Synchronizing timing domains based on state variables

Details Synchronizing timing domains based on state variables Synchronizing timing domains based on state variables

2008-09-25

2011-10-18

Myers, Paul (Department: 2111)

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

Reexamination Certificate

active

08041981

ABSTRACT:
Embodiments of a synchronization circuit, a method for synchronizing clock signals, and electronic devices that include the synchronization circuit or a computer-program product (e.g., software) with instructions for operations in the method are described. This synchronization circuit synchronizes clock signals in different timing domains using state variables. In particular, the synchronization circuit generates a synchronization acquisition curve based on a temporal history of state-variable differences between the clock signals. Next, the synchronization circuit synchronizes the clock signals (without a discontinuous temporal transient in one or more state variables of a dependent one of the clock signals) based on the sum of the synchronization acquisition curve and the state-variable differences between the clock signals. This state variable may include: a phase of the dependent clock signal, a frequency of the dependent clock signal, and/or a rate of change of the frequency of the dependent clock signal.

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