Subversion Repositories hf-risc

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_textio.all;

use ieee.std_logic_unsigned.all;

use std.textio.all;

use ieee.numeric_std.all;

entity tb is

        generic(

                address_width: integer := 16;

                memory_file : string := "code.txt";

                log_file: string := "out.txt";

                uart_support : string := "no"

        );

end tb;

architecture tb of tb is

        signal clock_in, reset, stall_cpu, data, stall, stall_sig: std_logic := '0';

        signal uart_read, uart_write: std_logic;

        signal boot_enable_n, ram_enable_n, irq_cpu, irq_ack_cpu, exception_cpu, data_access_cpu, ram_dly: std_logic;

        signal address, data_read, data_write, data_read_boot, data_read_ram, irq_vector_cpu, address_cpu, data_in_cpu, data_out_cpu: std_logic_vector(31 downto 0);

        signal ext_irq: std_logic_vector(7 downto 0);

        signal data_we, data_w_n_ram, data_w_cpu: std_logic_vector(3 downto 0);

begin

        process                                         --25Mhz system clock

        begin

                clock_in <= not clock_in;

                wait for 20 ns;

                clock_in <= not clock_in;

                wait for 20 ns;

        end process;

        process

        begin

                stall <= not stall;

                wait for 123 ns;

                stall <= not stall;

                wait for 123 ns;

        end process;

        reset <= '0', '1' after 5 ns, '0' after 500 ns;

        stall_sig <= '0'; --stall;

        ext_irq <= x"00";

        uart_read <= '1';

        boot_enable_n <= '0' when (address(31 downto 28) = "0000" and stall_cpu = '0') or reset = '1' else '1';

        ram_enable_n <= '0' when (address(31 downto 28) = "0100" and stall_cpu = '0') or reset = '1' else '1';

        data_read <= data_read_boot when address(31 downto 28) = "0000" and ram_dly = '0' else data_read_ram;

        data_w_n_ram <= not data_we;

        process(clock_in, reset)

        begin

                if reset = '1' then

                        ram_dly <= '0';

                elsif clock_in'event and clock_in = '1' then

                        ram_dly <= not ram_enable_n;

                end if;

        end process;

        -- HF-RISC core

        core: entity work.datapath

        port map(       clock => clock_in,

                        reset => reset,

                        stall => stall_cpu,

                        irq_vector => irq_vector_cpu,

                        irq => irq_cpu,

                        irq_ack => irq_ack_cpu,

                        exception => exception_cpu,

                        address => address_cpu,

                        data_in => data_in_cpu,

                        data_out => data_out_cpu,

                        data_w => data_w_cpu,

                        data_access => data_access_cpu

        );

        -- peripherals / busmux logic

        peripherals_busmux: entity work.busmux

        generic map(

                log_file => log_file,

                uart_support => uart_support

        )

        port map(

                clock => clock_in,

                reset => reset,

                stall => stall_sig,

                stall_cpu => stall_cpu,

                irq_vector_cpu => irq_vector_cpu,

                irq_cpu => irq_cpu,

                irq_ack_cpu => irq_ack_cpu,

                exception_cpu => exception_cpu,

                address_cpu => address_cpu,

                data_in_cpu => data_in_cpu,

                data_out_cpu => data_out_cpu,

                data_w_cpu => data_w_cpu,

                data_access_cpu => data_access_cpu,

                addr_mem => address,

                data_read_mem => data_read,

                data_write_mem => data_write,

                data_we_mem => data_we,

                extio_in => ext_irq,

                extio_out => open,

                uart_read => uart_read,

                uart_write => uart_write

        );

        -- boot ROM

        boot0lb: entity work.boot_ram

        generic map (   memory_file => "boot.txt",

                                        data_width => 8,

                                        address_width => 12,

                                        bank => 0)

        port map(

                clk     => clock_in,

                addr    => address(11 downto 2),

                cs_n    => boot_enable_n,

                we_n    => '1',

                data_i  => (others => '0'),

                data_o  => data_read_boot(7 downto 0)

