Race - Revision history

Jnc: Clarify

2020-03-05T19:03:30Z

Clarify

2020-02-12T14:02:20Z

An OK start

2020-02-06T05:08:08Z

+target section

2017-04-23T17:25:37Z

Redir to meta-stability

New page

#Redirect [[Meta-stability]]

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 Hardware races can occur when two [[synchronous]] [[signal]]s which interact flow through different numbers of [[gate]]s before their interaction; this can mean that changes in their values are not quite synchronized, and as a result can create [[glitch]]es in the circuit's output. Such races can be handled with [[Karnaugh map]]s, though.
-Of more concern are the interaction of two [[asynchronous]] signals in a [[circuit]] with feedback, such as when they are inputs to a [[flip-flop]]. If they both change at the 'right' (sic) time, it can drive the circuit into a [[meta-stability|meta-stable]] state. Extensive theoretical work has shown that there is no 'solution' to this problem; designers can only minimize the problem.
+Of more concern are the interaction of two mutually [[asynchronous]] signals in a [[circuit]] with feedback, such as when they are inputs to a [[flip-flop]]. If they both change at the 'right' (sic) time, it can drive the circuit into a [[meta-stability|meta-stable]] state. Extensive theoretical work has shown that there is no 'solution' to this problem; designers can only minimize the problem.
 ==See also==

← Older revision		Revision as of 14:02, 12 February 2020
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−	~~#Redirect~~ [[~~Meta~~-stability~~#Latches~~ and ~~arbiters~~]]	+	A '''race''' condition occurs when two events are very close in time, and their interaction can cause problems. Races can occur in both [[hardware]] and [[software]].
		+
		+	Hardware races can occur when two [[synchronous]] [[signal]]s which interact flow through different numbers of [[gate]]s before their interaction; this can mean that changes in their values are not quite synchronized, and as a result can create [[glitch]]es in the circuit's output. Such races can be handled with [[Karnaugh map]]s, though.
		+
		+	Of more concern are the interaction of two [[asynchronous]] signals in a [[circuit]] with feedback, such as when they are inputs to a [[flip-flop]]. If they both change at the 'right' (sic) time, it can drive the circuit into a [[meta-stability\|meta-stable]] state. Extensive theoretical work has shown that there is no 'solution' to this problem; designers can only minimize the problem.
		+
		+	==See also==
		+
		+	* [[Bus Arbitration on the Unibus and QBUS]] - A classic example of the latter kind of hardware race
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		+	[[Category: Theory]]

← Older revision		Revision as of 05:08, 6 February 2020
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−	#Redirect [[Meta-stability]]	+	#Redirect [[Meta-stability#Latches and arbiters]]