ustinoff
Member level 2
Hello everyone. I want to use some data from external file in my testbench.
Loading data from file:
Now i need a counter for reading data from signal mem:
r_reg and r_next define as unsigned and of course i can use r_reg signal as address bus.
Stimulus process:
When i simulate the testbench i see next:
1) loading data from file - OK;
2) counting process - OK
But reading from mem is stoped on index "0" (reading from address "0"). Can someone tell me why?
Loading data from file:
Code:
------------------------------------------
--LOADING DATA FROM FILE-----------
------------------------------------------
type signal_storage is array (integer range <>)of std_logic_vector (data_width-1 downto 0);
signal mem : signal_storage (0 to data_storage-1);
procedure Load_ROM (signal data_word :inout signal_storage) is
-- Open File in Read Mode
file romfile :text open read_mode is "signal_record.txt";
variable lbuf :line;
variable i :integer := 0;
variable fdata :std_logic_vector (data_width-1 downto 0);
begin
while not endfile(romfile) loop
-- read digital data from input file
readline(romfile, lbuf);
read(lbuf, fdata);
data_word(i) <= fdata;
i := i+1;
end loop;
end procedure;Now i need a counter for reading data from signal mem:
Code:
address_count :process(i_clk, i_read_en)
begin
if rising_edge(i_clk) then
if i_read_en = '1' then
r_reg <= r_next;
end if;
end if;
end process;
r_next <= (others=>'0') when r_reg = (samples-1) else r_reg + 1;r_reg and r_next define as unsigned and of course i can use r_reg signal as address bus.
Stimulus process:
Code:
stim_proc: process
begin
wait for 100 ns;
i_arst <='1';
wait for 300 ns;
i_arst <='0';
wait for 1000 ns;
i_read_en <='1';
i_data <= mem(to_integer(r_reg));
wait for 6000 ns;
i_read_en <='0';
wait;
assert false report "simulation ended" severity failure;
end process;When i simulate the testbench i see next:
1) loading data from file - OK;
2) counting process - OK
But reading from mem is stoped on index "0" (reading from address "0"). Can someone tell me why?
