Objectives To design an 8 bit ALU An Arithmetic unit does the following task Addition Addition with carry Subtraction, Subtraction with borrow, Decrement Increment Transfer function A Logic unit does the following task Logical AND Logical OR Logical XOR Logical NOT operation Shift right Shift left The ALU circuit provides eight arithmetic operation, four logic operations, and two shift operations Each operation is selected with the five variables S 3 , S 2 , S 1 , S 0 , and Cin The input carry Cin is used for selecting an arithmetic operation only Function of ALU begin tabular c c c c c c l hline ( mathbf S mathbf 3 ) ( mathbf S mathbf 2 ) ( mathbf S mathbf 1 ) ( mathbf S mathbf 0 ) ( mathbf C mathbf i ) Result multicolumn 1 c Operation hline 0 0 0 0 0 ( boldsymbol A boldsymbol B ) Addition hline 0 0 0 0 1 ( boldsymbol A boldsymbol B boldsymbol 1 ) Addition with carry hline 0 0 0 1 0 ( boldsymbol A overline boldsymbol B ) Subtraction with borrow hline 0 0 0 1 1 ( boldsymbol A overline boldsymbol B mathbf 1 ) Subtraction hline 0 0 1 0 0 ( boldsymbol A boldsymbol 1 ) Decrement hline 0 0 1 0 1 ( boldsymbol A ) Transfer hline 0 0 1 1 0 ( boldsymbol A ) Transfer hline 0 0 1 1 1 ( boldsymbol A boldsymbol 1 ) Increment hline 0 1 0 0 x ( boldsymbol A cdot boldsymbol B ) AND hline 0 1 0 1 x ( boldsymbol A boldsymbol B ) OR hline 0 1 1 0 x ( boldsymbol A boldsymbol oplus boldsymbol B ) XOR hline 0 1 1 1 x ( boldsymbol N O T boldsymbol A ) Complement hline 1 0 0 x x ( boldsymbol L S R boldsymbol A ) Logical Shift Right hline 1 0 1 x x ( boldsymbol L boldsymbol S boldsymbol A ) Logical Shift Left hline end tabular

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Question: Objectives: To design an 8 - bit ALU An Arithmetic unit does the following task: Addition Addition with carry Subtraction, Subtraction with borrow, Decrement Increment

Objectives: To design an

8 -

bit ALU An Arithmetic unit does the following task:

Addition

Addition with carry

Subtraction,

Subtraction with borrow,

Decrement

Increment

Transfer function. A Logic unit does the following task:

Logical AND

Logical OR

Logical XOR

Logical NOT operation.

Shift right

Shift left The ALU circuit provides eight arithmetic operation, four logic operations, and two shift operations. Each operation is selected with the five variables S

3,

2,

1,

0,

and Cin. The input carry Cin is used for selecting an arithmetic operation only. Function of ALU

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Operation

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0

0

0

0

0

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& Addition

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hline

0

0

0

0

1

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& Addition with carry

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1

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& Subtraction with borrow

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1

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& Subtraction

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0

0

1

0

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& Decrement

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hline

0

0

1

0

1

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& Transfer

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0

0

1

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& Transfer

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& Increment

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& AND

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& OR

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& XOR

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N O T

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& Complement

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1

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L S R

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& Logical Shift Right

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& Logical Shift Left

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end

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tabular

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