Equation 9 · Part 1 · When the Substrate Became the Product
Symbol V_sw
What this part means
the signalling swing.
Its job in the formula
w is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol V_sw→Article meaning
Where the article explains it
where collects driver, receiver, bump and pad capacitance, is capacitance per unit length of the conductor, is the reach, and is the signalling swing.
The passage around this formula
where collects driver, receiver, bump and pad capacitance, is capacitance per unit length of the conductor, is the reach, and is the signalling swing. Two assumptions are doing the work and both deserve stating. First, this treats the link as a lumped capacitance rather than a transmission line — reasonable for a few millimetres of on-package wire at moderate rates, wrong once the link is long or fast enough to need equalisation, retiming and serialisation, at which point the fixed circuit overhead dominates and the linear term stops being the whole story. Second, it ignores clocking and idle power, which for real links are not negligible.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the article section
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