); -- clk_buffer : BUFG port map( -- i => e_clk, -- o => cpu_clk -- ); ---------------------------------------------------------------------- -- -- Process to decode memory map -- ---------------------------------------------------------------------- mem_decode: process( SysClk, Reset_n, cpu_addr, cpu_rw, cpu_vma, dat_cs, dat_addr, -- map_cs, map_sw, rom_data_out, ram_data_out, -- xram_data_out, cf_data_out, -- timer_data_out, ioport_data_out, uart_data_out ) begin case cpu_addr(15 downto 11) is -- -- SBUG Monitor ROM $F800 - $FFFF -- when "11111" => -- $F800 - $FFFF cpu_data_in <= rom_data_out; -- read ROM dat_cs <= cpu_vma; -- write DAT ram_cs <= '0'; uart_cs <= '0'; cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- xram_cs <= '0'; -- map_cs <= '0'; -- -- Shadow RAM Monitor switch -- -- when "11101" => -- $E800 - $EFFF -- when "11111" => -- $F800 - $FFFF -- if map_sw = '1' then -- cpu_data_in <= rom_data_out; -- read ROM -- dat_cs <= '0'; -- disable write to DAT -- ram_cs <= cpu_vma; -- enable write to RAM -- else -- cpu_data_in <= ram_data_out; -- read RAM -- dat_cs <= cpu_vma; -- enable write DAT -- ram_cs <= cpu_vma and cpu_rw; -- disable write to RAM -- end if; -- uart_cs <= '0'; -- cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- xram_cs <= cpu_vma; -- map_cs <= '0'; -- -- Synchronous Block RAM $F000 - $F7FF -- -- when "11110" => -- $F000 - $F7FF -- cpu_data_in <= xram_data_out; -- dat_cs <= '0'; -- ram_cs <= '0'; -- uart_cs <= '0'; -- cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- xram_cs <= cpu_vma; -- map_cs <= '0'; -- -- IO Devices $E000 - $E7FF -- when "11100" => -- $E000 - $E7FF dat_cs <= '0'; ram_cs <= '0'; -- xram_cs <= '0'; case cpu_addr(7 downto 4) is -- -- UART / ACIA $E000 -- when "0000" => -- $E000 cpu_data_in <= uart_data_out; uart_cs <= cpu_vma; cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- map_cs <= '0'; -- -- Compact Flash $E010 - $E01F -- when "0001" => -- $E010 cpu_data_in <= cf_data_out; uart_cs <= '0'; cf_cs <= cpu_vma; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- map_cs <= '0'; -- -- Timer $E020 - $E02F -- -- when "0010" => -- $E020 -- cpu_data_in <= timer_data_out; -- uart_cs <= '0'; -- cf_cs <= '0'; -- timer_cs <= cpu_vma; -- ioport_cs <= '0'; -- map_cs <= '0'; -- -- ROM Map switch $E030 -- -- when "0011" => -- $E030 -- cpu_data_in <= "00000000"; -- uart_cs <= '0'; -- cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- map_cs <= cpu_vma; -- -- I/O port $E040 - $E04F -- -- when "0100" => -- $E040 -- cpu_data_in <= ioport_data_out; -- uart_cs <= '0'; -- cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= cpu_vma; -- map_cs <= '0'; when others => -- $E040 to $E7FF cpu_data_in <= "00000000"; uart_cs <= '0'; cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- map_cs <= '0'; end case; -- -- Everything else is RAM -- when others => cpu_data_in <= ram_data_out; ram_cs <= cpu_vma; dat_cs <= '0'; uart_cs <= '0'; cf_cs <= '0'; -- timer_cs <= '0'; -- ioport_cs <= '0'; -- xram_cs <= '0'; -- map_cs <= '0'; end case; end process; -- -- B3-SRAM Control -- Processes to read and write memory based on bus signals -- ram_process: process( SysClk, Reset_n, cpu_addr, cpu_rw, cpu_vma, cpu_data_out, dat_addr, ram_cs, ram_wrl, ram_wru, ram_data_out ) begin ram_csn <= not( ram_cs and Reset_n ); ram_wrl <= (not dat_addr(5)) and (not cpu_rw) and SysClk; ram_wrln <= not (ram_wrl); ram_wru <= dat_addr(5) and (not cpu_rw) and SysClk; ram_wrun <= not (ram_wru); ram_addr(16 downto 12) <= dat_addr(4 downto 0); ram_addr(11 downto 0) <= cpu_addr(11 downto 0); if ram_wrl = '1' then ram_data(7 downto 0) <= cpu_data_out; else ram_data(7 downto 0) <= "ZZZZZZZZ"; end if; if ram_wru = '1' then ram_data(15 downto 8) <= cpu_data_out; else ram_data(15 downto 8) <= "ZZZZZZZZ"; end if; if dat_addr(5) = '1' then ram_data_out <= ram_data(15 downto 8); else ram_data_out <= ram_data(7 downto 0); end if; end process; -- -- Compact Flash Control -- compact_flash: process( SysClk, Reset_n, cpu_addr, cpu_rw, cpu_vma, cpu_data_out, cf_cs, cf_rd, cf_wr, cf_data_out ) begin cf_rst_n <= Reset_n; cf_cs0_n <= not( cf_cs ) or cpu_addr(3); cf_cs1_n <= not( cf_cs and cpu_addr(3)); cf_cs16_n <= '1'; cf_wr <= cf_cs and (not cpu_rw); cf_rd <= cf_cs and cpu_rw; cf_wr_n <= not cf_wr; cf_rd_n <= not cf_rd; cf_a <= cpu_addr(2 downto 0); if cf_wr = '1' then cf_d(7 downto 0) <= cpu_data_out; else cf_d(7 downto 0) <= "ZZZZZZZZ"; end if; cf_data_out <= cf_d(7 downto 0); cf_d(15 downto 8) <= "ZZZZZZZZ"; end process; -- -- ROM Map switch -- The Map switch output is initially set -- On a Write to the Map Switch port, clear the Map Switch -- and map the RAM in place of the boot ROM. -- --map_proc : process( SysClk, Reset_n, map_cs, cpu_rw ) --begin -- if SysClk'event and SysClk = '0' then -- if Reset_n = '0' then -- map_sw <= '1'; -- else -- if (map_cs = '1') and (cpu_rw = '0') then -- map_sw <= '0'; -- else -- map_sw <= map_sw; -- end if; -- end if; -- end if; --end process; -- -- Interrupts and other bus control signals -- interrupts : process( Reset_n, uart_irq -- ,timer_irq ) begin cpu_reset <= not Reset_n; -- CPU reset is active high cpu_irq <= uart_irq; -- cpu_nmi <= timer_irq; cpu_nmi <= '0'; cpu_firq <= '0'; cpu_halt <= '0'; cpu_hold <= '0'; end process; -- -- flash led to indicate code is working -- increment: process (SysClk, CountL ) begin if(SysClk'event and SysClk = '0') then countL <= countL + 1; end if; LED <= countL(21); end process; end my_computer; --===================== End of architecture =======================--
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