Question and answers:- Where every question is asked and answered by community and the best question and answers are voted up so the visitors will get the best answers. Show how a D flip flop converted into JK flipflop?ĭesign a mode 5 counter using T flip flop Write a short note on clocked RS Flip - Flop. Give the difference between Latch and Flip Flop. Replication capabilities in MySQL based on the propagation of SQL statements from master to slave is called _ ?MySQL Which of the following flip-flop is used as latch? After three clock cycles the output state P, Q is (respectively),GATE CSE 2000 The following arrangement of master-slave flip flops has the initial state of P, Q as 0, 1 (respectively). What is the major advantage of the J-K flip-flop over the S-R flip-flop? CBSE-english-2016Ĭan the automatic RC circuit be used to set a flip-flop rather than reset the flip-flop? explain. Write a short story with the help of outline below. What is the difference between level and edge triggering? Explain the working of master slave J - K flip flop? With the help of a neat diagram explain the working of a Master Slave JK flip flopĪ positive edge-triggered D flip-flop is connected to a positive edge-triggered JK flipflop as follows. With the help of block diagram explain the working of a JK Master Slave flip flop? It is, therefore, incumbent on the engineer to design circuits which comply with hold times specified in the data sheets for the devices being used.ģ) Master Slave flip flops require an entire clock pulse.Ĥ) A transparent latch is one in which Q follows D (or S&R) for as long as the enable is acitve.Explain how a master slave J K Flip Flop works? Master slave type flip flops aid in the prevention of this occurring but are by no means are a concrete solution. If these oscillating outputs are latched into the next stage of the circuit it is entirely possible that incorrect data will be accepted. They may take longer than normal to settle to their desired states or might even oscillate for a period of time before finally settling down to the proper states. If inputs change as the input signals are propagating through the flip flop circuitry, unstable outputs may result. It occurs when the inputs (D, JK, preset, etc) to a flip flop are not stable for a long enough period of time either before the triggering clock signal or after it or both. Metastability is a problem associated with all flip flops. The leading edge triggers the Master and the trailing edge triggers the Slave. It takes one entire clock pulse to propagate the inputs presented at J and K to Q and 'Q. Note that CLK, which goes directly into the Master FF, is inverted into the Slave FF. Here is an example of a JK Master Slave FF. Hence, an entire clock pulse is required to accept new inputs and propagate them to the outputs. The clock input to the slave is the complement to the clock of the master. The outputs of the master are then fed to the inputs of the slave. They are constructed from two similar flip flops connected together with the master accepting the inputs either on the rising edge of the clock pulse or while the clock is HI. This configuration of either D or JK flip flops is known as Master Slave flip flops. The solution to this dilemma can be found in a special configuration of D and JK flip flops which latch the inputs present at J & K on the leading edge of the clock pulse but are not passed through to the outputs (Q and 'Q) until the trailing edge of the clock. A timing problem would arise if the inputs are being latched into the flip flops at the same time that the outputs are changing. Note that the inputs (J & K) are derived from outputs of other flip-flops. To make a toggling flip flop simply tie both J & K to HI. JK flip flops are considered to be universal because D flip flops can be made from them by inverting J into K. Note that triangles on the outside of the chip rectangle indicate active LO inputs and outputs. A commonly used JK flip-flop is the 74LS76 shown below. It can be used to divide the clock frequency by a factor of two if so desired. When J & K are both active, the value of Q will be complemented upon receipt of the CLK pulse. The JK flip flop is unique in that it has two control inputs (J & K) but all possible inputs of J and K are possible.
0 kommentar(er)
