Adders.

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Presentation transcript:

Adders

Full adder

4-bit ripple adder

Subtractor from adder

Carry look-ahead adder Previous inputs are in this logic here to speed – up the carry propagation

74x283 4-bit binary adder G and P bits go to all previous bits

This chip is internally a Carry look-ahead adder 74x283 4-bit binary adder This chip is internally a Carry look-ahead adder

16-bit group-ripple adder built from 74X283 Adders

ALU

74x181 4-bit ALU

74x181 4-bit ALU

4-bit ALUs: 74X381 and 74x382

74x381 and 74x382 ALUs

74x182 Lookahead Carry Circuit

16-bit ALU using group-carry lookahead 74x182 Lookahead Carry Circuit 74x381 ALU 16-bit ALU using group-carry lookahead

Two ways to realize Selectable Addition

Verilog for addition

Verilog for adder sharing

Verilog continuous assignment statement

8-bit 74x381-like ALU

Multiplier

Partial products in a 8*8 multiplier

Interconnections for a 8*8 multiplier

A Faster variant of a 8*8 combinational multiplier

Verilog for 8*8 combinational multiplier

Behavioral Verilog 8*8 multiplier

Verilog variable names for a 8*8 multiplier

Structural Verilog for a 8*8 combinational multiplier

Verilog testbench for a 8*8 combinational multiplier