# 11 -> x⁰ + x¹ boxwid = 0.5in; boxht = 0.5in; # Shift register and XOR taps right Start: arrow "" "x⁰" big big box "1" big big # Input arrow "" "x¹" big big Input: circle "+" big big arrow <- from Input.s down line left "Input" big big "" # Feedback network FB: line from Input.n up \ then left until even with Start.start \ then to Start.start