AddersAdders

Full adder

4-bit ripple adder

Subtractor from adderSubtractor from adder

Carry look-ahead adderCarry look-ahead adder

Previous inputs are in this logic here to speed – up the carry propagation

74x283 4-bit 74x283 4-bit binary adderbinary adder

G and P bits go to all previous bits

74x283 4-bit binary adder74x283 4-bit binary adder

This chip is This chip is internally a internally a Carry look-Carry look-

ahead adderahead adder

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

ALUALU

74x181 4-bit ALU74x181 4-bit ALU

74x181 4-bit ALU

4-bit ALUs: 74X381 and 4-bit ALUs: 74X381 and 74x38274x382

74x381 and 74x382 ALUs74x381 and 74x382 ALUs

74x182 Lookahead Carry 74x182 Lookahead Carry CircuitCircuit

16-bit ALU 16-bit ALU using using group-group-carry carry

lookaheadlookahead

74x182 Lookahead Carry Circuit

74x381 ALU

Two ways to realize Two ways to realize Selectable AdditionSelectable Addition

Verilog for additionVerilog for addition

Verilog for adder sharing

Verilog continuous assignment statement

8-bit 8-bit 74x381-74x381-like ALUlike ALU

MultiplierMultiplier

Partial products in a 8*8 multiplier

Interconnections for a 8*8 multiplier

A Faster A Faster variant of a 8*8 variant of a 8*8 combinational combinational multipliermultiplier

Verilog for 8*8 combinational multiplier

Behavioral Behavioral Verilog 8*8 Verilog 8*8 multipliermultiplier

Verilog variable names for a 8*8 multiplier

Structural Structural Verilog for a Verilog for a 8*8 8*8 combinational combinational multipliermultiplier

Verilog testbench for a 8*8 combinational multiplierVerilog testbench for a 8*8 combinational multiplier