While adders may accept the two$$s complement representation of a negative number and generate the cor$-$ rect result, this does not apply to multipliers: they will always treat their input as an unsigned number. For the multiplier to accept a negative number, we need to convert the number to its signed magnitude representation.

In this experiment, you will be provided with a template circuit in Digital which uses the built$-$in multiplier block to calculate the product of two numbers. While the lower row takes both numbers as unsigned, the circuit is expected to treat the $2$nd argument of the upper row as a signed number. To do this, a block named abs is inserted into the signal path, which is expected to calculate the absolute value and the sign of its input. A sample run is show in the figure: