A system (100, 200, 300) for delivering neurostimulation to a body having a nerve including A-fibers and B-fibers each corresponding to one type of nerve fibers, the system comprising: a stimulation output circuit configured to deliver neurostimulation pulses to the nerve; a neural sensing circuit configured to sense a neural signal representative of neural activities in the nerve including evoked neural responses each evoked by one of the neurostimulation pulses; and an evoked neural response detection circuit configured to detect the evoked neural responses using the neural signal, the evoked neural response detection circuit including: a detection timer configured to time a delay interval, a first detection window, and a second detection window in response to delivery of one of the neurostimulation pulses, the delay interval starting upon the delivery of the one of the stimulation pulses, the first detection window starting upon expiration of the delay interval, the second detection window starting upon expiration of the first detection window; and a comparator configured to detect an evoked A-fiber response of the evoked neural responses by comparing the sensed neural signal to a first detection threshold during the first detection window and detect an evoked B-fiber response of the evoked neural responses by comparing the sensed neural signal to a second detection threshold during the second detection window. a stimulation output circuit configured to deliver neurostimulation pulses to the nerve; a neural sensing circuit configured to sense a neural signal representative of neural activities in the nerve including evoked neural responses each evoked by one of the neurostimulation pulses; and an evoked neural response detection circuit configured to detect the evoked neural responses using the neural signal, the evoked neural response detection circuit including: a detection timer configured to time a delay interval, a first detection window, and a second detection window in response to delivery of one of the neurostimulation pulses, the delay interval starting upon the delivery of the one of the stimulation pulses, the first detection window starting upon expiration of the delay interval, the second detection window starting upon expiration of the first detection window; and a comparator configured to detect an evoked A-fiber response of the evoked neural responses by comparing the sensed neural signal to a first detection threshold during the first detection window and detect an evoked B-fiber response of the evoked neural responses by comparing the sensed neural signal to a second detection threshold during the second detection window. a detection timer configured to time a delay interval, a first detection window, and a second detection window in response to delivery of one of the neurostimulation pulses, the delay interval starting upon the delivery of the one of the stimulation pulses, the first detection window starting upon expiration of the delay interval, the second detection window starting upon expiration of the first detection window; and a comparator configured to detect an evoked A-fiber response of the evoked neural responses by comparing the sensed neural signal to a first detection threshold during the first detection window and detect an evoked B-fiber response of the evoked neural responses by comparing the sensed neural signal to a second detection threshold during the second detection window.