Aim:-Implementation of up counter, down counter and up-

down counter.

Brief Introduction:- In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in

relationship to a clock signal. We have a different types of counter like up counter ,down counter

and up-down counter, which are used in the different applications according to the requirement.

1)Up Counter:-

Programme Code:-

module upc(q, clk,rst);

output reg [3:0] q;

input clk;

input rst;

always@(posedge clk or rst)

begin

if(rst)

q

Output Waveform:-

2)Down Counter:-

Programme Code:-

module dwncntr(q, clk,rst);

output reg [3:0] q;

input clk;

input rst;

always@(posedge clk or rst)

begin

if(rst)

q

output reg [3:0] q;

input clk;

input rst;

input c;

always@(posedge clk or rst or c)

begin

if(rst)

q

Learning Outcomes:- In this practical I have implemented the up, down and up-

down counter. So I learnt that how to write the verilog code to count the

particular pulses on the Xilinx software