From: owner-ibis-users@eda.org (ibis-users) To: ibis-users-digest@eda.org Subject: ibis-users V1 #224 Reply-To: Sender: owner-ibis-users@eda.org Errors-To: owner-ibis-users@eda.org Precedence: bulk ibis-users Wednesday, September 18 2013 Volume 01 : Number 224 ---------------------------------------------------------------------- Date: Mon, 16 Sep 2013 08:29:11 +0000 From: Rene Voshol Subject: [IBIS-Users] Clarification on [Series Pin Mapping] and [Model Selector] - --_000_4e115ffdad19499e8a9978d2e8c9d00aAMSPR04MB065eurprd04pro_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I have been making IBIS models for some time now. When devices are availabl= e in multiple packages I include these as different components. Up till now= I included the [Series Pin Mapping][ and the [Model Selector] sections onl= y once since they apply to all components. But after re-reading the IBIS sp= ecification I came to the conclusion that these sections should actually be= included in each [Component]. The questions I have now: 1. Did I read the specification correct? 2. The simulator I use seems to work fine with only one [Model Selector]= section. Do different simulators treat this differently? In other words, d= o I run the risk that models that work fine with me, do not run correctly w= ith customers? Kind Regards, Ren=E9 Voshol - --=20 This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - --_000_4e115ffdad19499e8a9978d2e8c9d00aAMSPR04MB065eurprd04pro_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,

 

I have been making IBIS models for some time now. When dev= ices are available in multiple packages I include these as different compon= ents. Up till now I included the [Series Pin Mapping][ and the [Model Selector] sections only once since they apply to all components= . But after re-reading the IBIS specification I came to the conclusion that= these sections should actually be included in each [Component]. The questi= ons I have now:

 

1.    Did I read the specification correct?

2.    The simulator I use seems to work fine with only o= ne [Model Selector] section. Do different simulators treat this differently= ? In other words, do I run the risk that models that work fine with me, do not run correctly with customers?

 

Kind Regards,

 

Ren=E9 Voshol

 

 


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This message has been scanned for viruses and
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believed to be clean. - --_000_4e115ffdad19499e8a9978d2e8c9d00aAMSPR04MB065eurprd04pro_-- - -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail mikelabonte@eda-stds.org |or ibis-request@eda-stds.org | |IBIS reflector archives exist under: | | http://www.eda-stds.org/ibis/email_archive/ Recent | http://www.eda-stds.org/ibis/users_archive/ Recent | http://www.eda-stds.org/ibis/email/ E-mail since 1993 ------------------------------ Date: Wed, 18 Sep 2013 18:33:09 +0400 From: Andrey Babintsev Subject: [IBIS-Users] {Spam?} {Filename?} LVDS IBIS model - simulation issue - --------------060106070003070003040605 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Warning: This message has had one or more attachments removed Warning: (fail.min.png). Warning: Please read the "EDA-Attachment-Warning.txt" attachment(s) for more information. Hi, I am making IBIS models for LVDS (low voltage differential signal) IO buffer. To model an LVDS buffer I created the following test circuit, assigned the generated IBIS model to both buffers, set one buffer as inverted output. *Problem:* In the image below the YELLOW waveform is what I saw and the PURPLE waveform is what I expected to see. YELLOW = IBIS model PURPLE = Spice ( reference ) model Here is combined pullUp (yellow) and pullDown (green) IV curves (actually it is spice curves from which IV tables were derived): Lets assume that simulator tries to find operational point for LVDS buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) will be taken from pullUp table, for the inverted buffer a point (Vn, In) from pullDown table, the following conditions should be satisfied: Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are 2 points satisfying the condition: Vp =~ 1.45V and Vp =~ 2.2V. Seems that something like that happened during simulation and simulator got to the second point. (BTW, there are 60 points for the region 0.9 - 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables). *Question:* What can be done to resolve this situation? Should IV tables or another IBIS structures be modified and how? I am making *ibis ver. 4.2* models. Thanks, Andrey - --------------060106070003070003040605 Content-type: multipart/mixed; boundary="------------000905000402090503030706" - --------------000905000402090503030706 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit

Warning: This message has had one or more attachments removed (fail.min.png). Please read the "EDA-Attachment-Warning.txt" attachment(s) for more information.

