module MarkSpaceTimer (clock, rawInput, eventType, eventDuration, newEvent);

    input  clock;				// 20 µs (50 KHz) clock
    input  rawInput;				// Raw Morse code signal
    output eventType;				// MARK (1) or SPACE (0)
    output eventDuration;			// Length of mark or space, in
						//  20 µs units
    output newEvent;				// Pulsed once for each event