Semiconductor integrated circuit having delay locked loop...

Details Semiconductor integrated circuit having delay locked loop... Semiconductor integrated circuit having delay locked loop...

2009-12-29

2011-12-27

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

08085072

ABSTRACT:
A semiconductor integrated circuit is provided. The semiconductor integrated circuit includes: a delay locked loop (DLL) output block configured to delay an input clock signal by a predetermined time in response to a plurality of delay control signals and provide a DLL clock signal; a locking control block configured to compare a phase of a reference clock signal and a phase of a feedback clock signal, and synchronize the phase of the reference clock signal and the phase of the feedback clock signal in response to the plurality of delay control signals; and a locking detection block configured to detect whether the phase of the reference clock signal and the phase of the feedback clock signal are synchronized and the DLL clock signal is locked, wherein, when the DLL clock signal is locked, the locking control block provides the reference clock signal, which is obtained by dividing the input clock signal by n (where n is a natural number equal to or greater than 2), as an internal DLL clock signal.

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