4-Bit Adder-Subtractor

Intermediate

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01General Operation

The entity add_sub_4bit has i_a, i_b (slv 3 downto 0), i_sub (std_logic), o_result (slv 3 downto 0), o_carry (std_logic).

4-bit adder/subtractor. If i_sub='0': addition A+B. If i_sub='1': subtraction A-B. o_carry indicates overflow.

02Interface

Signal	Direction	Width	Description
`i_a`	Input	4 bits	Input A
`i_b`	Input	4 bits	Input B
`i_sub`	Input	1 bit	Input Sub
`o_result`	Output	4 bits	Result
`o_carry`	Output	1 bit	Carry out

Chargement…