Verilog module of a 4-bit Ripple Carry Adder The carry out, C out provides a carry-bit, if another instance of the ripple carry adder is cascaded towards more significant stage.įigure 2. The 4-bit sum generated by the adder is presented in the 4-bit output port Sum and 1-bit carry-out in the C out output port. The 1-bit carry-in input port C in is used to read in a carry bit, if another instance of the ripple carry adder is cascaded towards lesser significant stage. A and B are the two 4-bit input ports which is used to read in the two 4-bit numbers that are to be summed up. 4-bit Carry Ripple Adder formed by cascading four full addersįigure 2 shows the Verilog module of a 4-bit carry ripple adder. A 4-bit ripple carry adder formed by cascading four 1-bit full adders is shown in Figure 1.įigure 1. The layout of a ripple-carry adder is simple, which allows for fast design time however, the ripple-carry adder is relatively slow, since each full adder must wait for the carry-bit to be calculated from the previous full adder. This kind of chain of adders forms a ripple-carry adder, since each carry-bit " ripples" to the next full adder. Each full adder takes a carry-in C in, which is the carry-out C out of the previous adder. A N-bit full adder can be designed by cascading N number of 1-bit full adders.
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