Semiconductor integrated circuit with clock generator

Details Semiconductor integrated circuit with clock generator Semiconductor integrated circuit with clock generator

2006-11-16

2008-11-04

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S044000, C331S017000

Reexamination Certificate

active

07446615

ABSTRACT:
A semiconductor integrated circuit is provided with an external interface circuit, which includes a clock generation circuit for generating a synchronous clock signal to establish synchronization between data input and output through input and output of a data string sectioned at fixed intervals. The clock generation circuit includes a self-excited oscillator circuit serving as an oscillation source for the synchronous clock signal, and a control circuit for trimming the oscillation frequency of the self-excited oscillator circuit. The control circuit detects the sections made at the fixed intervals to the data string, measures the section interval based on an oscillation output of the self-excited oscillator circuit, and controls the oscillation frequency of the self-excited oscillator circuit to match the measurement value to a target value. With such a structure, any required frequency can be oscillated in a self-excited manner using a data string sectioned at fixed intervals using SOF packets or others instead of an oscillator.

REFERENCES:
patent: 6154095 (2000-11-01), Shigemori et al.
patent: 2002/0062457 (2002-05-01), Kamihara
patent: 2004/0222856 (2004-11-01), Hein et al.
patent: 2001-230837 (2001-08-01), None
patent: 2002-141911 (2002-05-01), None

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