Dynamic clock switch mechanism for memories to improve...

Electrical computers and digital processing systems: memory – Storage accessing and control – Access timing

Reexamination Certificate

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Reexamination Certificate

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07606991

ABSTRACT:
This invention improves cache operation by dynamically extending one state of a clock signal supplied to a cache on operation cycles when a cache fill operation will occur. The dynamic extension of the clock signal includes delaying the clock signal, forming a waveform toggling between states upon each predetermined state transition of the delayed clock signal, selecting the clock signal when this waveform has a first stage, and selecting the delayed clock signal when this waveform has a second state. Dynamic extension is prevented during a test mode. An apparatus of this invention uses a flip-flop and a multiplexer to produce the dynamically delayed clock.

REFERENCES:
patent: 5651130 (1997-07-01), Hinkle et al.
patent: 5829021 (1998-10-01), Yamamoto et al.
patent: 6803783 (2004-10-01), Zhu et al.
patent: 7243244 (2007-07-01), Yoshitomi et al.
Spohrer, T.; Marquette, D.; Gallup, M., “Test architecture of the Motorola 68040,” Computer Design: VLSI in Computers and Processors, 1990. ICCD '90. Proceedings., 1990 IEEE International Conference on , vol., No., pp. 191-194, Sep. 17-19, 1990 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=130199&isnumber=3623.

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