Baud rate?

[Paul Martin]

On Sat, Jul 07, 2012 at 01:02:45PM -0700, Liam D. Gray wrote:
> On Fri, Jul 6, 2012 at 4:06 AM, Daniel Silverstone
> <dsilvers at digital-scurf.org> wrote:
> > On Fri, Jul 06, 2012 at 03:29:39AM -0700, Liam D. Gray wrote:
> >> The Entropy Key emulates a USB CDC serial port.  What is the baud
> >> rate, or which baud rates are possible?
> >
> > The USB actually always runs at the same rate, and the key always generates
> > packets at the same rate.
> 
> Let me put it this way: Full rate for USB 1.1, apparently used here,
> is 12 Megabits per second.  But a device has the option to fill any
> portion of the channel capacity, from zero to 100%.  So at what rate
> does Entropy Key send entropic bits into the 12Mbit/sec channel?  This
> determines how quickly my receive buffer will fill up after each time
> I tell Entropy Key to start sending.

It'll probably be less than 48kbps equivalent (including all the
framing), varying depending on the quality of the entropy generated by
the sources at that instant.

-- 
Paul Martin <pm at simtec.co.uk>
Simtec Electronics         Tel: +44 1772 978010
http://www.simtec.co.uk/   Fax: +44 1772 816426