ALU design and datapath
Computer Organization and Architecture · Engineering
CPU chip explorer
Interactive 3DLook inside a processor — data packets race between ALU, cache and control unit.
Controls
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Study notes
Build a 4-bit adder from full adders: each takes a_i, b_i, carry_in; outputs sum_i and carry_out. Ripple the carry: bit 0's carry_out feeds bit 1. Adding 0111+0001: carries ripple 1->1->1->1, sum 1000. Slow for 64 bits (64 gate delays); carry lookahead computes carries in parallel with generate/propagate logic.