Multiplier
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13 | signal AU : unsigned(3 downto 0); -- 4 bits
signal BU : unsigned(3 downto 0); -- 4 bits
signal SU : unsigned(7 downto 0); -- 8 bits
signal AS : signed(3 downto 0);
signal BS : signed(3 downto 0);
signal SS : signed(7 downto 0);
signal AI : integer range -16 to 15;
signal BI : integer range -16 to 15;
signal SI : integer range -512 to 511;
--
SU <= AU * BU;
SS <= AS * BS;
SI <= AI * BI;
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The size of the output of a multiplier is equal to the sum of the size of the operands.