Unsigned 8 Bit Multiplier Data Path (Entity)

LIBRARY work;

LIBRARY gate_lib;

USE gate_lib.resources.all;

ENTITY mult_datapath IS

PORT(multiplicand : IN level_vector(7 DOWNTO 0);

multiplier : IN level_vector(7 DOWNTO 0);

a_enable : IN level; -- clock enable for A register

a_reset : IN level; -- Reset control for A register

a_mode : IN level; -- Shift or load mode for A

c_enable : IN level; -- clock enable for c register

m_enable : IN level; -- clock enable for M register

q_enable : IN level; -- clock enable for Q register

q_mode : IN level; -- Shift or load mode for Q

clk : IN level;

product : OUT level_vector(15 DOWNTO 0));

END mult_datapath;

Multiplier

n-Bit Adder

Control

Unit

Product

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The final example is of an RTL level datapath for an unsigned 8 bit multiplier. It illustrates the use of complex components in a structural description and the use of multiple levels of hierarchy in that the components are themselves structural descriptions of lower level components. This is the entity description for the datapath. The register controls (enable, mode) will go to the control unit when it is added.