This paper focuses on the implementation and simulation of 4-bit, 8-bit and 16-bit carry look-ahead adder based on Verilog code and compared for their performance in Xilinx.

The funny looking numbers are four bit hex (4’h1) and 7 bit binary (7’b1101101). So the code instructs the FPGA (or, more accurately, the Verilog compiler) to examine the number and set ...

This bit of code sets the reset line, holds it for 10 clock cycles, and then clears it. At the end of the test bench is a 400 cycle delay just to let the counters do something. Simulation Specifics ...