diff --git a/tb/envm_sim.vhd b/tb/envm_sim.vhd
new file mode 100644
index 0000000000000000000000000000000000000000..14f328e5d9b9fb71b6583bf4571f5d8d51af0fe3
--- /dev/null
+++ b/tb/envm_sim.vhd
@@ -0,0 +1,76 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+library work;
+package envm_sim_pkg is
+ type stdvector_array is array (natural range <>) of std_logic_vector (31 downto 0);
+end package;
+use work.envm_sim_pkg.all;
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+
+entity envm_sim is
+ generic (
+
+ g_bootldr_text_offset : std_logic_vector (31 downto 0);
+
+
+ g_app_text_offset : std_logic_vector (31 downto 0);
+
+
+ g_app_data_offset : std_logic_vector (31 downto 0)
+ );
+ port (
+ clk_i : in std_logic;
+ rst_i : in std_logic;
+
+
+ bootldr_text_image_i : stdvector_array;
+ app_text_image_i : stdvector_array;
+ app_data_image_i : stdvector_array;
+
+ apb_psel_i : in std_logic;
+ apb_pwr_i : in std_logic;
+ apb_pen_i : in std_logic;
+ apb_paddr_i : in std_logic_vector(31 downto 0);
+ apb_pwdat_i : in std_logic_vector(31 downto 0);
+ apb_prdat_o : out std_logic_vector(31 downto 0);
+ apb_pready_o : out std_logic; --
+ apb_pslverr_o : out std_logic
+ );
+
+ end entity envm_sim;
+
+
+architecture rtl of envm_sim is
+
+begin
+
+ process (clk_i)
+ begin
+ if rising_edge (clk_i) then
+ apb_prdat_o <= (others => '0');
+ apb_pready_o <= '0';
+ if (apb_psel_i = '1' and apb_pen_i = '1') then
+ apb_pready_o <= '1';
+ if (apb_paddr_i (31 downto 16) = g_app_text_offset (31 downto 16)) then
+ apb_prdat_o <= app_text_image_i (to_integer(unsigned(apb_paddr_i(31 downto 2))) - to_integer(unsigned(g_app_text_offset(31 downto 2))));
+ elsif (apb_paddr_i (31 downto 16) = g_app_data_offset (31 downto 16)) then
+ apb_prdat_o <= app_data_image_i(to_integer(unsigned(apb_paddr_i(31 downto 2))) - to_integer(unsigned(g_app_data_offset(31 downto 2))));
+ elsif (apb_paddr_i (31 downto 16) = g_bootldr_text_offset (31 downto 16)) then
+ apb_prdat_o <= bootldr_text_image_i(to_integer(unsigned(apb_paddr_i (31 downto 2))) - to_integer(unsigned(g_bootldr_text_offset(31 downto 2))));
+ elsif (apb_paddr_i = x"60080120") then -- busy bit check
+ apb_prdat_o <= x"00000001";
+-- else
+-- report "invalid address" severity failure;
+ end if;
+ end if;
+end if;
+end process;
+
+
+end architecture;
\ No newline at end of file
diff --git a/tb/urv_tb.vhd b/tb/urv_tb.vhd
new file mode 100644
index 0000000000000000000000000000000000000000..930382c84227923709ae9ca6a49702972a3164ae
--- /dev/null
+++ b/tb/urv_tb.vhd
@@ -0,0 +1,310 @@
+
+
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+use std.textio.all;
+use ieee.math_real.all;
+use work.envm_sim_pkg.all;
+
+entity urv_tb is
+end urv_tb;
+
+architecture behav of urv_tb is
+
+
+
+
+
+
+
+ signal clk, clk_mac : std_logic;
+ signal rst : std_logic;
+ signal rst_cpu : std_logic;
+
+ signal tx_data : std_logic_vector (3 downto 0);
+
+
+ signal apb_psel : std_logic;
+signal apb_pwr : std_logic;
+signal apb_pen : std_logic;