Hi,

I am making IBIS models for LVDS (low voltage differential signal) IO buffer.
To model an LVDS buffer I created the following test circuit, assigned the generated IBIS model to both buffers, set one buffer as inverted output.


Problem:
In the image below the YELLOW waveform is what I saw and the PURPLE waveform is what I expected to see.

YELLOW = IBIS model
PURPLE = Spice ( reference ) model

Here is combined pullUp (yellow) and pullDown (green) IV curves (actually it is spice curves from which IV tables were derived):


Lets assume that simulator tries to find operational point for LVDS buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) will be taken from pullUp table, for the inverted buffer a point (Vn, In) from pullDown table, the following conditions should be satisfied: Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are 2 points satisfying the condition: Vp =~  1.45V and Vp =~ 2.2V. Seems that something like that happened during simulation and simulator got to the second point. (BTW, there are 60 points for the region 0.9 - 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables).

Question:
What can be done to resolve this situation? Should IV tables or another IBIS structures be modified and how? I am making ibis ver. 4.2 models.

Thanks,
Andrey
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At Wed Sep 18 07:28:11 2013 the virus scanner said: MailScanner: Attempt to hide real filename extension (fail.min.png) Note to Help Desk: Look on the EDA () MailScanner in /var/spool/MailScanner= /quarantine/20130918 (message r8IESAui031675). - --=20 Postmaster Electronic Design Automation Collaboration Server hosted by Accellera And S= tanford www.eda.org For all your IT requirements visit: http://www.transtec.co.uk - --------------000905000402090503030706-- - --------------060106070003070003040605-- - -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail mikelabonte@eda-stds.org |or ibis-request@eda-stds.org | |IBIS reflector archives exist under: | | http://www.eda-stds.org/ibis/email_archive/ Recent | http://www.eda-stds.org/ibis/users_archive/ Recent | http://www.eda-stds.org/ibis/email/ E-mail since 1993 ------------------------------ Date: Fri, 13 Sep 2013 08:55:09 -0700 From: "Bob Ross" Subject: [IBIS-Users] Asian IBIS Summit (Shanghai) - Second Announcement This is a multipart message in MIME format. - ------=_NextPart_000_0066_01CEB05E.F3E63D90 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To All: The IBIS Open Forum is holding an Asian IBIS Summit Meeting in Shanghai, China on Friday, November 15, 2013. Several companies listed below are co-sponsoring this large event to be held again at the Parkyard Hotel, Shanghai. We encourage technical contributions from Asia. For travel consideration, two other Asian IBIS Summits follow this event: Taipei, Taiwan, Tuesday, November 19, Sherwood Hotel Yokohama, Japan, Friday, November 22, Pacifico Yokohama Announcements for these Summits will be issued later. Lance Wang IO Methodology Inc. Bob Ross Teraspeed Consulting Group - ----------------------------------------------------------------------- ASIAN IBIS SUMMIT (SHANGHAI) SECOND CALL FOR PARTICIPATION AND PRESENTATIONS - ----------------------------------------------------------------------- http://www.eda.org/ibis/summits/nov13a/announcement_chinese.pdf ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A S I A N I B I S S U M M I T ( S H A N G H A I ) Time/Date: Friday, November 15, 2013, 8:00 AM to 5:30 PM Meeting starts at 9:00 AM Location: Parkyard Hotel Shanghai 699 Bibo Road Zhangjiang Hi-Tech Park Shanghai 201203 P.R. China http://www.parkyard.com/en/hotel_index.aspx?currenthotelid=6 Content: Presentations and Discussions Purpose: Solicit and exchange IBIS and interconnect model related information and ideas. Primary Sponsor: Huawei Technologies Co-sponsors (in alphabetical order): Agilent Technologies Intel Corporation IO Methodology Synopsys others TBD Cost: FREE, including refreshments and buffet lunch Vendors: Some vendors will have information tables Contact us for details regarding sponsorship. BACKGROUND We have held seven successful meetings in Shenzhen, Shanghai and Beijing. This year we are meeting again in Shanghai where many Chinese and foreign high technology companies operate. These events are archived along with all our other Summits: http://www.eda.org/pub/ibis/summits/ Our objective