Difference between revisions of "Parity"

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It consists of one extra [[bit]] per [[byte]]/[[word]]. On storage or transmission, the parity bit is set so that the total number of 'on' bits across the entire group is either even (so-called 'even parity') or odd ('odd parity'). When the data is read back or received, the parity is checked, to make sure that it is what is expected.
 
It consists of one extra [[bit]] per [[byte]]/[[word]]. On storage or transmission, the parity bit is set so that the total number of 'on' bits across the entire group is either even (so-called 'even parity') or odd ('odd parity'). When the data is read back or received, the parity is checked, to make sure that it is what is expected.
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==See also==
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* [[UNIBUS parity]]
  
 
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[[Category: Computer Basics]]
 
[[Category: Computer Basics]]

Latest revision as of 15:31, 6 December 2020

Parity is a very early error-detectiion system (now mostly replaced by CRCs). It can detect all one-bit errors, but only about half of all two-bit errors.

It consists of one extra bit per byte/word. On storage or transmission, the parity bit is set so that the total number of 'on' bits across the entire group is either even (so-called 'even parity') or odd ('odd parity'). When the data is read back or received, the parity is checked, to make sure that it is what is expected.

See also