The document outlines a project focused on designing a 32-bit Carry Select Adder (CSA) in Verilog RTL, aimed to operate at 4 GHz. It describes the construction of the CSA using 4-bit Carry Lookahead Adders and multiplexers for efficient carry and sum selection. Additionally, it discusses the simulation, synthesis, and physical design aspects of the adder.

1. A Project On VLSI Laboratory
Name of the project:
Verilog RTL for a 32-bit Carry
Select Adder (CSA)
To: Mr. Salahuddin Ahmed (Lecturer)
By: Md. Aman Ullah
Id: 021132091

2.  An adder is a digital circuit that performs addition of
numbers.
 In processor it is used to calculate addresses, table indices,
and similar operations.
 It can be constructed for many numerical representations,
the most common adders operate on binary numbers.
ADDER MEANS???

3. Objectives:
 Write Verilog RTL for a 32-bit Carry Select Adder (CSA) that runs at 4GHz.
Simulate, synthesize and physical design of that adder
 Directions below to create the 32-bit CSA
 A 4-bit Carry Look Ahead (CLA) adder
 Combine 8-stages of the CLA adder to create the 32-bit CSA
 Use 4-bit 2-to-1 mux to choose the sum from each set of CLA
 Use 1-bit 2-to-1 mux to select the carry for the next stage

4. Carry Look ahead adder:
CLA is a type of adder using in digital logic.
A carry look ahead adder improves speed
by reducing amount of time required to
determine carry bits.
 A carry-lookahead adder (CLA) or fast
adder is a type of adder used in digital
logic.
 A carry-lookahead adder improves
speed by reducing the amount of time
required to determine carry bits.

5. Carry Look ahead adder:


6.  A carry-select adder is a particular way to implement
an adder, which is a logic element that computes the -bit
sum of two -bit numbers. The carry-select adder is simple
but rather fast.
Carry Select Adder

7. Carry Select Adder
44
4
C3
44
4
44
4
4-bit 2to1 MUX
4
C (1)
C (0)
S3 ~ S0
A3 ~ A0 B3 ~ B0
S7 ~ S4
C0●
A7 ~ A4 B7 ~ B4
A7 ~ A4 B7 ~ B4
1-bit 2to 1 MUX

8. MULTIPLEXER(MUX):
A multiplexer (or mux) is a device that selects one of
several analog or digital input signals and forwards the
selected input into a single line

9. Simulation Output:

10. Synthesis: Report Timing

11. Report Timing:

12. Report Power:

13. Physical Design

14. Setup Mode:

15. Thank You