What is race condition in latches?
What is race condition in latches?
A Race condition is when a device’s output depends on two [or more] nearly simultaneous events to occur, and where which signal arrives first will change the output of the circuit. A race condition can be a logic hazard, or can result in a random value being held in a latch.
What is race around condition in which flip flop it is overcome?
For J-K flip-flop, if J=K=1, and if clk=1 for a long period of time, then output Q will toggle as long as CLK remains high which makes the output unstable or uncertain. This is called a race around condition in J-K flip-flop. We can overcome this problem by making the clock =1 for very less duration.
What is race condition in sequential circuit?
A race condition exists in an asynchronous sequential circuit when two or more binary state variables change in response to a change in an input variable. – When unequal delays are encountered, a race condition may cause the state variables to change in an unpredictable manner.
Which is the prohibited condition in SR latch?
Explanation: In a NAND based S-R latch, If S’=0 & R’=0 then both the outputs (i.e. Q & Q’) goes HIGH and this condition is called an ambiguous/forbidden state. This state is also known as an Invalid state as the system goes into an unexpected situation.
Why does race condition occur in SR latch?
When the S and R inputs of an SR flipflop is at logical 1, then the output becomes unstable and it is known as race condition. When the S and R inputs of an SR flipflop is at logical 1 and then the input is changed to any other condition, then the output becomes unpredictable and this is called the race condition.
What is the main difference between latch and flip flop?
The difference between a latch and a flip-flop is that a latch is level-triggered (outputs can change as soon as the inputs changes) and Flip-Flop is edge-triggered (only changes state when a control signal goes from high to low or low to high).
What is the main difference between latch and flip-flop?
How can race conditions be prevented?
Race conditions can be avoided by proper thread synchronization in critical sections. Thread synchronization can be achieved using a synchronized block of Java code. Thread synchronization can also be achieved using other synchronization constructs like locks or atomic variables like java.
What is disadvantage of SR flip-flop?
When the S and R inputs of an SR flipflop are at logical 1, then the output becomes unstable and it is known as a race condition. So, the main disadvantage of the SR flip flop is invalid output when both inputs are high.
Which is faster latch or flip-flop?
Latches are faster, flip flops are slower. Latch is sensitive to glitches on enable pin, whereas flip-flop is immune to glitches. Latches take less gates (less power) to implement than flip-flops. But flip flop is always clocked.
Is there a race condition in the RS flip flop?
No Race Condition in RS flip-flop. Race around condition exist in JK flip flop. In JK flip flop when both inputs are 1 the output continuously toggles between 1 and 0; this continuous toggling with instability is called race around condition in JK flip flop.
How is a SR latch represented in a state diagram?
In this state diagram, a state is represented by a circle, and the transition between states is represented by lines or arcs that connect the circles. State diagram for a simple SR latch is shown below. The state diagram provides all the information that a state table can have. This is obtained from the state table directly.
When is the output of an SR flipflop unstable?
When the S and R inputs of an SR flipflop is at logical 1, then the output becomes unstable and it is known as race condition. When the S and R inputs of an SR flipflop is at logical 1 and then the input is changed to any other condition, then the output becomes unpredictable and this is called the race condition. Which one is right?
What are the disadvantages of a latch circuit?
Disadvantages of latches Latch less predictable because there is more chance to affect to race conditions. Level sensitive devices and hence more chance of metastability. Analysing of Latch circuits is difficult because of its level sensitive property.