[Open-graphics] A really good immediate use for OGD1: PCI bus analyzer

[Robert Fitzsimons]

> Later, we should consider figuring out how to do USB 1.1.  The "Full
> Speed" 12 megabit data rate won't be a problem on the I/O's, but the
> protocol will surely be a challenge to implement.  Also, with really
> clever logic, we MIGHT be able to do the 480MHz for USB 2.0, although
> I don't think we'll really need it.  The approach to examining
> recorded bus activity should be to download on demand, rather than try
> to download the whole buffer at once.

There seems to be a number of small Physical Layer IC's available which
implement the USB Transceiver Macrocell Interface (UTMI).  For example:

SMSC: Small Footprint Hi-Speed USB 2.0 Device PHY with UTMI Interface
http://www.smsc.com/main/catalog/usb3290.html

Cypress Semiconductor: MoBL-USB(TM) TX2 USB 2.0 UTMI Transceiver
http://www.cypress.com/portal/server.pt?space=CommunityPage&control=SetCommunity&CommunityID=209&PageID=259&fid=285&rpn=CY7C68000A&ref=pfm

I was thinking it should be possible to come up with a small adapter
that uses one of these IC's.  The adapter could then be soldered on to
one of the Sil178 pads.

So we'd also need an implementation of UTMI/SIE (from opencores?) and
application endpoints in the FPGA, and client application using libusb
to communicate with the card.

Robert