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The Kogge-Stone adder is a parallel prefix adder. It will have a generate and the propagate signals. Area and power are compromised at the cost of fast computation. Logic depth is reduced in this module. It overcomes the disadvantages of a carry propagate delay in regular ripple carry adder.
This operator works on the generate and propagate pairs as defined by,
(gL, pL) (gR, pR) = (gL + pL gR, pL pR)
An 8-bit Kogge-Stone adder :
8 :Generate and propagate (GP) blocks
8: Black cells (BC) blocks
8: Gray cell (GC) blocks
9:Sum blocks.
Reader can refer to any standard papers for the top module design.
Verilog Code :
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