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-- TEST_START{"inputs": ["input,3,0", "write", "read"], "outputs": ["output,3,0"], "testin": [["0000", 0, 0], ["0000", 0, 1], ["1010", 1, 0], ["0000", 0, 1], ["1100", 1, 1], ["0011", 1, 1]]}TEST_STOP
library ieee;
use ieee.std_logic_1164.all;
entity ex3 is
port (
input: in std_logic_vector(3 downto 0);
write: in std_logic;
read: in std_logic;
output: out std_logic_vector(3 downto 0)
);
end ex3;
architecture impl of ex3 is
signal stuff: std_logic_vector(3 downto 0) := "0000";
begin
output <= stuff when read = '1' else "ZZZZ";
stuff <= input when write = '1' else stuff;
end impl;
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