Circuit for measuring signal delays in synchronous memory elements
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United States of America Patent
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May 15, 2001
Grant Date -
N/A
app pub date -
Jul 22, 1999
filing date -
Sep 17, 1996
priority date (Note) -
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Abstract
A circuit measures a signal propagation delay through a series of memory elements. In one embodiment the memory elements are configured in series so that together they form a delay circuit. In another embodiment the memory elements are configured in a loop to form a ring oscillator. Each memory element propagates a signal to a subsequent memory element so that the time the signal takes to traverse all of the memory elements is proportional to the average delay induced by the individual elements. This proportionality provides an effective means for measuring the delays of those components. Various embodiments of the invention measure the speeds at which memory elements can be preset, cleared, written to, read from, or clock enabled.
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