Use the Logisim to design the circuit.

Create a 4 bit Signed Multiplier with the following specifications:

INPUTS

A	4 bit 2s complement binary number. This could be positive or negative.
B	4 bit 2s complement binary number. This could be positive or negative.

OUTPUT: 8 bit 2s complement binary number (This could be a positive or negative number)

The overall circuit should look like this:

At a minimum, the circuit must be implemented using controlled inverters and an unsigned multiplier as discussed in class:

NOTES

The Controlled Inverters and Unsigned multiplier must be implemented as sub-circuits as demonstrated in class. These sub-circuits are used to build the 2s Complement Signed Multiplier.

You are only allowed to use the basic gates: AND, OR, XOR, NOT.

You are NOT allowed to use Logisims built in circuits (i.e. Adders and Multiplexers). However, you are allowed to use the basic gates to build your own Adders and Multiplexers.

2's Complement Signed Multiplier 2's Complement Signed Multiplier