An integrated circuit includes a phase-locked-loop with fast clock
synchronization recovery. A phase frequency detector is configured to
receive a system clock signal and a feedback clock signal and to generate
a comparison signal. A clock generator is configured to general a first
clock signal based on the comparison signal, and an internal clock
signal. A controller coupled to the clock generator and configured to
deliver a mesh clock signal to a global clock mesh. A synchronizer
coupled to the control logic and configured to generate a feedback clock
signal to the phase frequency detector. The mesh clock signal is provided
from the global clock mesh to the synchronizer. Advantages of the
invention include the ability to operate the integrated circuit in a
sleep state with a slow clock rate and then quickly recover to an
operational clock rate.