On 07/30/11 10:24 am, Oliver Seitz wrote:
I'm no USB expert, but I know that USB does have quite strict timing. Wikipedia says: Clock tolerance is 480.00 Mbit/s ą500 ppm <http://en.wikipedia.org/wiki/Parts_per_million>, 12.000 Mbit/s ą2500 ppm, 1.50 Mbit/s ą15000 ppm. If I'm converting it right, that's 0,05% for 480MBit/s, 0,25% for 12MBit/s and 1,5% for 1.5Mbit/s.
So full speed USB requires a pretty accurate crystal (or is that a 'normal' accuracy for ordinary crystals?).
Regards, Rob. -- R. Hamerling, Netherlands --- http://www.robh.nl -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
