13.3.4.3. Wire sizing for clock nets
In this section, we deal with the problem of assigning appropriate widths to wires in a clock tree to minimize the clock skew, the clock delay, and the sensitivity of the clock tree to process variations. The constraint on the maximum width of a wire is typically imposed by the available routing resources, whereas the constraint on the minimum wire width depends on the fabrication technology. Moreover, the maximum allowable current density through a wire also provides a lower bound for the wire width, so that the wire can withstand the wear-out phenomenon caused by electromigration. Note that a long wire may be divided into several segments, and each segment may have different upper and lower bounds.
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