Hello Clifford, Are you using the "Xilinx RocketIO Design kit for HyperLynx" or the "Xilinx RocketIO Design kit for ICX" available on the Xilinx SPICE website? These kits contain SPICE models re-encrypted to work in the much more stable alternative to HSPICE delivered with ICX and HyperLynx. We can work with your silicon/connect/cable/etc vendor to re-encrypt models for ICX and HyperLynx as well. Just have them contact me. These kits also use various techniques including the latest multi-lingual extensions in IBIS 4.1 to make the GHz analysis as simple as traditional analysis. Do note that I said "as simple", not "as fast" ... Transistor-level simulation will always be hundreds of times slower than traditional IBIS table-based analysis. But, we have the solution for the speed problem as well. Again, have your component supplier contact me for more details. Gary -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [ mailto:si-list-bounce@xxxxxxxxxxxxx <mailto:si-list-bounce@xxxxxxxxxxxxx> ] On Behalf Of Clifford van Dyk Sent: Monday, July 26, 2004 12:32 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] SI Simulation of GHz signals Hello I would like to perform reliable simulation of GHz signals (up to 3.125GHz), specifically Xilinx RocketIO. I would like to include in the simulation the effects of the following: Driver->PCB trace (incl. vias)->connector->cable->connector->PCB trace(incl. vias)->Receiver The models that I have obtained from the various vendors are HSPICE models. I have evaluated two of the most recommended S.I. toolchains: Mentor G. HyperLynx and Cadence Spectraquest. Both tools use HSPICE as the simulation engine, and essentially act as a front-end gui to HSPICE, as well as extracting the PCB trace/via models. My experiences thusfar with both tools have not been good. Anything but the most simplistic of traces causes the tools to either crash or take rediculous time to process (of the order of hours for even a simple net). A further issue is that both of these tool vendors claim that the HSPICE simulator is not necessary, and that the simulation can be performed without it, but practically this is not the case, due to a lack of availability of reliable models in anything other than HSPICE format. The conversion from HSPICE to any of the custom modelling types is also, in my opinion, non-trivial and potentially an extremely tedious manual process. I believe that S-Parameter based simulation provides much faster simulation, but again there is a lack of availability of S-Parameter models. Can anyone recommend a method for simulating the above signals that is simple, robust and reliable, or is the simulation of such signals still premature? Coming from a HW design background, I am fairly new to S.I., but it seems surprising that there is no industry-standard modelling type (equivalent of IBIS) that cable/connector vendors will provide, but maybe this level of simulation is in its infancy, and S-Parameter models will emerge as the standard? Is the simulation of such signals entirely necessary? I am dubious about the reliability of the results of such simulations, and I am wondering whether it is not more practical to just take all the precautions possible and hope for the best! Please let me know if you have any advise, or a good solution to my dilemma! Kind regards, Clifford ------------------------------------------------------------------ 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 <//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 <http://si-list.org/wiki/wiki.pl?Si-List_FAQ> List technical documents are available at: http://www.si-list.org <http://www.si-list.org> List archives are viewable at: //www.freelists.org/archives/si-list <//www.freelists.org/archives/si-list> or at our remote archives: http://groups.yahoo.com/group/si-list/messages <http://groups.yahoo.com/group/si-list/messages> Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu <http://www.qsl.net/wb6tpu> ------------------------------------------------------------------ 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