Introduction - If you have any usage issues, please Google them yourself
With the VHDL language to describe the design and realization of multiplier-accumulator, four of multiplicand X and 4-bit multiplier Y input, the temporary 4-bit registers in the register A and B, registers A and B multiplied by the output of the first, to be 8-bit product, the product further with the 8-bit output of register C, the sum of, the sum of the results stored in register C,. The output register C is also the system output Z. (Original, which are multiply and accumulate some part may be raised separately, very good use)