entity in_pad is
port ( i : in bit; z : out bit );
end entity in_pad;
entity reg32 is
port ( en : in bit; clk : in bit; d : in bit_vector(31 downto 0);
q : out bit_vector(31 downto 0) );
end entity reg32;
entity adder is
port ( a, b : in bit_vector(31 downto 0);
y : out bit_vector(31 downto 0);
c : out bit );
end entity adder;
entity filter is
end entity filter;
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