Nitin, Additional to Arpad's comments: There is a possibility to use Driver Schedule for multi-tap pre-emphasis buffer modeling. I did a presentation in 2005 and showed it works for 4 tap in the presentation below: (page 41) http://www.vhdl.org/pub/ibis/summits/mar05j/wang.pdf Also, you could do Spice-macromodeling with IBIS buffer models for pre-emphasis. The benefits for it are faster and can be used in the most of Spice simulators. Users will not be requested to cost more for new tools. http://iometh.com/Product/SIMDE/Macromodeling.pdf http://www.vhdl.org/pub/ibis/summits/oct06b/wang.pdf Hope this helps, Lance Wang IO Methodology Inc. SIMDET V1.0 - Signal Integrity Model Development Environment The complete IBIS / Spice Macromodel generation and validation tool www.iometh.com/Product/SIMDE -----Original Message----- From: si-list-bounce@freelists.org [mailto:si-list-bounce@freelists.org] On Behalf Of Muranyi, Arpad Sent: Wednesday, July 22, 2009 10:54 AM To: ibis@server.eda.org; si-list@freelists.org Subject: [SI-LIST] Re: [ibis-macro] IBIS model of drifferential driver with programmable multi-tap preemphasis Nitin, If you have access to the stimulus, you could pull this off with the Driver Schedule or even without it, but that would be a semi official IBIS solution because it may not work in all tools. For example, if you do it with the HSPICE B-element, you could make a B-element for each stage of your buffer, and then make a special stimulus generator which reproduces the bit pattern dependent waveforms for the input to each B-element (buffer stage). This way the stages of your buffer would still be IBIS models, but the relationship between them would be outside the IBIS world. Another way to do it would be to use the *-AMS extensions of IBIS. This way you could make a completely official model for the entire buffer. However, not all IBIS tools have implemented the *-AMS extensions of IBIS, although there are several tools with Verilog-A support which may be sufficient for what you want to do. I hope this helps. Arpad =============================================================== -----Original Message----- From: ibis-macro-bounce@freelists.org [mailto:ibis-macro-bounce@freelists.org] On Behalf Of Nitin Kumar CHHABRA Sent: Wednesday, July 22, 2009 7:14 AM To: ibis@server.eda.org; si-list@freelists.org Cc: vishrant.goyal@st.com; nitin.chhabra@st.com; nitin.gupta@st.com Subject: [ibis-macro] IBIS model of drifferential driver with programmable multi-tap preemphasis Hi experts, We want to develop the IBIS model for a differential driver with pre emphasis . The driver has three tap with programmable pre emphasis options. Does anyone came across such IBIS or could provide some IDEA how to proceed for the same. Using Driver Scheduling, we are able to make model for first tap pre emphasis buffer. But we cannot accommodate the second and third tap options as they require previous bit histories. with regards, Nitin --------------------------------------------------------------------- IBIS Macro website : http://www.eda.org/pub/ibis/macromodel_wip/ IBIS Macro reflector: http://www.freelists.org/list/ibis-macro To unsubscribe send an email: To: ibis-macro-request@freelists.org Subject: unsubscribe ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@freelists.org with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: http://www.freelists.org/webpage/si-list For help: si-list-request@freelists.org with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: http://www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -------------------------------------------------------------------- |For help or to subscribe/unsubscribe, e-mail majordomo@eda-stds.org |with the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or e-mail a request to ibis-request@eda-stds.org. | |IBIS reflector archives exist under: | | http://www.eda-stds.org/pub/ibis/email_archive/ Recent | http://www.eda-stds.org/pub/ibis/users_archive/ Recent | http://www.eda-stds.org/pub/ibis/email/ E-mail since 1993Received on Wed Jul 22 08:24:34 2009
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