Hazard
在数字逻辑,,,,a冒险in a system is an undesirable effect caused by either a deficiency in the system or external influences. Logic hazards are manifestations of a problem in which changes in the input variables do not change the output correctly because of some form of delay caused by logic elements (AND,,,,NOT,,,,或大门,,,,etc.) This results in the logic not doing its function properly. The 3 different most common hazards are usually referred to the动态,静态,,,,andfunction hazards。
危险是暂时的问题,因为逻辑电路将逐渐沉降到所需的功能。但是,尽管逻辑达到了正确的输出,但必须消除危害,因为它们可以对其他连接的系统产生影响。
Astatic hazard是当1个输入变量发生变化时,输出在稳定之前瞬间变化以纠正值时,该情况会发生变化。有两种类型的静态危害:
- Static-1 Hazard: the output is currently one and after the inputs change, the output momentarily changes to zero before settling on one.
- Static-0 Hazard: the output is 0 and after the inputs change, the output momentarily changes 1 before settling on 0
Adynamic hazardis possibility of an output changing more than once which is a result of a single input change. Dynamic hazards occur often in larger logic circuits where there are present different routes to the output. If each route has a different delay, then it rapidly becomes clear that there is potential for changing the output values which differ from the expected output. For example A logic circuit is meant to change output state
from1to0,而是从1to0,,,,然后1and then rests at the correct value0。This is called as dynamic hazard.
无危险电路的示例由
普通k?地图答案由
Y=x1x2+x2'x3
无危险图由
Y=x1x2+x2'x3+x1x3
Hazard Free Logic diagram is given by
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