You are tasked to design a serial subtractor with accumulator for 6-bit binary numbers. As with most digital systems, negative values will be represented with 2's complement. You should implement your serial subtractor similar to the serial adder with accumulator example that was covered in Lecture 20. You should leave all of the circuitry in that serial adder (including the Full Adder and D-CE FF), but you must insert any number or type of gates to change the design to implement a serial subtractor. Hint: think about what needs to be done when you change the sign (negative or positive) of a 2's compliment binary number.

Paste both the finished block diagram of your design and the state diagram of the operation of its controller.