pocho
Junior Member level 1
I made a testbench, which reads two vectors A and B from files and sends them to an adder which in turn sends me the sum and the carry.
Now I have to calculate the maximum length of the chain propagation of carry-overs (in the code from line 70 to 85), but I get the following errors:
** Error: C :/ test / testbench.vhd (72): No feasible entries for infix operator "/ =".
** Error: C :/ test / testbench.vhd (72): No feasible entries for infix operator "/ =".
** Error: C :/ test / testbench.vhd (72): Bad expression in left operand of infix expression "&".
** Error: C :/ test / testbench.vhd (72): Bad expression in right operand of infix expression "&".
** Error: C :/ test / testbench.vhd (72): Type error resolving infix expression "&" as type std.STANDARD.BOOLEAN.
** Error: C :/ test / testbench.vhd (75): near "=": syntax error
** Error: C :/ test / testbench.vhd (81): near "loop": expecting IF
** Error: C :/ test / testbench.vhd (86): near "elsif": expecting END
this is the code:
please help me
Now I have to calculate the maximum length of the chain propagation of carry-overs (in the code from line 70 to 85), but I get the following errors:
** Error: C :/ test / testbench.vhd (72): No feasible entries for infix operator "/ =".
** Error: C :/ test / testbench.vhd (72): No feasible entries for infix operator "/ =".
** Error: C :/ test / testbench.vhd (72): Bad expression in left operand of infix expression "&".
** Error: C :/ test / testbench.vhd (72): Bad expression in right operand of infix expression "&".
** Error: C :/ test / testbench.vhd (72): Type error resolving infix expression "&" as type std.STANDARD.BOOLEAN.
** Error: C :/ test / testbench.vhd (75): near "=": syntax error
** Error: C :/ test / testbench.vhd (81): near "loop": expecting IF
** Error: C :/ test / testbench.vhd (86): near "elsif": expecting END
this is the code:
Code:
ibrary ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
use IEEE.std_logic_textio.ALL;
use std.textio.all; -- utilizzo del file txt
entity testbench_adder_32bit is
generic (T0: time:= 10 ns;
period: time:= 150 ns);
port (
A, B: out std_logic_vector(31 downto 0) := conv_std_logic_vector(0,32); -- li setto a 0
Cin: out std_logic := '0';
S: in std_logic_vector(31 downto 0) := conv_std_logic_vector(0,32);
Cout: in std_logic := '0'
);
end testbench_adder_32bit;
architecture testbench_carry_select_adder_32bit of testbench_adder_32bit is
type test_vector_type is array (0 to 9) of std_logic_vector (31 downto 0);
signal j: integer := 0;
signal k: integer := 0;
signal c: integer := 0;
signal max_carry_chain: integer := 0;
signal semaforo: integer := 0;
signal reference_clock: std_logic := '0';
signal T0_clock: std_logic := '0';
signal T0_Cout: std_logic := '0';
signal T0_reg: std_logic_vector (31 downto 0) := conv_std_logic_vector(0,32);
signal test_vector_1: test_vector_type;
signal test_vector_2: test_vector_type;
signal test_vector_length: integer := 0;
signal A_carry, B_carry: std_logic_vector(31 downto 0):= conv_std_logic_vector(0,32);
--signal A_carry, B_carry:test_vector_type;
begin
reference_clock <= not reference_clock after period/2.0;
T0_clock <= transport reference_clock after T0;
read_values: process
file fp: text open read_mode is "Addizione.vhd";
variable ln: line;
variable x, y: std_logic_vector (31 downto 0);
variable i: integer := 0;
begin
while not endfile( fp ) loop --fatta modifica Menichelli
readline( fp, ln );
read( ln, x );
read( ln, y );
test_vector_1(i) <= x;
test_vector_2(i) <= y;
i := i+1;
end loop;
test_vector_length <= i;
wait;
end process read_values;
input_generator: process (reference_clock)
begin
if reference_clock'event and reference_clock = '1' then
if j < test_vector_length then
A <= (test_vector_1(j));
B <= (test_vector_2(j));
A_carry <= (test_vector_1(j));
B_carry <= (test_vector_2(j));
j <= j+1;
--------------------------------------------------------------------------------------------
for k in 0 to 31 loop
if ((A_carry(k)/= 0)) & ((B_carry(k)/= 0)) then
semaforo<=1;
c <=c+1;
elsif ((A_carry(k)== 1) or (B_carry(k)== 1)) & semaforo then
c <=c+1;
else
semaforo<=0;
c <=0;
end if;
end loop;
if max_carry_chain < c then
max_carry_chain<=c;
end if;
--------------------------------------------------------------------------------------------
elsif j = test_vector_length then
j <= j+1;
end if;
end if;
end process input_generator;
--output_check: process (reference_clock)
--begin
--if reference_clock'event and reference_clock='1' then
-- ASSERT (S = S_ref ) REPORT "Attenzione uscite diverse!" SEVERITY FAILURE;
-- end if;
--end process output_check;
--output_at_T0: process (T0_clock)
--begin
--if T0_clock'event and T0_clock = '1' then
--T0_reg <= S;
--T0_Cout <= Cout;
--end if;
--end process output_at_T0;
write_result: process( reference_clock )
file fpo: text open write_mode is "test_result.txt";
variable lno: line;
variable xo: bit_vector(31 downto 0);
variable yo: std_logic;
begin
if reference_clock'event and reference_clock = '1' then
if j/=0 and j<=test_vector_length then
xo := to_bitvector( S );
write( lno, xo );
writeline( fpo, lno );
yo := Cout;
write( lno, yo );
writeline( fpo, lno );
end if;
end if;
end process write_result;
end testbench_carry_select_adder_32bit;please help me