[SI-LIST] Re: differential IBIS model generation
- From: "Ken Willis" <kwillis@xxxxxxxxxxx>
- To: <jessica_wuluan@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 11 Nov 2004 09:33:49 -0500
Hi,
I have seen syntax like the following used to define the 100ohm
differential termination in IBIS:
[Pin] signal_name model_name R_pin L_pin C_pin
1 PAD lvds_abc_in NA NA NA
2 PADN lvds_abc_in NA NA NA
|=20
[Series Pin Mapping] pin_2 model_name function_table_group
1 2 rterm_100
|=20
[Diff_pin] inv_pin vdiff tdelay_typ tdelay_min
tdelay_max
|=20
1 2 NA 0 0 0
[Model] rterm_100
Model_type Series
C_comp 0pF 0pF 0pF
[Temperature Range] 25.00 100.00 0.00
[Voltage Range] 2.5 2.5 2.5
|variable R(typ) R(min) R(max)
[R Series] 100 80 120=20
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of jing wu
Sent: Wednesday, November 10, 2004 5:39 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] differential IBIS model generation
SI experts:
=20
I had a question about generating IBIS differential models. I am now
working on generating the LVDS input IBIS buffer model with 100ohm
on-chip-termination resistor. I was told that there is no specification
for creating differential IBIS files. The I-V curve of [ground_clamp]
and [power_clamp] can be generated using the voltage and current on the
input pad, so the I-V curve of [ground_clamp] and [power_clamp] are
identical. It does not make sense to me, if there is no standard to
create differential IBIS file, how the different EDA company create the
differential buffer model in their tools?=20
Thanks much in advance!
=09
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=20
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