Hi Walter,
Sorry for not replying to you e-mail. You correctly summarized what we agreed
to.
Thanks,
Radek
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] ;
On Behalf Of Walter Katz
Sent: Friday, June 24, 2016 7:35 AM
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-macro] Re: What I believe Radek and I agreed to during the
IBIS-ATM meeting
All,
I have not received any comments on this e-mail, so I resurrected the Pin
Reference BIRD, made a number of changes and am enclosing it in this e-mail. In
summary, this BIRD allows the clear definition of a node that is connected to a
pin in the [Component] section that is used as the reference node for all
measurements when the Device is Under Test (DUT), and the Device is In Action
(DIA). This satisfies the requirement that all measurements of a device are
between nodes that are physically close together.
The natural outcome of this is that "absolute GND" is really "reference node",
and that C_comp must therefore be connected between the I/O pad and this
"reference node" in DUT and DIA.
One clear advantage of this BIRD is that [Pin Reference] is only needed when
doing Power Aware simulations with buffers that do not have any [*
Reference]=0.0V.
Walter
From: Walter Katz [mailto:wkatz@xxxxxxxxxx]
Sent: Tuesday, June 21, 2016 6:13 PM
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx<mailto:ibis-macro@xxxxxxxxxxxxx>>
Subject: What I believe Radek and I agreed to during the IBIS-ATM meeting
All,
If any one or more than one of the Model subparameters [Pulldown Reference],
[GND Clamp Reference] , [Pullup Reference] , [POWER Clamp Reference] and
[External Reference] are 0.0V, their corresponding model terminals
Pulldown_ref, Gnd_clamp_ref, Pullup_ref, Power_clamp_ref and Ext_ref
respectively are at the same node as the test fixture reference when the Device
is Under Test. Therefore, the nodes at these terminals should be connected
together during simulation, and they should be used as the reference terminal
for measurements of the other terminals of the device when used in action.
If none of the Model subparameters [Pulldown Reference], [GND Clamp Reference]
, [Pullup Reference] , [POWER Clamp Reference] and [External Reference] are
0.0V, then there must be something in the chip that is connected to a Pin that
is connected to the test fixture reference node (or simulator reference node 0
when doing SPICE to IBIS. This is not necessarily one of the terminals
Pulldown_ref, Gnd_clamp_ref, Pullup_ref, Power_clamp_ref and Ext_ref of a
legacy model. It could be A_gnd of an [External Model].
Therefore, if a [Model] does not have a [Pulldown Reference], [GND Clamp
Reference] , [Pullup Reference] , [POWER Clamp Reference] or [External
Reference] that is 0.0V, the model maker can assign to each [Pin] that uses
this [Model] a bus_label on a [Pin] that has Model_name POWER or GND as the
[Pin] in the component that should be connected to the test fixture reference
node when DUT, and should be the reference node for all voltage measurements
made at this I/O buffer.
Walter
Walter Katz
wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>
Phone 303.449-2308
Mobile 303.335-6156
