FreeLists / si-list / [SI-LIST] Hspice problems with [Driver_Schedule] IBIS buffers

[Linnenbruegger Dirk <Dirk.Linnenbruegger@xxxxxxxxxxxxxxxxxxx>]

Hi all,

currently I'm checking an IBIS buffer model which 
uses the [Driver_Schedule] option.

The test load as well as the set up for the buffer 
model seem to be correct. The simulation with 
HSPICE 2002.2 runs without any errors.

b_Drv_io  Drv_nd_pu  Drv_nd_pd  
   +         Drv_out    Drv_in  
   +         Drv_nd_en  Drv_V_out_of_in 
   +         Drv_nd_pc  Drv_nd_gc
+ file     = './drv_sched.ibs'
+ model    = 'drv_sched_model1'
+ buffer   = 6    $ Top Level Model I/O_open_drain buffer 
+ typ      = typ


But now I wonder about the strange waveforms, which have 
been computed at a pulse frequency of 533 MHz. 
The correlation to the reference waveforms is very weak.
However, the IBIS model was generated for 533 MHz!

After a long try-and-error-phase the correlation becomes
better with the following parameter set for the b_Drv_io 
element:

+ fwf_scal=1.1 rwf_scal=0.9
+ pu_scal=0.2

Now my question is: does anyone know a quick and easy 
solution to find a parameter set for good simulation 
results or does anyone else has similar problems?

Thank you, 
Dirk.
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