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A lookahead carry unit (LCU) is a logical unit in digital circuit design used to decrease calculation time in adder units and used in conjunction with carry look-ahead adders (CLAs). 4-bit adder [ edit ]
Accordingly, before the carry emerges from the next group, the lookahead unit is immediately (within one gate delay) able to tell the next group to the left that it is going to receive a carry – and, at the same time, to tell the next lookahead unit to the left that a carry is on its way.
look-ahead carry generator, selectable carry inputs 20 SN74AS282: 74x283 1 4-bit binary full adder (has carry in function) 16 SN74LS283: 74x284 1 4-bit by 4-bit parallel binary multiplier (high order 4 bits of product) 16 SN74284: 74x285 1 4-bit by 4-bit parallel binary multiplier (low order 4 bits of product) 16 SN74285: 74x286 1
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Am2901 4-bit-slice ALU (1975); Am2902 Look-Ahead Carry Generator; Am2903 4-bit-slice ALU, with hardware multiply; Am2904 Status and Shift Control Unit; Am2905 Bus Transceiver; Am2906 Bus Transceiver with Parity
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