[usb] USB Core Update

[Rudolf Usselmann <rudi@asics.ws>]

I have updated the USB Core specification and depository:

1) Specification Changes

- Added USB device control flow charts
- Gave Names to Endpoint Registers
- Added Interrupt Section
- Added Suspend & Resume Section
- Added Appendix C: USB Core Structure
- Made various grammar and syntax corrections

The latest spec can be downloaded from:
http://www.opencores.org/cores/usb/usb_doc.pdf


2) Source Depository
- Added a block that deals with USB control signaling
  (Speed Negotiation, Suspend/Resume, Reset)
- Changed the revision numbers of all files to start at 1.0
  It appears it was impossible to download the sources because
  the initial revision was 0.1.

Easiest way to get a snapshot of the current release is to go to:
http://www.opencores.org/cvsmodule.shtml

Type in "USB" (without the quotes) for module name, and you should
get the entire source code.


This is still a development release - use it at your own risk !

Cheers,
rudi