N-bit Adder — Ripple Carry

Intermediate

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01General Operation

Configurable-width adder (g_width bits) with carry-in and carry-out. Implements bit-by-bit carry propagation (ripple carry). Purely combinational circuit.

Generic g_width (default 4)
Use only ieee.std_logic_1164, not numeric_std

02Interface

Signal	Direction	Width	Description
`i_a`	Input	g_width bits	Operand A
`i_b`	Input	g_width bits	Operand B
`i_cin`	Input	1 bit	Carry in
`o_sum`	Output	g_width bits	Sum result
`o_cout`	Output	1 bit	Carry out

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