RE: True or False?

You should use the .EBD file for this Arpad.
I thought the terminator keyword is intended to be used stand alone.

At 08:48 AM 10/8/98 -0700, Muranyi, Arpad wrote:
>I would vote for FALSE, because I could see them being used together in a
>situation where you have a differential pair going into the chip and come
>out on
>two other pins though a series model. For example, let's make
>
> pin2 = diff_in+
> pin3 = diff_in-
> pin4 = diff_out+
> pin5 = diff_out-
>
>where the ins and outs are "shorted" with metal.
>
>In this case the [Diff Pin] keyword would associate pins 2-3 and pins 4-5 as
>
>differencial, but the [Series Pin Mapping] keyword would connect pins 2-4
>and
>pins 3-5. Since the series models ignore the C_comp, the only way I can
>enter
>the die capacitance into this picture is if I use the Terminator model on
>each
>pin with nothing but C_comp in it.
>
>This is how I can see the series and terminator models used together with
>differencial pins.
>
>Arpad
>============================================================================
>====
>
>Chris:
>
>I vote for True.
>
>Bob Ross
>Interconnectix/Mentor Graphics
>
>> Date: Wed, 07 Oct 1998 16:15:07 -0700
>> From: Chris Rokusek <crokusek@viewlogic.com>
>> To: ibis@eda.org
>> Subject: True or False?
>
>
>> Ibisians,
>
>> I have a Quiz, True or False:
>
>> The models of pins referenced by a [Diff Pin] keyword may NOT be of any
>> of the following:
>
>> Terminator,
>> Series,
>> Series_switch.
>
>> Chris
>
>> I think the spec implicitly says TRUE...
>
>>
>|===========================================================================
>==
>> | Keyword: [Diff Pin]
>> | Required: No
>> | Description: Associates differential pins, their differential
>> threshold
>> | voltages, and differential timing delays.
>> | Sub-Params: inv_pin, vdiff, tdelay_typ, tdelay_min, tdelay_max
>> | Usage Rules: Enter only differential pin pairs. The first column,
>> [Diff
>> | Pin], contains a non-inverting pin name. The second
>> column,
>> | inv_pin, contains the corresponding inverting pin name
>> for
>> | I/O output. Each pin name must match the pin names
>> declared
>> | previously in the [Pin] section of the IBIS file. The
>> third
>> | column, vdiff, contains the specified output and
>> differential
>> | threshold voltage between pins if the pins are Input or
>> I/O
>> | model types. For output only differential pins, the
>> vdiff
>> | entry is 0 V. The fourth, fifth, and sixth columns,
>> | tdelay_typ, tdelay_min, and tdelay_max, contain launch
>> delays
>> | of the non-inverting pins relative to the inverting
>> pins. The
>> | values can be of either polarity.
>> |
>> | If a pin is a differential input pin, the differential
>> input
>> | threshold (vdiff) overrides and supersedes the need for
>> Vinh
>> | and Vinl.
>> |
>> | If vdiff is not defined for a pin that is defined as
>> requiring
>> | a Vinh by its [Model] type, vdiff is set to the default
>> value

>> | of 200 mV.
>> |
>> | Other Notes: The output pin polarity specification in the table
>> overrides
>> | the [Model] Polarity specification such that the pin in
>> the
>> | [Diff Pin] column is Non-Inverting and the pin in the
>> inv_pin
>> | column is Inverting. This convention enables one
>> [Model] to
>> | be used for both pins.
>> |
>> | Column length limits are:
>> | [Diff Pin] 5 characters max
>> | inv_pin 5 characters max
>> | vdiff 9 characters max
>> | tdelay_typ 9 characters max
>> | tdelay_min 9 characters max
>> | tdelay_max 9 characters max
>> |
>> | Each line must contain either four or six columns. If
>> "NA" is
>> | entered in the vdiff, tdelay_typ, or tdelay_min columns,
>> its
>> | entry is interpreted as 0 V or 0 ns. If "NA" appears in
>> the
>> | tdelay_max column, its value is interpreted as the
>> tdelay_typ
>> | value. When using six columns, the headers tdelay_min
>> and
>> | tdelay_max must be listed. Entries for the tdelay_min
>> column
>> | are based on minimum magnitudes; and tdelay_max column,
>> | maximum magnitudes. One entry of vdiff, regardless of
>> its
>> | polarity, is used for difference magnitudes.
>>
>|---------------------------------------------------------------------------
>--
>> [Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
>> |
>> 3 4 150mV -1ns 0ns -2ns | Input or I/O
>> pair
>> 7 8 0V 1ns NA NA | Output* pin
>> pair
>> 9 10 NA NA NA NA | Output* pin
>> pair
>> 16 15 200mV 1ns | Input or I/O pin pair
>> 20 19 0V NA | Output* pin pair, tdelay = 0
>> 22 21 NA NA | Output*, tdelay = 0
>> | * Could be Input or I/O with
>> vdiff = 0
>> |
>> |======================================================================
>
---------------------------------------------------------
Have a great day....
Kellee Crisafulli at HyperLynx
SI,EMC,X-talk and IBIS tools for the Windows platform
E-mail: <mailto:kellee@hyperlynx.com>
web:   <http://www.hyperlynx.com>
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Received on Thu Oct 8 12:40:52 1998