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The Counting Bloom Filter (CBF) is useful for real time applications where the time and space efficiency is the main consideration in performing a set membership tests. The CBF estimates whether an element is present in a large array or not by allowing false positives and by not permitting false negatives. In this paper CBF architecture is analyzed and has been implemented. There are two approaches of CBF, SRAM based approach using up/down counters and the LCBF using up/down LFSR unit. In this paper the LCBF architecture discussed and analyzed. In the latest VLSI technology it is easy to fabricate memories that hold a few million bits of data and addresses.
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