(SAIFILE
(SAIFVERSION "2.0")
(DIRECTION "backward")
(DIVIDER / )
(TIMESCALE 1ns)
(DURATION 1000)
 (INSTANCE TOP
  (INSTANCE child
   (INSTANCE grandchild
    (NET
     (clk (T0 500) (T1 500) (TZ 0) (TX 0) (TB 0) (TC 1000))
    )
   )
  )
 )
)