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Spare cell means for future design modification use.
When circuit designers are designing the circuit, they will expect some margin and try to put spare cells. Layout engineers also will put those spare cells in the layout and make them as dummies or floating.
Once whenever some modification is required, They will use that spare cell and try to pass the design. This mainly for the layout engineer feeasibility. When modification is required he need not to work more. just need to give connections. Correct if I am wrong.
Thank You.
Spare cells are additional cells that can be used if ECO cells are not available. These cells have floating outputs. And if netlist is wrong and requires modification, EDA tool will replace these cells with required cells according to the matching footprint....
As posted before, spare cells are, as the name indicates, spare components placed in the design for possible future use.
This allow you to change some circuit funtion by connecting them on a future silicon run.
Main layout consideration about them is to make sure you'll be able to use them by changing THE LESS QTY OF MASKS (for instance, doing ONLY a METAL UP change)
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