1.  DLD PRESENTATION
by
shams(178)
Nasrallah(106)
saleem(132)
younas(146)
Kawar(151)
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2. BINARY PARALLEL ADDER
• Binary Addition
• Half adder
• Full adder
• Parallel adder
• 4 – bit parallel adder
• 8 – bit parallel adder
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4. HALF ADDER
• A half adder is used to add two binary digits together, A and B. It produces S, the
sum of A and B, and the corresponding carry out Co.
• Although by itself, a half adder is not extremely useful, it can be used as a building
block for larger adding circuits (FA).
• One possible implementation is using two AND gates, two inverters, and an OR gate
instead of a XOR gate .
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7. FULL ADDER
• A full adder accepts two inputs and an
output carry and generates a sum
output and as an output carry.
• The basic difference between a half
adder and a full adder is that the full
adder accepts a input carry
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10. PARALLEL
ADDER
two or more full adders
Are connected to form
parallel binary adder
A binary parallel adder is
a digital function that
produces the arithmetic
sum of two binary
numbers in parallel.
A circuit, consisting of n
full adders, that will add
n-bit binary numbers.•
The output consists of n
sum bits and a carry bit.•
COUT of one full adder is
connected to CIN of the
next full adder.
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11. Parallel Adder
Diagrams
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12. 4 – BIT PARALLEL ADDER
• A group of four bits is called a nibble.
• A basic four bit parallel adder is implemented with four
full adders.
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13. LOGICAL DIAGRAM
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15. TRUTH TABLE
Cn-1
An Bn cn ∑n
0 0 0 0 0
0 0 1 0 1
0 1 0 0 1
0 1 1 1 0
1 0 0 0 1
1 0 1 1 0
1 1 0 1 0
1 1 1 1 1
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