Date : 22/10/2015Ex No : 10SHASHANK14BEE0174L41+42D DESIGN AND VERIFICATION OF 4 BIT BINARY UP/DOWNCOUNTER WITH LOAD ENABLEAIMTo verify the operation of 4bit binary up/down counter using verilog.APPARATUS REQUIREDXilinx ISE 12.1 Software.THEORY:The sequence of states may follow the binary number sequence or other sequence of states. Acounter that follow the binary number sequence is called a binary counter. A n- bit binarycounter consist of n flip flop and can count in binary from 0 through 2n-1.Counter are available in two categories: ripple counter and synchronous counter. In ripplecounter, a flip-flop output transition serves as a source for triggering other flip-flop In otherword ,the C input of some or all flip-flop are triggered, not by the common clock pluses ,butrather by the transition that occurs in other flip-flop output. In synchronous counter, the Cinput of all flip-flop rceive the common clock.