[SI-LIST] Hspice problems with [Driver_Schedule] IBIS buffers
- From: Linnenbruegger Dirk <Dirk.Linnenbruegger@xxxxxxxxxxxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 6 Nov 2002 15:08:59 +0100
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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