Abstract: Provided is an incrementing/decrementing apparatus that includes an adder having a first input and a second input, each of the first input and the second input comprising multiple bits. A first multi-bit signal is connected to the first input, and a second multi-bit signal is connected to the second input, the second multi-bit signal including multiple bits. The adder increments the first multi-bit signal by a quantity when an increment/decrement signal has a first value and decrements the first multi-bit signal by the quantity when the increment/decrement signal has a second value. The multiple bits of the second multi-bit signal include at least one bit based solely on a corresponding bit in the quantity and at least one bit based solely on a value of the increment/decrement signal.