Clock synchronization method
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United States of America Patent
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Feb 20, 2018
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N/A
app pub date -
Feb 16, 2016
filing date -
Feb 16, 2015
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Abstract
The first synchronous FF is disposed at the starting point of the clock tree of the frequency-divided clock of each lower hierarchical block, and the first maximum delay time of the reference clock from the branch point of the reference clock and the frequency-divided clock to the first synchronous FF is acquired. The second maximum delay time of the reference clock between adjacent two of second synchronous FFs is determined so as to be less than half the period of the reference clock. The number of stages of the second synchronous FFs is determined according to the first and second maximum delay times. The target delay time from the branch point is determined so as to be not more than the second maximum delay time, and the second synchronous FF and a latch are disposed so as to achieve the target delay time.
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