Hi, Joel, You might want to look at the attached paper on IBIS model validation by Lynne Green: This was presented at the MUG conference last year. Since attachments are stripped from the SI reflector, SI list subscribers can view the paper online, or request a copy from me. http://www.mugweb.org/ Also, IBIS Support includes a free IBIS Model Review Service. You could forward this email to them, and they could then submit models for review. http://www.eigroup.org/ibis/support.htm Best regards, Lynne -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Joel Brown Sent: Friday, March 10, 2006 1:04 PM To: weston.beal@xxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Problem with Cypress CY7C65640 USB Hub IBIS model Weston, That seems to have fixed the problem. My simulation looks reasonable now. Is there an IBIS for Dummies book I should read, so I can troubleshoot these problems myself? Thanks - Joel Beal, Weston wrote: > Tom, > > I believe that the model in question is the bp_usb_hs which has two > rising and two falling waveforms. While this model has a couple of > small problems, I don't see anything from just looking at the text > that should cause a problem.=20 > > Joel, > I think that the problem is the circuit that you are simulating. > Notice that the buffer model has essentially 0 current in the normal > operating range. Without some resistance across the differential pair, > the simulator probably can't get the correct initial DC operating > point. Try putting a 90 Ohm resistor across the receiver pins in your > simulation circuit. > > Later, > Weston > > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx] > On Behalf Of Tom Dagostino > Sent: Friday, March 10, 2006 12:08 PM > To: joel@xxxxxxxxxx; si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Re: Problem with Cypress CY7C65640 USB Hub IBIS > model > > Joel > > This model has only the rising and falling waveforms with the load > terminated to Vcc. Without the rising and falling waveforms to ground > it will not simulate correctly. > > Tom Dagostino > Teraspeed(R) Labs > 13610 SW Harness Lane > Beaverton, OR 97008 > 503-430-1065 > tom@xxxxxxxxxxxxx > www.teraspeed.com > > Teraspeed Consulting Group LLC > 121 North River Drive > Narragansett, RI 02882 > 401-284-1827 > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx > [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Joel Brown > Sent: Friday, March 10, 2006 11:46 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Problem with Cypress CY7C65640 USB Hub IBIS model > > > Has anybody used the Cypress CY7C65640 USB Hub IBIS model? > I seem to having problems with it when simulating in Hyperlynx. > First of all the part has 5 USB ports on it, but Cypress only defined > one port as differential. > So when I try to select a diff pair in Hyperlynx only one side of the > pair gets selected. > I was able to correct this by editing the IBIS file and adding Diff > Pin statements to define the other 4 USB ports as differential. > When I simulate with the CY7C65640 driving the USB lines and use 45 > ohm termination to ground at the connector end of the lines then > everything looks good. If I use the CY7C65640 in receive mode to > terminate instead of the 45 ohm resistors then it looks bad. It seem > that something is wrong with this model when used as a receiver. If > you want to see the model it is located on Cypress web site at: > http://www.cypress.com/portal/server.pt?space=3DCommunityPage&control= > 3DS= > etC > ommu > nity&CommunityID=3D209&PageID=3D418&r_folder=3DModels&r_title=3DCY7C65 > 640= > -Ibis > > I have tried using Cypress tech support in the past and it was a > disaster. You can't talk to anybody they have some web based system > that takes days to get an answer and usually the answer you get is > useless. I tried looking for some other USB transceiver IBIS model to > try but have not been able to find one. > > Thanks - Joel > > > > -- Binary/unsupported file stripped by Ecartis -- > -- Type: text/x-vcard > -- File: joel.vcf > > > ------------------------------------------------------------------ > 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 > > > > ------------------------------------------------------------------ > 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 > > > > -- Binary/unsupported file stripped by Ecartis -- -- Type: text/x-vcard -- File: joel.vcf ------------------------------------------------------------------ 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 -- Binary/unsupported file stripped by Ecartis -- -- Type: application/x-zip-compressed -- File: user2user_2005.zip ------------------------------------------------------------------ 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