[SI-LIST] Re: Problem with Cypress CY7C65640 USB Hub IBIS model
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: <joel@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 10 Mar 2006 12:08:21 -0800
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=CommunityPage&control=SetCommu
nity&CommunityID=209&PageID=418&r_folder=Models&r_title=CY7C65640-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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