John,
I verified that the IBIS 6.0 parser generate no warnings or errors when an
[Algorithmic Section] (interface to IBIS AMI model) is added to a singled
ended Input, Output or I/O buffer.
On page 171 IBIS 6.1 says:
"The [Algorithmic Model] always processes a single waveform regardless
whether the model is single-ended or differential. When the model is
differential, the waveform passed to the [Algorithmic Model] must be a
difference waveform."
The bottom line is that this is nothing in the IBIS specification that
limits AMI modeling to Inputs, Outputs, I/O, single ended or differential.
There is also no constraint in IBIS that the Impulse Response must start
at zero, and end at zero. A number of tools will generate an impulse
response by differentiating a step response. This will lose any DC offset
in the data, but this is a limitation of the implementation of AMI on that
tool.
IBIS does say that AMI modeling is used for SerDes designs, but does not
limit it as such. It certainly would not hurt to add some language that
AMI modeling can be used for other than SerDes.
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
