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library ieee;

use ieee.std_logic_1164.all;

entity 3bitrc is

port(

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Q: Vhdl program for a 3 bit ripple counter using flip flops?
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An up counter is simply a digital counter which counts up at some predefined increment. A Binary Up Counter with 'n' stages can count up to 2n states.If we are implementing Up Counter with flip flops, this 'n' stages becomes the number of flip flops. For example a 4 bit Up Counter can count from binary 0000 to 1111, i.e 24=16 states.A detailed design and working animation of of Binary Up Counter is given in the related link section below


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Design 3 bit ripple counter using JK flip flops?

I am not a Electronic Engineer, so probably any expert out there can correct me if I am thinking wrong.--------- As you can see below there is something common between JK and SR flipflop i.eThe JK flip-flop augments the behavior of the SR flip-flop by interpreting the S = R = 1 condition as a "flip" or toggle command. Specifically, the combination J = 1, K = 0 is a command to set the flip-flop; the combination J = 0, K = 1 is a command to reset the flip-flop; and the combination J = K = 1 is a command to toggle the flip-flop, i.e., change its output to the logical complement of its current value. Setting J = K = 0 does NOT result in a D flip-flop, but rather, will hold the current state. To synthesize a D flip-flop, simply set K equal to the complement of J. The JK flip-flop is therefore a universal flip-flop, because it can be configured to work as an SR flip-flop, a D flip-flop or a T flip-flop. NOTE: The flip flop is positive edge triggered (Clock Pulse) as seen in the timing diagram.even in the picture they Put SR/RS embeded, that mens JK can work like SR too. I will use this diagram to draw ripple counter. You may note similarity in input output combination too...RS table* We can summarize the operation of the RS-flipflop by the following truth table.R S Q Q' Comment 0 0 Q Q' Hold state 0 1 1 0 Set 1 0 0 1 Reset 1 1 ? ? AvoidJktableand the corresponding truth table is: J KQnext Comment 0 0 hold state 0 1 reset 1 0 set 1 1 toggleDoes that mean we use below coutner 'using 4 bit ripple counter using JK flip flops' as 4 bit ripple counter for RS flip flop too? at the max output states would differ only when both SR/JK is 1 1 ?Figure 1. A Simple Ripple Counter Consisting of J-K Flip-flopsMethod1: You will find answer here: http://www2.cs.uh.edu/~jhuang/JCH/LD/chap07.htmlHere you see how to create ripple counter using RS flip flop. Method 2: create a Toggle function in RS flip flop, then use it in place of typical jk flip flop ripple couters.


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