Method and apparatus for clock synthesis using universal...

Details Method and apparatus for clock synthesis using universal... Method and apparatus for clock synthesis using universal...

2006-10-10

2006-10-10

Elamin, A. (Department: 2116)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

C713S401000, C713S500000, C713S501000, C713S502000, C713S503000, C713S600000, C713S601000

Reexamination Certificate

active

07120813

ABSTRACT:
In one form of the invention, a method for generating a local clock signal responsive to signals on a Universal Serial Bus (“USB”) includes generating a frequency-bearing clock signal by a free running oscillator on an integrated circuitry chip of a device coupled to the USB. The oscillator runs at a frequency that is substantially stable but initially known with substantial inaccuracy. A single ended bit-serial signal is extracted from received signals sent by a USB host or hub and timing signals are responsively asserted. A bit pattern is detected in the single ended bit-serial signal and intervals are measured during which the timing signals are asserted. The period P of the local clock signal is adjusted responsive to one of the measured intervals. In one variant, the initial inaccuracy is at least partly because the oscillator consists solely of circuitry on the chip.

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