Hi, In IBIS model there is package properties where package R,L,C values are defined. Again in pin declaration for each pin RLC values are specified. What is the difference ,In specctraquest If we are assigning model as IBIS devices, And if we apply pin by pin with specified pin model as like IBIS I/O , IBIS Input etc. Will there be any difference in simulation results? Will package properties taken in to account ,if do as per case 2? Please help in this regard. Sivagurunathan.M Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privileged information. If you are not the intended recipient, please notify the sender at Wipro or Mailadmin@xxxxxxxxx immediately and destroy all copies of this message and any attachments. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //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