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Parity

Parity. Datasheets. TTL: http://www.techlearner.com/C&D/index.htm CMOS: http://fenix.student.utwente.nl/~fenix/datasheets_4000.html. Parity Generation and Checking. Parity: The number of 1’s in a bit stream. Application: Error detection and correction. Parity generator:

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Parity

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  1. Parity

  2. Datasheets • TTL: • http://www.techlearner.com/C&D/index.htm • CMOS: • http://fenix.student.utwente.nl/~fenix/datasheets_4000.html

  3. Parity Generation and Checking • Parity: • The number of 1’s in a bit stream. • Application: • Error detection and correction. • Parity generator: • the circuit that generates the parity bit before transmitting. • Parity checker: • the circuit that checks the parity in the receiver.

  4. Parity Generation - Example • P(X,Y,Z) must produce a 1 for all the input combinations that contain an odd number of 1s • Thus, it is a 3-input odd function P = XYZ

  5. Parity Checking - Example (cont.) • How would you implement a parity checker for the previous example? • Use a 4-input XOR circuit (another odd function) C = XYZP  1 indicates an error • OR • A 4-input XNOR circuit (even function) C = (XYZP)’  1 indicates a pass

  6. XOR

  7. Parity Circuits • Daisy Chain • Tree

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