is to reach out internationally to communicate with the local experts and to learn of regional concerns. CONFERENCE LANGUAGE The conference language is English, but we will plan for technical translations in English and Mandarin. So presenters can optionally deliver in Mandarin as long as an English version of the material is available. IBIS SUMMIT This meeting will be conducted as a formal IBIS Summit Meeting. Presentations will be archived in an electronic format on our Summits site, and minutes of the meeting will be issued. However, no formal decisions requiring votes will be planned. CALL FOR PARTICIPANTS People involved in IBIS and interconnect model development, EDA tool development, and digital circuit design are invited to participate in the Summit meeting. If you plan to participate, please register using the information below (in English): Name: E-mail address: Company: Top-level Web Link: Country: Send to BOTH: Lance Wang, IO Methodology Inc. lwang@iometh.com Bob Ross, Teraspeed Consulting Group bob@teraspeed.com SIGNUP DEADLINE: November 8, 2013 CALL FOR PRESENTATIONS We are seeking presentations from individuals who have IBIS and interconnect modeling experiences or issues. If we have to select presentations for the number of time slots available, we will give preferential consideration to presentations from Asia. Presentation Format: LCD Projection from meeting laptop computer Time: 15-30 Minutes including questions Electronic Archival: All presentations will uploaded to our public IBIS Summit archives Electronic Format: Power Point or Acrobat Presentation Booklet: Available at the meeting for all attendees Presentation Deadline: October 11, 2013 to produce the presentation booklet for the meeting If you plan a presentation, please ADD to the above registration information: Title of Presentation: Estimated Time: (30 minutes or less) We will notify you of acceptance and may follow up with questions when we form the program agenda. Note: Vendor promotional or business information is prohibited. Submitted presentations must be in English, although the delivery can be in Mandarin. Submissions from Asia are encouraged along with other submissions world-wide. Topics may include behavioral modeling of buffers, interconnects or other system components. AGENDA 8:15 - 9:00 Vendor table setup and tables 8:30 - 9:00 Sign in 9:00 - 12:00 Presentations 12:00 - 13:30 Free buffet lunch, vendor tables 13:30 - 17:00 Presentations The specific agenda is being developed. We expect nine or ten presentations covering a range of issues from existing customer experiences, existing clarifications and some future technical directions in IBIS. Several major IBIS Committee presentations from IBIS officers or active members are planned. Several presentations on IBIS applications and behavioral modeling issues, including interconnects and system components, are expected from co-sponsor companies and/or their customers. LIST OF NEARBY HOTELS AND TRAVEL RULES Hotels in all price ranges can be found through internet searches. Comply with your travel rules, such as indicated in the link below to China and Shanghai. Work with your travel agent. Notify us as a sign-up comment if you need assistance. Visas, if needed, should fall in the visit/business category: http://travel.state.gov/travel/cis_pa_tw/cis/cis_1089.html - ----------------------------------------------------------------- - -- Bob Ross Teraspeed Consulting Group, LCC http://www.teraspeed.com bob@teraspeeed.com Direct : 503-246-8048 Teraspeed Labs: 971-279-5325 Headquarters: 401-284-1827 Teraspeed is a registered service mark of Teraspeed Consulting Group LLC - -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - ------=_NextPart_000_0066_01CEB05E.F3E63D90 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

To All:

 =

The I= BIS Open Forum is holding an Asian IBIS Summit Meeting in=

Shang= hai, China on Friday, November 15, 2013.

 

Sev= eral companies listed below are co-sponsoring this large event

= to be held again at the Parkyard Hotel, Shanghai.

 

We encourage technical contributions from Asia.

=

&nbs= p;

For travel consideration, two other Asian IBIS Summits follow thi= s

event:

 

  Taipei, Taiwan, = Tuesday, November 19, Sherwood Hotel

  Yokohama, Japan, Fr= iday, November 22, Pacifico Yokohama

 

Announc= ements for these Summits will be issued later.

 

IO Methodology Inc.

