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ALUs

ALUs. Topics: ALU Overview - core of the integer datapath - 2 operands, 32-bits wide, plus control signals Exercise: A simple multiplier. Arithmetic Logic Unit. Arithmetic Logic Unit (ALU) Implements add, sub, or, and, shift-left , right-shift … Computes many results in parallel

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ALUs

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  1. ALUs

  2. Topics: • ALU Overview • - core of the integer datapath • - 2 operands, 32-bits wide, plus control signals • Exercise: A simple multiplier

  3. Arithmetic Logic Unit • Arithmetic Logic Unit (ALU) • Implements add, sub, or, and, shift-left, right-shift … • Computes many results in parallel • Control mux selects desired output from among all potential results +/– A B

  4. add/sub : see lecture • and, or, xor, … : trivial • comparisons : left for students • putting it all together (e.g. mapping alu OP input to needed control signals): kmaps, etc. •  book is helpful (Appendix C)

  5. Binary Multiplication • via shifting for powers of 2 • with an expensive simplistic circuit • see hint.doc

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