+signal apb_paddr : std_logic_vector(31 downto 0);
+signal apb_pwdat : std_logic_vector(31 downto 0);
+signal apb_prdat : std_logic_vector(31 downto 0);
+signal apb_pready : std_logic; --
+
+signal bootldr_text: stdvector_array (0 to 1024*64 - 1);
+signal app_text: stdvector_array (0 to 1024*64 - 1);
+signal app_data: stdvector_array (0 to 1024*64 - 1);
+
+
+ signal eth_tx_en : std_logic;
+ signal uart_tx : std_logic;
+ signal uart_tx_ecc : std_logic;
+ signal rx_d : std_logic_vector (3 downto 0);
+ signal rx_dv: std_logic;
+ subtype word_t is std_logic_vector(31 downto 0);
+ type word_array is array (natural range <>) of word_t;
+ type nibble_array is array (natural range <>) of std_logic_vector (3 downto 0);
+
+ signal clk_mac_rx, clk_mac_tx : std_logic;
+
+ signal lock_a,lock_b, grant_a, grant_b : std_logic;
+ signal aa,ab : std_logic_vector (15 downto 0);
+constant frame : nibble_array := (x"f", x"f", x"f", x"f", x"f", x"f",x"f", x"f", x"f", x"f", x"f", x"f",x"0",x"a",x"0",x"0",x"3",x"0",x"b",x"5",x"2",x"8",x"0",x"1",x"0",x"8",x"0",x"6",x"0",x"0",x"0",x"1",x"0",x"8",x"0",x"0",x"0",x"6",x"0",x"4",x"0",x"0",x"0",x"1",x"0",x"a",x"0",x"0",x"3",x"0",x"b",x"5",x"2",x"8",x"0",x"1",x"8",x"0",x"8",x"d",x"a",x"2",x"0",x"1",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"8",x"0",x"8",x"d",x"a",x"2",x"f",x"c",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"0",x"8",x"1",x"5",x"2",x"1",x"e",x"d",x"c");
+
+ signal error_size, eth_tx_en_d : std_logic;
+ signal count_nibble : integer range 0 to 1023;
+
+ procedure read_binary(filename : string; data : out stdvector_array)
+ is
+ type char_file is file of character;
+ file f : char_file;
+ variable c : character;
+ variable b : std_logic_vector(7 downto 0);
+ variable w : std_logic_vector (31 downto 0);
+ variable addr : natural;
+ begin
+ data := (data'range => (others => '0'));
+ file_open(f, filename, READ_MODE);
+ addr := data'left;
+
+ while not endfile(f) loop
+ for i in 0 to 3 loop
+ read(f, c);
+ b := std_logic_vector(to_unsigned(character'pos(c), 8));
+ w (8*i + 7 downto 8*i) := b;
+ end loop;
+ data(addr) := w;
+ addr := addr + 1;
+ --report to_hstring(w) severity note;
+ end loop;
+ file_close(f);
+ end read_binary;
+
+
+
+
+begin
+
+
+envm_simulated : entity work.envm_sim
+ generic map (
+
+ g_bootldr_text_offset => x"60012000",
+ g_app_text_offset => x"60000000",
+ g_app_data_offset => x"60020000"
+ )
+ port map (
+ clk_i => clk,
+ rst_i => rst,
+
+
+ bootldr_text_image_i => bootldr_text,
+ app_text_image_i => app_text,
+ app_data_image_i => app_data,
+
+ apb_psel_i => apb_psel,
+ apb_pwr_i => apb_pwr,
+ apb_pen_i => apb_pen,
+ apb_paddr_i => apb_paddr,
+ apb_pwdat_i => apb_pwdat,
+ apb_prdat_o => apb_prdat,
+ apb_pready_o => apb_pready
+ );
+
+ soc: entity work.urv_soc
+ port map (
+ clk_i => clk,
+ clk_ram_i => (others => clk),
+
+ rst_i => rst,
+
+
+ apb_psel_o => apb_psel,
+ apb_pwr_o => apb_pwr,
+ apb_pen_o => apb_pen,
+ apb_paddr_o => apb_paddr,
+ apb_pwdat_o => apb_pwdat,