 =

Teraspeed Consulting Group

 

 

 

-------------------------------= - ----------------------------------------

   &nbs= p;            &= nbsp;      ASIAN IBIS SUMMIT (SHANGHAI)=

    &n= bsp;            = ;     PARTICIPATION AND PRESENTATIONS=

-----= - ------------------------------------------------------------------

 

http://www.eda.org/ibis/summits/nov13a/announcement_= chinese.pdf

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~= ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 

&nbs= p;          A S I A N &nb= sp; I B I S   S U M M I T   ( S H A N G H A I )

 

Time/Date:  Friday, November 15, 2013, 8:00 AM= to 5:30 PM

        &nb= sp;   Meeting starts at 9:00 AM

 

Lo= cation:   Parkyard Hotel Shanghai

   = ;         699 Bibo Road<= /span>

            Zhangji= ang Hi-Tech Park

       &n= bsp;    Shanghai 201203

    =         P.R. China

=

&nbs= p;

      http://www.parkyard.com/en/hotel_i= ndex.aspx?currenthotelid=3D6

<= span style=3D'font-family:"Courier New"'> 

Content: &= nbsp;  Presentations and Discussions

 

Pu= rpose:    Solicit and exchange IBIS and interconnect model r= elated

         &n= bsp;  information and ideas.

 

<= p class=3DMsoPlainText>Primary Sp= onsor:

         &n= bsp;  Huawei Technologies

 

Co-sponsors (= in alphabetical order):

      &nb= sp;     Agilent Technologies

  &n= bsp;         Intel Corporation=

            = IO Methodology

        =     Synopsys

      = ;      others TBD

 

C= ost:       FREE, including refreshments and b= uffet lunch

 

Vendors:    Some = vendors will have information tables

 

 &= nbsp;          Contact us for = details regarding sponsorship.

 

BACKGROUND

 

   We have held seven successful m= eetings in Shenzhen, Shanghai and Beijing.

   This ye= ar we are meeting again in Shanghai where many Chinese and

&nbs= p;  foreign high technology companies operate.  These events are = archived

   along with all our other Summits:

 

     http://www.eda.org/pub/ibi= s/summits/

 

=    Our objective is to = reach out internationally to communicate with

   the = local experts and to learn of regional concerns.

 

CONFERENCE LANGUAGE

 

   The = conference language is English, but we will plan for technical

=    translations in English and Mandarin.  So presenters can = optionally

   deliver in Mandarin as long as an Engli= sh version of the material is

=    available.

IBIS SUMMIT

 

<= p class=3DMsoPlainText> &nbs= p; This meeting will be conducted as a formal IBIS Summit Meeting.

   Presentations will be archived in an electronic format on = our

   Summits site, and minutes of the meeting will = be issued.  However,

   no formal decisions requ= iring votes will be planned.

<= span style=3D'font-family:"Courier New"'> 

CALL FOR PARTIC= IPANTS

 

   People involved in IBIS = and interconnect model development, EDA

   tool devel= opment, and digital circuit design are invited to

   = participate in the Summit meeting.  If you plan to participate,

   please register using the information below (in English)= :

 

     Name:<= /span>

     E-mail address:

 

&n= bsp;    Company:

     Top-le= vel Web Link:

 

     Count= ry:

 

   Send to BOTH:

<= o:p> 

     Lance Wang, IO Methodology Inc.&= nbsp;        lwang@iometh.com=

 

 =

 

CALL FOR PRESENTATIONS

 

   We = are seeking presentations from individuals who have IBIS and

&n= bsp;  interconnect modeling experiences or issues.  If we have to=

   select presentations for the number of time slots= available, we

   will give preferential consideratio= n to presentations from Asia.

=  

   P= resentation Format:   LCD Projection from meeting laptop computer=

 

   Time:    &= nbsp;           &nbs= p; 15-30 Minutes including questions

 

 &= nbsp; Electronic Archival:   All presentations will uploaded to o= ur public

         = ;            &n= bsp;    IBIS Summit archives

 =

 

   Presentation Booklet:&nbs= p; Available at the meeting for all attendees

 =

         &= nbsp;           &nbs= p;    booklet for the meeting

 =

   information:

 

&= nbsp;    Title of Presentation:

 

   = ;    (30 minutes or less)

 

&nb= sp;  We will notify you of acceptance and may follow up with questions=

   when we form the program agenda.

