Electronic digital logic circuitry – Having logic levels conveyed by signal frequency or phase
Reexamination Certificate
2005-09-27
2005-09-27
Tran, Anh Q. (Department: 2819)
Electronic digital logic circuitry
Having logic levels conveyed by signal frequency or phase
C327S276000, C327S277000, C327S284000
Reexamination Certificate
active
06949956
ABSTRACT:
A logic circuit for delaying a signal input thereto a specified number of clock cycles X, wherein X is between 1 and 2Nis described. In one embodiment, the logic circuit comprises a demultiplexer (“DEMUX”) comprising an input for receiving the signal and N outputs; a register array comprising 2Nclocked registers, wherein each of a first N of the clocked registers is connected to one of the N outputs of the DEMUX and wherein data is shifted out of one clocked register to a next clocked register on each clock cycle; and a multiplexer (“MUX”) comprising M inputs, wherein each of the M inputs is connected to one of the clocked registers.
REFERENCES:
patent: 6281728 (2001-08-01), Sung
Bart Vermeulen and Sandeep Kumar Goel, “Design for Debug: Catching Design Errors in Digital Chips”, IEEE Design & Test of Computers; May-Jun. 2002; pp. 37-45.
Affidavit of Richard W. Adkisson, Feb. 17, 2005, 4 pages.
Hewlett--Packard Development Company, L.P.
Tran Anh Q.
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