Data strobe encoding

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image:Data_Strobe_Encoding.png
Data strobe encoding and recovered clock.

Data strobe encoding (or D/S encoding) is an encoding scheme for transmitting data in digital circuits. 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 XORing the two signal line values.

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

Gray code is another code that always changes one logical value, but never more than one.


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