 

   Note: Vendor promotional or business informatio= n is prohibited.

   Submitted presentations must be= in English, although the delivery

   can be in Manda= rin.

 

   Submissions from Asia are = encouraged along with other submissions

   world-wide= .  Topics may include behavioral modeling of buffers,

&nbs= p;  interconnects or other system components.

 <= /o:p>

AGENDA

 

   8:15 -  = ; 9:00  Vendor table setup and tables

   8:30 -&= nbsp;  9:00  Sign in

   9:00 -  12:00&= nbsp; Presentations

   12:00 - 13:30  Free buffe= t lunch, vendor tables

   13:30 - 17:00  Present= ations

 

   The specific agenda is b= eing developed.  We expect nine or ten

   pres= entations covering a range of issues from existing customer

&nb= sp;  experiences, existing clarifications and some future technical

   directions in IBIS.

 

&= nbsp;  Several major IBIS Committee presentations from IBIS officers o= r

   active members are planned.

&nb= sp;

   Several presentations on IBIS applications and beha= vioral modeling

   issues, including interconnects an= d system components, are expected

   from co-sponsor = companies and/or their customers.

 

<= p class=3DMsoPlainText>LIST OF NE= ARBY HOTELS AND TRAVEL RULES

<= span style=3D'font-family:"Courier New"'> 

   Ho= tels in all price ranges can be found through internet searches.=

   Comply with your travel rules, such as in= dicated in the link

   below to China and Shanghai.&n= bsp; Work with your travel agent.  Notify

   us = as a sign-up comment if you need assistance.  Visas, if needed,

   should fall in the visit/business category:

=  

     http://travel.state.gov/travel/= cis_pa_tw/cis/cis_1089.html

 

----------------= - -------------------------------------------------

 

--

Bob Ross

Teraspeed Consulting Group, LCC

ht= tp://www.teraspeed.com

bob@teraspeeed= .com

Direct : 503-246-8048=

Teraspeed Labs: 971-279-5325

Headquarters: 401-284-1827

 

Teraspeed is a regis= tered service mark of Teraspeed Consulting Group LLC

 


--=20
This message has been scanned for viruses and
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believed to be clean. - ------=_NextPart_000_0066_01CEB05E.F3E63D90-- - -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail mikelabonte@eda-stds.org |or ibis-request@eda-stds.org | |IBIS reflector archives exist under: | | http://www.eda-stds.org/ibis/email_archive/ Recent | http://www.eda-stds.org/ibis/users_archive/ Recent | http://www.eda-stds.org/ibis/email/ E-mail since 1993 ------------------------------ Date: Wed, 18 Sep 2013 18:38:08 +0400 From: Andrey Babintsev Subject: Re: [IBIS-Users] {Spam?} {Filename?} LVDS IBIS model - simulation issue - --------------070108000406070103050602 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Re-sending with updated attachment Hi, I am making IBIS models for LVDS (low voltage differential signal) IO buffer. To model an LVDS buffer I created the following test circuit, assigned the generated IBIS model to both buffers, set one buffer as inverted output. *Problem:* In the image below the YELLOW waveform is what I saw and the PURPLE waveform is what I expected to see. YELLOW = IBIS model PURPLE = Spice ( reference ) model Here is combined pullUp (yellow) and pullDown (green) IV curves (actually it is spice curves from which IV tables were derived): Lets assume that simulator tries to find operational point for LVDS buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) will be taken from pullUp table, for the inverted buffer a point (Vn, In) from pullDown table, the following conditions should be satisfied: Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are 2 points satisfying the condition: Vp =~ 1.45V and Vp =~ 2.2V. Seems that something like that happened during simulation and simulator got to the second point. (BTW, there are 60 points for the region 0.9 - 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables). *Question:* What can be done to resolve this situation? Should IV tables or another IBIS structures be modified and how? I am making *ibis ver. 4.2* models. Thanks, Andrey On 09/18/2013 06:33 PM, Andrey Babintsev wrote: > > *Warning: This message has had one or more attachments removed > (fail.min.png). Please read the "EDA-Attachment-Warning.txt" > attachment(s) for more information.* > > Hi, > > I am making IBIS models for LVDS (low voltage differential signal) IO > buffer. > To model an LVDS buffer I created the following test circuit, assigned > the generated IBIS model to both buffers, set one buffer as inverted > output. > > > *Problem:* > In the image below the YELLOW waveform is what I saw and the PURPLE > waveform is what I expected to see. > > YELLOW = IBIS model > PURPLE = Spice ( reference ) model > > Here is combined pullUp (yellow) and pullDown (green) IV curves > (actually it is spice curves from which IV tables were derived): > > > Lets assume that simulator tries to find operational point for LVDS > buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) > will be taken from pullUp table, for the inverted buffer a point (Vn, > In) from pullDown table, the following conditions should be satisfied: > Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are > 2 points satisfying the condition: Vp =~ 1.45V and Vp =~ 2.2V. Seems > that something like that happened during simulation and simulator got > to the second point. (BTW, there are 60 points for the region 0.9 - > 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables). > > *Question:* > What can be done to resolve this situation? Should IV tables or > another IBIS structures be modified and how? I am making *ibis ver. > 4.2* models. > > Thanks, > Andrey - -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. - --------------070108000406070103050602 Content-Type: multipart/related; boundary="------------070008040005020703020507" - --------------070008040005020703020507 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit
Re-sending with updated attachment

