Then we end the entity using the end keyword. In the above code “multiply” is the name of the entity and in ports, we have created two input ports of 2-bit each using A, B : bit_vector(1 downto 0) this creates two bit_vector having bits A(0), A(1) and B(0), B(1) and a 4-bit output port using P: out bit_vector(3 downto 0) having bits P(0), P(1), P(2), P(3). library ieee Īfter including the library, we need to define an entity in which we define our input and output ports of the circuit. ![]() So let’s start writing a VHDL program using dataflow modeling.Īs we have been doing from the start of this VHDL course, in the beginning, we have to include the IEEE library and use its standard logic library. ![]() P(3) <= ((A(1) AND B(0)) AND (A(0) AND B(1))) AND (A(1) AND B(1)) Circuit diagram The logic circuit of a 2-bit multiplier Dataflow ModelingĪs we know that in the dataflow modeling style, we describe the flow of data through every gate using equations.
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