[SI-LIST] Problem with Cypress CY7C65640 USB Hub IBIS model
- From: Joel Brown <joel@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 10 Mar 2006 11:45:53 -0800
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=SetCommunity&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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