Hello Tod, A series resistor is used with parrallel terminated load in JEDEC SSTL_2 Class I or ClassII Output Buffers. I think "parallel terminated loads with series resistor" should be defined as timing test load in IBIS models because this setup is also used for timing measurement of buffers. In my case Series resistance value is 25 Ohms. thanks n regards Prabhat Todd Westerhoff wrote: > I agree with Arpad ... with the spec as it exists today, I don't think > you can specify a series resistance in the test load. > > What value of Rseries are you looking to include, and what is its > purpose in the reference timing measurement? > > Todd. > >Todd Westerhoff >VP, Software Products >SiSoft >6 Clock Tower Place, Suite 250 >Maynard, MA 01754 >(978) 461-0449 x24 >twesterh@sisoft.com >www.sisoft.com > > > > > Muranyi, Arpad wrote: > >> I am not sure you can. The keyword [Test Load] may >> let you do it with Rs_near and Rs_far, but I don't >> see a Vmeas in this keyword, and its purpose is >> slightly different (Golden Waveforms). >> >> Arpad >> ==================================================== >> >> ------------------------------------------------------------------------ >> *From:* owner-ibis-users@server.eda.org >> [mailto:owner-ibis-users@server.eda.org] *On Behalf Of *Prabhat RANJAN >> *Sent:* Monday, October 13, 2008 6:59 AM >> *To:* ibis-users@server.eda.org >> *Cc:* Prabhat RANJAN >> *Subject:* [IBIS-Users] Timing test load >> >> Hello Experts, >> >> For a Output buffer IBIS model, I have following type Timing test >> load setup. >> >> >> _________ >> | | >> | |\ | Rseries Rref >> |DRIVER| \|---O----/\/\/\----O----/\/\/\---o Vref >> | | /| | >> | |/ | --- Cref >> |_________ | --- >> | >> | >> GND >> >>Vref, Cref and Rref keywords are existing in IBIS spec. But how can I mention Rseries resistance as *TIMING TEST LOAD* in my IBIS model? >> >> >>-- >> >>Thanks n Regards >>Prabhat Ranjan >> >> >> >> >> -- >> This message has been scanned for viruses and >> dangerous content by *MailScanner* <http://www.mailscanner.info/>, >> and is >> believed to be clean. >> -- >> This message has been scanned for viruses and >> dangerous content by *MailScanner* <http://www.mailscanner.info/>, >> and is >> believed to be clean. > > > -- > This message has been scanned for viruses and > dangerous content by *MailScanner* <http://www.mailscanner.info/>, 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 | subscribe ibis-users | unsubscribe ibis | unsubscribe > ibis-users | |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 1993 -- Regards Prabhat Ranjan -- 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 Oct 15 00:27:11 2008
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