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GROUP 14
SOURASISH CHAKRABORTY (2029117)
TUSHAR PAL (2029119)
PRABHAV MISHRA (2029137)
ABHISHEK KUMAR SINGH (2029156)
An arithmetic
logic unit (ALU) is a combinational digital circuit. It's part of a central processing unit that carries out arithmetic and logic operations on the operands in computer instruction words.
The ALU is divided into two units: an arithmetic unit (AU) and a logic unit (LU).
1. FIXED POINT OPERATIONS
2. FLOATING POINT OPERATIONS
FIXED POINT OPERATIONS
OR
XOR
NOT
L-SHIFT
R-SHIFT
ADD
ADD WITH CARRY ADD
SUBTRACT
MULTIPLY
SUBRACT WITH BORROW
FLOATING POINT OPERATIONS
F ADD F MUL
F DIV FSUB
CONCEPTUAL DIAGRAM OF ALU
DATA REGISTER
(DR)
ALU OUTPUT
CONTROL INPUT
ARITHEMATIC LOGIC UNIT (ALU)
ACCUMULATOR REGISTER
(AC)
A
ARITHMETIC
Y
LOGIC UNIT
B
S
A B
ARITMETIC
UNIT
Y
4: 1
MUX
LOGICAL
LOGICAL
UNIT
SELECT LINES
A B
SELECT LINES
OPERATIONS
CONNECTED TO MULTIPLEXER
FULL
ADDER
0
1
A+B
A-B
C
SELECT LINE
OPERATIONS
A B
C
O
N
N
E
C
T
E
D
T
O
M
U
L
T
I
P
L
E
X
E
R
011
100
101
AND
OR
NOT
OPERATIONS
SELECT LINES
In electronics, a multiplexer, also known as a data selector, is a device that selects between several analog or digital input signals and forwards the selected input to a single output line. The selection is directed by a separate set of digital inputs known as select lines.
000
001
010
011
100
101
110
111
0
A+B
A-B
A&B
A|B
~A
NOP
NOP
(1)
https://whatis.techtarget.com/definition/arithmetic-logic-unit-ALU
(2)
https://youtu.be/IPnYBgCmTCA
(3)
https://youtu.be/VgSbiNRIpic
(4)
https://youtu.be/0Pbw-GS7-x0