Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
2005-10-25
2005-10-25
Olms, Douglas (Department: 2661)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S356000, C711S105000
Reexamination Certificate
active
06959016
ABSTRACT:
A variable delay circuit is formed by a fine delay circuit and a coarse delay circuit. The fine delay circuit adjusts the delay of a delayed clock signal in relatively small phase increments with respect to an input clock signal. The coarse delay circuit adjusts the timing of a digital signal in relatively large phase increments. The delayed clock signal is used to clock a register to which the digital signal is applied to control the timing a the digital signal clocked through the register responsive to adjusting the timing of the fine delay circuit and the coarse delay circuit. The timing relationship is initially adjusted by altering the delay of the fine delay circuit. Whenever the maximum or minimum delay of the fine delay circuit is reached, the coarse delay circuit is adjusted. The variable delay circuit may be used in a memory device to control the timing at which read data is applied to the data bus of the memory device. The fine delay circuit includes a multi—tapped delay line coupled to a multiplexer that selects one of the taps for use in generating the delayed clock. When the first or last tap is selected, the timing of the coarse delay circuit is adjusted. The coarse delay circuit includes a counter that generates the digital signal upon counting from an initial count to the terminal count. The coarse delay circuit is adjusted by adjusting the initial count of the counter.
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pate
Keeth Brent
Manning Troy A.
Dorsey & Whitney LLP
Micro)n Technology, Inc.
Olms Douglas
Pizarro Ricardo M.
LandOfFree
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