+ apb_prdat_i => apb_prdat,
+ apb_pready_i => apb_pready,
+
+
+ apb_pslverr_i => '0',
+
+
+ uart_tx_o => uart_tx,
+ eth_tx_clk_i => clk_mac_TX,
+ eth_rx_clk_i => clk_mac_RX,
+ eth_rxd_i => rx_d,
+ eth_txd_o => tx_data,
+ eth_rxdv_i => rx_dv,
+ eth_rxerr_i => '0',
+ eth_md_i => '0',
+ eth_txen_o => eth_tx_en,
+ devrst_i => rst
+
+ -- irq_i => irq
+
+ );
+
+
+
+
+
+
+
+ process
+ begin
+ clk <= '0';
+ wait for 10 ns;
+ clk <= '1';
+ wait for 10 ns;
+ end process;
+
+
+
+ process
+ begin
+ wait for 10ns;
+ loop
+ clk_mac_RX <= '0';
+ wait for 19.347654 ns;
+ clk_mac_RX <= '1';
+ wait for 19.24667 ns;
+ end loop;
+ end process;
+
+ process
+ begin
+ loop
+ clk_mac_TX <= '0';
+ wait for 19.1 ns;
+ clk_mac_TX <= '1';
+ wait for 19.1 ns;
+ end loop;
+ end process;
+
+ process
+ variable data : stdvector_array(0 to 1024*64 - 1);
+
+
+ -- variable i : integer;
+ begin
+
+
+
+
+
+ rst <= '1';
+
+ read_binary ("bootldr.bin", data);
+ bootldr_text <= data;
+ read_binary ("app_text.bin", data);
+ app_text <= data;
+ read_binary ("app_data.bin", data);
+ app_data <= data;
+
+ wait for 1ms;
+ rst <= '0';
+
+
+
+ --write_memory(arm_iram_psel, arm_iram_pwr, arm_iram_pen, arm_iram_paddr, arm_iram_pwdat, arm_iram_pready, mem_code);
+
+
+
+ --write_memory(arm_iram_bank1_psel, arm_iram_bank1_pwr, arm_iram_bank1_pen, arm_iram_bank1_paddr, arm_iram_bank1_pwdat, arm_iram_bank1_pready, mem_code);
+
+
+ --write_memory(arm_dram_psel, arm_dram_pwr, arm_dram_pen, arm_dram_paddr, arm_dram_pwdat, arm_dram_pready, mem_data);
+
+ wait until rising_edge(clk);
+
+ report "Starting CPU" severity note;
+
+ rst_cpu <= '0';
+
+ wait for 1 ms;
+
+ loop
+ wait for 10000 ns;
+ --read_memory(144, arm_dram_psel, arm_dram_pwr, arm_dram_pen, arm_dram_paddr, arm_dram_prdat, arm_dram_pready);
+ end loop;
+
+ wait;
+ end process;
+
+
+
+process
+
+begin
+
+
+ wait until rising_edge(clk);
+ --secded ecc
+ wait until rising_edge(clk);
+ wait for 1ms;
+ --secded ecc
+
+rx_dv <= '0';
+rx_d <= x"0";
+
+wait for 9 ms;
+
+for k in 1 to 10000 loop
+wait for 205 ms;
+
+for i in 1 to 15 loop
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= x"5";
+ rx_dv <= '1';
+end loop;
+
+wait until rising_edge(clk_mac_rx);
+rx_d <= x"D";
+
+
+for i in 1 to (frame'length/2) loop
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-1);
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-2);
+end loop;
+
+for i in 1 to (frame'length/2) loop
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-1);
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-2);
+end loop;
+
+for i in 1 to (frame'length/2) loop
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-1);
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-2);
+end loop;
+
+for i in 1 to (frame'length/2) loop
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-1);
+ wait until rising_edge(clk_mac_rx);
+ rx_d <= frame(2*i-2);
+end loop;
+
+wait until rising_edge(clk_mac_rx);
+rx_d <= x"0";
+rx_dv <= '0';
+end loop;
+
+
+end process;
+
+
+
+
+
+end behav;