Hi Nitin, Cadence Allegro PCB SI (SPECCTRAQuest) tools can do exactly what you are looking for. Extract the simulation model from layout, simulate, modify the topology (add or delete vias, change trace model parameters, use different IBIS models, make modifications to termination, etc.) resimulate and implement modification into the layout.=20 You may goto http://www.cadence.com/products/si_pk_bd/index.aspx and click on Allegro PCB SI in the right hand Product area of the website to read more about this solution. Best Regards=20 Juergen Flamm C.I.D. =20 =20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Nitin Sood Sent: Wednesday, October 06, 2004 10:13 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] SI Simulation post layout Hello, Is there a tool that would allow me to simulate post layout design with greater flexibility to analyze nets, edit nets and see its effect on the integrity of the signal? Hyper-lynx doesn't allow me to cut nets or stubs and see its effect on = =3D the signal. Every change intended needs to be incorporated in the layout and =3D then translated into hyper-lynx to be re-simulated. I appreciate your time and any leads. Thanks Nitin Sood. ------------------------------------------------------------------ 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: =20 //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 =20 ------------------------------------------------------------------ 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