Data strobe encoding: Difference between revisions

Revision as of 22:57, 27 June 2008

Revision as of 04:36, 18 September 2008

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It uses two signal lines (e.g. wires in a cable or traces on a [[printed circuit board]]), ''Data'' and ''Strobe''. These have the property that either Data or Strobe changes its logical value in one [[clock cycle]], but never both.

This allows for easy [[clock recovery]] with a good [[jitter]] tolerance by [[XOR]]ing the two signal line values.

There is an equivalent way to specify the relationship between Data and Strobe.

For even-numbered Data bits, Strobe is the opposite of Data.

For odd-numbered Data bits, Strobe is the same as Data.

From this definition it is more obvious that the XOR of Data and Strobe will yield a clock signal. Also, it specifies the simplest means of generating the Strobe signal for a given Data stream.

Data strobe encoding originated in [[IEEE 1355]] Standard and is used on the signal lines in [[SpaceWire]] and the [[FireWire|IEEE 1394]] (also known as [[FireWire 400]]) system.