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In page Sum-addressed decoder:

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Each row of each decoder for each of two banks implements a set of full adders which reduce the three numbers to be added (R[13:3], O[13:3], and L) to two numbers (S[14:4] and C[13:3]). The LSB (==S[3]) is discarded. Carry out (==C[14]) is also discarded. The row matches if S[13:4] == ~C[13:4], which is &( xor(S[13:4], C[13:4])).