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[SI-LIST] Re: Problem with Cypress CY7C65640 USB Hub IBIS model
- From: "Lynne D. Green" <lgreen22@xxxxxxxxxxxxxx>
- To: <joel@xxxxxxxxxx>
- Date: Fri, 10 Mar 2006 14:54:59 -0800
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
>
>
>
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