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entity tb_ent6 is
end tb_ent6;
library ieee;
use ieee.std_logic_1164.all;
architecture behav of tb_ent6 is
signal waddr2, raddr2 : natural range 0 to 255;
signal wdat : std_logic_vector (7 downto 0);
signal rdat : std_logic;
signal wen : std_logic;
signal clk : std_logic;
begin
dut: entity work.ent6
generic map (WIDTH => 8)
port map (clk => clk, write_enable => wen,
write_address => waddr2, input => wdat,
read_address => raddr2, output => rdat);
process
procedure pulse is
begin
clk <= '0';
wait for 1 ns;
clk <= '1';
wait for 1 ns;
end pulse;
begin
waddr2 <= 3;
wdat <= x"13";
wen <= '1';
pulse;
waddr2 <= 2;
wdat <= x"ff";
pulse;
raddr2 <= 3;
wen <= '0';
pulse;
assert rdat = '0' severity failure;
raddr2 <= 2;
pulse;
assert rdat = '1' severity failure;
wait;
end process;
end behav;
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