; enable generation of expected output vectors and comparison result waveforms. 
output_wf 1 
; radix specifies the number of bit of the vector. 
radix 1
; io defines the vector as an input or output vector. 
io    i 
; vname assigns the name to the vector. 
vname B30 
; tunit sets the time unit. 
tunit ns 
; trise specifies the rise time of each input vector. 
trise 10 
; tfall specifies the fall time of each input vector. 
tfall 10 
; vih specifies the logic high voltage of each input vector. 
vih 5
; vil specifies the logic low voltage of each input vector 
vil -6 
; voh specifies the logic high voltage of each output vector 
voh 5.0 
; vol specifies the logic low voltage of each output vector 
vol -6
0 0 
999 0
1000 1 
7000 1