What are spare cells and why they are used ?
Spare cells are nothing but the
bunch of cells(AND,NAND,OR,NOR, flops etcs) placed in the entire design
by maintaining the uniform distance. Wen a bug is found after the chip
tapeout and suppose we need to fix that by
adding one buffer or any other cell than we can use the cells from
these spare cells bunch and do the net connections. AS we are not
disturbing the base layer it will save the mask cost.
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