Frequency comparison and generation in an integrated processor

Details Frequency comparison and generation in an integrated processor Frequency comparison and generation in an integrated processor

1997-09-26

2000-06-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Regenerating or restoring rectangular or pulse waveform

327 42, 327 46, 331 11, H03K 501

Patent

active

060811439

ABSTRACT:
An integrated processor includes a microprocessor core and a bus interface unit. The integrated processor receives a reference clock signal and an external clock signal. The frequency of the reference clock signal is compared to the frequency of the external clock signal. Based upon this comparison, the appropriate frequency for the internal clock signal that controls the bus interface unit is determined. A clock generation circuit, such as a phase-locked loop, generates the appropriate frequency for the internal clock signal based upon the comparison of the reference clock signal and external clock signal.

REFERENCES:
patent: 4743864 (1988-05-01), Nakagawa
patent: 4745371 (1988-05-01), Haine
patent: 4812783 (1989-03-01), Honjo
patent: 5061882 (1991-10-01), Takagi
patent: 5202906 (1993-04-01), Saito
patent: 5714896 (1998-02-01), Nakagawa

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