Synchronous clock generator including delay-locked loop

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United States Patent

5920518

Link to this page

http://www.wikipatents.com/5920518.html

Inventor(s)

Harrison; Ronnie M. (Boise, ID); Keeth; Brent (Boise, ID)

Abstract

A data and command latching circuit includes a delay-locked loop driven by a continuous reference clock signal that generates a delayed output clock signal having a delay controlled by the delay-locked loop. The latching circuit also includes a variable delay circuit external to the delay-locked loop that is driven by a discontinuous reference clock signal. Delay of the external delay circuit is controlled by a control voltage output from the delay-locked loop, so that the delays of the external delay circuit are determined with reference to the continuous reference clock signal. The delayed clock signals from the delay-locked loop activate control data latches to latch control data arriving at the latch circuit. The delayed signals from the variable voltage circuit activate data latches to latch data arriving at the latch circuit.

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