Difference between Static-1 and Static-0 hazardIn this article, we will discuss the differences between Static-1 and Static-0 hazards. A hazard in a digital circuit causes a temporary fluctuation in the circuit output. In other words, a hazard in a digital circuit is a temporary disturbance in the ideal circuit operation. If we provide it some time, it will resolve itself. These disturbances or fluctuations occur when different paths from the input to output have different delays. Due to this, modifications to the input variables do not immediately affect the output but appear at the output after a small delay caused by the circuit building elements, i.e., logic gates. What are Static hazard?Static hazards (also referred to as static logic or static competition hazards) are one of the logic hazard types that can be encountered in the circuits of digital logic. This type of problem occurs because of the finite delay in signals that pass through gates, which later on form glitches, malfunctions, or spikes before they reach the stable signal. The main difference between Static-1 and Static-0 hazards is the setting that causes the condition resemblance and the behavior of the circuit. Static-1 Hazard:Static-1 hazard is the name given to the case when the output glitches briefly back to a 1 value prior to settling at its final correct 0 value, resulting from a transition from 1 to 0 in the input of either a logic gate or a combination of gates. It happens when each of the paths through the logic gates is not well-matched for the propagation delays. For instance, we take an AND gate composed of two inputs, A and B. If input A changes from 1 to 0 while input B is still 1, the output of the AND gate should positively respond and change from 1 to 0 in an instant. Consequently, the displacements at the boundaries may shortly go back to 1 before eventually stabilizing at 0. The conditions for a Static-1 hazard to occur are:
Static-0 Hazard:Another hazard is a Static-0 hazard, which refers to the state of an input of a logic gate or a group of gates after a transition from 0 to 1, in which the output temporarily acts like it is a 0 before eventually settling to the correct 1 value. It occurs when the propagation delay of some input nodes is smaller than the larger propagation of the other input nodes. As a result, the output goes to 0 for a brief moment before reaching the 1 state. For instance, the change of an input from 0 to 1 in an OR gate (A, B), having two inputs, should lead to the immediate change of the output from 1 to 0. Nevertheless, because there are varying latencies, the output could first go back to 0 and then make the final jump to 1. The conditions for a Static-0 hazard to occur are:
Key differences between Static-1 and Static-0 Hazards:There are several differences between the static-1 and static-0 hazards. Some main differences between these hazards are as follows:
Conclusion:In conclusion, Static-1 and Static-0 hazards are non-recurring events in digital circuits that occur due to incorrect timings during signal transmission. Static-1 hazards usually deal with brief glitches caused by the output line being temporarily back to 1 before switching to 0 during the transition of 1 to 0 in the input. On the other hand, the Static-0 hazards are the condition where the output acts like a 0 transiently before it settles in 1, due to changeover from 0 to 1. They implement delay elements and input buffering to reduce or even eliminate risks to ensure the proper operation of a circuit. The mechanisms of hazard removal are often the key to the safe and sound of digital systems. Next TopicDifference Between |
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