16 Bit Ripple Carry Adder Verilog Code. Following is the Verilog code for the 4bit ripplecarry adder Now it’s time to run a simulation to see how it works In this Verilog project let’s use the Quartus II Waveform Editor to create test vectors and run functional simulations without a Verilog testbench If you want to learn how to run the simulation without a Verilog testbench.
Verilog Code for Ripple Carry Adder using Structural Level Ripple carry adder (RCA) is the most basic form of digital adder for adding multi bit numbers The adder is implemented by concatenating N fulladders to form a Nbit adder For a 4 bit RCA the block diagram can be drawn like this I have used the full adder and half adder modules written in a previous post to.
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PDF fileCarry Select Adder Example 8bit Adder It is composed of 3 sections of one 4bit and two fourbit ripple carry adders Both sum and carry bits are calculated for the two alternatives of the input carry “0” and “1” MUX MUX.
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Example 3 TwoBit Ripple Carry Adder in Verilog Note that the ripple carry adder output (o_result) is one bit larger than both of the two adder inputs This is because two N bit vectors added together can produce a result that is N+1 in size For example b”11″ + b”11″ = b”110″ In decimal 3 + 3 = 6.
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Verilog code for Carry Save Adder with Testbench Carry save adder is very useful when you have to add more than two numbers at a time Normally if you have three numbers the method would be to add the first two numbers together and then add the result to the third one.
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In a 32bit ripplecarry adder there are 32 full adders so the critical path (worst case) delay is 3 (from input to carry in first adder) + 31 * 2 (for carry propagation in later adders) = 65 gate delays 1 bit Ripple carry adder had 1 full adder Therefore 16 bit Ripple carry adder has 16.