[ibis-interconn] [Pin Mapping] in IBIS 6.0
- From: Walter Katz <wkatz@xxxxxxxxxx>
- To: "IBIS-Interconnect" <ibis-interconn@xxxxxxxxxxxxx>
- Date: Wed, 15 Oct 2014 12:04:13 -0400 (EDT)
All,
All occurrences of [Pin Mapping] in IBIS 6.0 (except in the [Pin Mapping]
section.
Page 72:
The [Composite Current] I-T table includes all of the current through the
[Pullup Reference] terminal. If the [POWER Clamp Reference] terminal is
the same as the [Pullup Reference] terminal (according to the [Pin
Mapping] keyword table), the [Composite Current] entries include the
currents through both the [POWER Clamp] and [Pullup] sections of the DUT
(for example, when an on-die terminator is connected to the power
reference terminal). Note that the terminals are shown in terms of
separately defined reference voltages, but still exist even if they are
defined with default [Voltage Range] or 0 V settings.
Page 74:
While the [Composite Current] already includes the buffer I_byp current,
some Series model type elements may be used to document an equivalent
bypass impedance to improve simulation results. Such an equivalent
impedance can be extracted on a per buffer basis, but summed and expressed
as a total equivalent impedance between the power and ground pins of the
component with the Series model type keywords, including [C Series], [Lc
Series], [Rc Series], and [R Series] under a separate [Model]. These
elements are connected using the [Series Pin Mapping] keyword. Paths
between several voltage rails can be modeled in this manner. The [Pin
Mapping] keyword documents what buffers share common and often isolated
power rails.
Page 75:
The [Pin Mapping] keyword is used to document how buffers with common
voltage rails are connected. The effective impedances for each buffer
between the [Pullup Reference] and [Pulldown Reference] are then combined
to form the total effective impedance between the voltage rails.
Page 100:
The rules for pad connections with [External Model] are identical to those
for [Model]. The [Pin Mapping] keyword may be used with [External Model]s
but is not required. If used, the [External Model] specific voltage
supply ports-A_puref, A_pdref, A_gcref, A_pcref, and A_extref-are
connected as defined under the [Pin Mapping] keyword. In all cases, the
voltage levels connected on the reserved supply ports are defined by the
[Power Clamp Reference], [GND Clamp Reference], [Pullup Reference],
[Pulldown Reference], and/or [Voltage Range] keywords, as in the case of
[Model].
Page 121:
The [Pin Mapping] keyword cannot be used with [External Circuit] in the
same [Component] description.
Walter
Walter Katz
<mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx
Phone 303.449-2308
Mobile 303.335-6156
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