Hi,

I am making IBIS models for LVDS (low voltage differential signal) IO buffer.
To model an LVDS buffer I created the following test circuit, assigned the generated IBIS model to both buffers, set one buffer as inverted output.


Problem:
In the image below the YELLOW waveform is what I saw and the PURPLE waveform is what I expected to see.

YELLOW = IBIS model
PURPLE = Spice ( reference ) model

Here is combined pullUp (yellow) and pullDown (green) IV curves (actually it is spice curves from which IV tables were derived):


Lets assume that simulator tries to find operational point for LVDS buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) will be taken from pullUp table, for the inverted buffer a point (Vn, In) from pullDown table, the following conditions should be satisfied: Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are 2 points satisfying the condition: Vp =~  1.45V and Vp =~ 2.2V. Seems that something like that happened during simulation and simulator got to the second point. (BTW, there are 60 points for the region 0.9 - 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables).

Question:
What can be done to resolve this situation? Should IV tables or another IBIS structures be modified and how? I am making ibis ver. 4.2 models.

Thanks,
Andrey



On 09/18/2013 06:33 PM, Andrey Babintsev wrote:

Warning: This message has had one or more attachments removed (fail.min.png). Please read the "EDA-Attachment-Warning.txt" attachment(s) for more information.

Hi,

I am making IBIS models for LVDS (low voltage differential signal) IO buffer.
To model an LVDS buffer I created the following test circuit, assigned the generated IBIS model to both buffers, set one buffer as inverted output.


Problem:
In the image below the YELLOW waveform is what I saw and the PURPLE waveform is what I expected to see.

YELLOW = IBIS model
PURPLE = Spice ( reference ) model

Here is combined pullUp (yellow) and pullDown (green) IV curves (actually it is spice curves from which IV tables were derived):


Lets assume that simulator tries to find operational point for LVDS buffer driving high. Then for the non-inverted buffer a point (Vp, Ip) will be taken from pullUp table, for the inverted buffer a point (Vn, In) from pullDown table, the following conditions should be satisfied: Ip = In, Vp - Vn = Ip*50. On the image above it is seen that there are 2 points satisfying the condition: Vp =~  1.45V and Vp =~ 2.2V. Seems that something like that happened during simulation and simulator got to the second point. (BTW, there are 60 points for the region 0.9 - 1.6V and 10 points for the region 1.6-2.5V in the IBIS model IV tables).

Question:
What can be done to resolve this situation? Should IV tables or another IBIS structures be modified and how? I am making ibis ver. 4.2 models.

Thanks,
Andrey

--
This message has been scanned for viruses and
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