1 WHEN ((Ack = 1 AND Ack[-1] = 0) OR (Ack = 0 AND Ack[-1] = 1)) 0 OTHERWISE

Buffer < BufferSize

IS1[-1] + 1 WHEN (t067[-1] AND NOT(t021[-1])) 1 WHEN (t067[-1] AND t021[-1]) 0 WHEN (t021[-1]) IS1[-1]

IS1 WHEN (p013) IS2[-1]

IS1 > 0