Electrical computers and digital processing systems: support – Clock – pulse – or timing signal generation or analysis
Reexamination Certificate
2006-05-30
2006-05-30
Browne, Lynne H. (Department: 2116)
Electrical computers and digital processing systems: support
Clock, pulse, or timing signal generation or analysis
C375S357000, C327S144000, C327S141000, C327S142000
Reexamination Certificate
active
07055051
ABSTRACT:
The clock switch device of the present invention includes: a clock detector for receiving a plurality of clocks and clock selection data designating a clock to be selected, detecting whether or not the clock designated by the clock selection data among the plurality of clocks changes in signal level, and outputting the result as a detection signal; a control register for holding and outputting the clock selection data when the detection signal indicates that the clock designated by the clock selection data changes in signal level; and a selector for receiving the plurality of clocks and selecting a clock corresponding to the output of the control register among the plurality of clocks.
REFERENCES:
patent: 4899351 (1990-02-01), Bonke
patent: 5479648 (1995-12-01), Barbera et al.
patent: 5790609 (1998-08-01), Swoboda
patent: 6158012 (2000-12-01), Watts, Jr.
Tanenbaum, Andrew S., Structured Computer Organization, 1984, Prentice-Hall, Inc., 2ndEdition, p. 11.
Browne Lynne H.
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
Patel Anand B.
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