        );

        boot0ub: entity work.boot_ram

        generic map (   memory_file => "boot.txt",

                                        data_width => 8,

                                        address_width => 12,

                                        bank => 1)

        port map(

                clk     => clock_in,

                addr    => address(11 downto 2),

                cs_n    => boot_enable_n,

                we_n    => '1',

                data_i  => (others => '0'),

                data_o  => data_read_boot(15 downto 8)

        );

        boot1lb: entity work.boot_ram

        generic map (   memory_file => "boot.txt",

                                        data_width => 8,

                                        address_width => 12,

                                        bank => 2)

        port map(

                clk     => clock_in,

                addr    => address(11 downto 2),

                cs_n    => boot_enable_n,

                we_n    => '1',

                data_i  => (others => '0'),

                data_o  => data_read_boot(23 downto 16)

        );

        boot1ub: entity work.boot_ram

        generic map (   memory_file => "boot.txt",

                                        data_width => 8,

                                        address_width => 12,

                                        bank => 3)

        port map(

                clk     => clock_in,

                addr    => address(11 downto 2),

                cs_n    => boot_enable_n,

                we_n    => '1',

                data_i  => (others => '0'),

                data_o  => data_read_boot(31 downto 24)

        );

        -- RAM

        memory0lb: entity work.bram

        generic map (   memory_file => memory_file,

                                        data_width => 8,

                                        address_width => address_width,

                                        bank => 0)

        port map(

                clk     => clock_in,

                addr    => address(address_width -1 downto 2),

                cs_n    => ram_enable_n,

                we_n    => data_w_n_ram(0),

                data_i  => data_write(7 downto 0),

                data_o  => data_read_ram(7 downto 0)

        );

        memory0ub: entity work.bram

        generic map (   memory_file => memory_file,

                                        data_width => 8,

                                        address_width => address_width,

                                        bank => 1)

        port map(

                clk     => clock_in,

                addr    => address(address_width -1 downto 2),

                cs_n    => ram_enable_n,

                we_n    => data_w_n_ram(1),

                data_i  => data_write(15 downto 8),

                data_o  => data_read_ram(15 downto 8)

        );

        memory1lb: entity work.bram

        generic map (   memory_file => memory_file,

                                        data_width => 8,

                                        address_width => address_width,

                                        bank => 2)

        port map(

                clk     => clock_in,

                addr    => address(address_width -1 downto 2),

                cs_n    => ram_enable_n,

                we_n    => data_w_n_ram(2),

                data_i  => data_write(23 downto 16),

                data_o  => data_read_ram(23 downto 16)

        );

        memory1ub: entity work.bram

        generic map (   memory_file => memory_file,

                                        data_width => 8,

                                        address_width => address_width,

                                        bank => 3)

        port map(

                clk     => clock_in,

                addr    => address(address_width -1 downto 2),

                cs_n    => ram_enable_n,

                we_n    => data_w_n_ram(3),

                data_i  => data_write(31 downto 24),

                data_o  => data_read_ram(31 downto 24)

        );

        -- debug process

        debug:

        if uart_support = "no" generate

                process(clock_in, address_cpu)

                        file store_file : text open write_mode is "debug.txt";

                        variable hex_file_line : line;

                        variable c : character;

                        variable index : natural;

                        variable line_length : natural := 0;

                begin

                        if clock_in'event and clock_in = '1' then

                                if address_cpu = x"f00000d0" and data = '0' then

                                        data <= '1';

                                        index := conv_integer(data_write(30 downto 24));

                                        if index /= 10 then

                                                c := character'val(index);

                                                write(hex_file_line, c);

                                                line_length := line_length + 1;

                                        end if;

                                        if index = 10 or line_length >= 72 then

                                                writeline(store_file, hex_file_line);

                                                line_length := 0;

                                        end if;

                                else

                                        data <= '0';

                                end if;

                        end if;

                end process;

        end generate;

        process(clock_in, reset, address)

        begin

                if reset = '1' then

                elsif clock_in'event and clock_in = '0' then

                        assert address /= x"e0000000" report "end of simulation" severity failure;

                        assert (address < x"50000000") or (address >= x"f0000000") report "out of memory region" severity failure;

                        assert address /= x"40000100" report "handling IRQ" severity warning;

                end if;

        end process;

end tb;