Xguff is a basic framework for communicating between an FPGA and a Cypress FX2 USB chip, tested on an Avnet Virtex4LX25 evaluation board, and an in-house custom Spartan3 board.
This package is condensed and modified from the USRP project, in particular a CVS snapshot from September 8, 2005. More precisely, this is the USRP component of GnuRadio.
The title "xguff" is an attempt at a short, almost-pronounceable acronym that is easy to find via Google. Would you believe "Xperimental Gnu USB FPGA Framework"?
Download source code, a gzipped tarball. (older copy)
Larry Doolittle
February 12, 2006