Choose the best answer below that describes the flag bits of

Choose the best answer below that describes the flag bits of a 4-bit adder: The overflow and carry-out bit of a full adder will output the same value all the time. The overflow flag bit is only valid when performing unsigned calculations. The negative flag bit is only valid when performing signed calculations. The overflow flag bit is only valid when performing signed calculations. Both b and c Both c and d All of the above None of the above What is an ALU? A software language similar to VHDL A component that can perform any of various arithmetic and logic operations based on control inputs. A type of logic gate Control input that determines whether to add or subtract. None of the above What does the circuit to the right represent? SR latch Flip flop D latch MUX Decoder

Solution

9) answer is D whenever we apply -ve numbers then their addition causes to be a high positive number which causes overflow thus signed numbers get overflow flag.

10) ALU means arithmetic logical unit which can performs arithmetic andlogical operations based on control inputs so answer is B

11) It represents the D latch.

It is also called transperent latch because same output from given input