lockstep processor techniqueA processor lockstep is a technique used to achieve high reliability in a microprocessor system. This is done by adding a second identical processor to a system that monitors and verifies the operation of the system processor.
* The two processors are initialized to the same state during system start-up, and they receive the same inputs (code, bus operations and asynchronous events), so during normal operation the state of the two processors is identical from clock to clock. They are said to be operating in lockstep. The lockstep technique assumes that an error in either processor will cause a difference between the states of the two processors, which will eventually be manifested as a difference in the outputs, so the lockstep system monitors the outputs of the two processors and flags an error in the case of a discrepancy. [* Adapted from IBM PowerPC Tips]
Stay up to date on the latest developments in Internet terminology with a free weekly newsletter from Webopedia. Join to subscribe now.
Webopedia's student apps roundup will help you to better organize your class schedule and stay on top of assignments and homework. Read More »List of Free Shorten URL Services
A URL shortener is a way to make a long Web address shorter. Try this list of free services. Read More »Top 10 Tech Terms of 2015
The most popular Webopedia definitions of 2015. Read More »
The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... Read More »Computer Architecture Study Guide
Webopedia's computer architecture study guide is an introduction to system design basics. It describes parts of a computer system and their... Read More »What Are Network Topologies?
Network Topology refers to layout of a network. How different nodes in a network are connected to each other and how they communicate is... Read More »