Combining a clock signal and a data signal

US 20020181608A1
Filed: 03/15/2002
Published: 12/05/2002
Est. Priority Date: 03/16/2001
Status: Active Grant

First Claim

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1. A method of transmitting data in a system including at least one data channel and a separate clock channel, the clock channel being used to decode data transmitted on the at least one data channel, comprising:

combining a clock signal to be transmitted on the clock channel with a data signal having a plurality of data words to generate a combined clock and data signal, and transmitting the combined clock and data signal on the clock channel;

wherein the data signal has been generated from the data words using an encoding scheme that shifts an energy spectrum of the combined clock and data signal away from an effective loop bandwidth of a clock recovery block.

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Abstract

A method of transmitting data in a system including at least one data channel and a separate clock channel is disclosed. The method involves combining a clock signal to be transmitted on the clock channel with a data signal to generate a combined clock and data signal. In one embodiment, the data signal has been generated from data words using an encoding scheme that shifts an energy spectrum of the data signal away from an energy spectrum of the clock signal. In another embodiment, the clock signal has a plurality of pulses each having a front edge and a back edge, and the data signal is modulated onto the clock signal by moving at least one edge (i.e. front or back or both) of the plurality of pulses, thereby to create a combined clock and data signal.

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33 Claims

1. A method of transmitting data in a system including at least one data channel and a separate clock channel, the clock channel being used to decode data transmitted on the at least one data channel, comprising:
- combining a clock signal to be transmitted on the clock channel with a data signal having a plurality of data words to generate a combined clock and data signal, and transmitting the combined clock and data signal on the clock channel;
  
  wherein the data signal has been generated from the data words using an encoding scheme that shifts an energy spectrum of the combined clock and data signal away from an effective loop bandwidth of a clock recovery block.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 29, 30, 31, 32, 33)
- - 2. The method of claim 1 wherein the encoding scheme maps the data word from a p-bit data word into a q-bit data word, where q>
    - p.
  - 3. The method of claim 2 wherein said encoding scheme is direct current (DC) balanced to minimize a DC component of the combined signal.
  - 4. The method of claim 1 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge, and wherein the combining step comprises:
    - modulating the data signal onto the clock signal by moving the front or back edges of the plurality of pulses.
  - 5. The method of claim 1 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge, and wherein the combining step comprises:
    - modulating the data signal onto the clock signal by moving the front edges of the plurality of pulses.
  - 6. The method of claim 1 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a first edge and a second edge, and wherein the combining step comprises:
    - modulating the data signal onto the clock signal by moving both the front edges and the back edges of the plurality of pulses.
  - 7. The method of claim 1 wherein said combining further comprises:
    - performing pre-emphasis to the combined signal, so that inter-symbol interference of the combined signal transmitted over a band-limited channel is minimized or reduced.
  - 8. The method of claim 2 wherein said encoding scheme further comprises:
    - increasing a number of transitions in each data word.
  - 9. The method of claim 1 wherein the encoding scheme is a an encryption scheme
  - 10. The method of claim 1 wherein the encoding scheme includes the step of:
    - encoding an instantaneous data word of said plurality of data words as function of both the instantaneous input word and earlier data words in the data signal.
  - 11. The method of claim 1 wherein the encoding scheme includes the step of:
    - encoding one of the data words of said plurality of data words as a function of one of the following;
      
      future data words;
      
      or earlier data words;
      
      or future and earlier data words;
      
      of said plurality of data words.
  - 13. The method of claim 12 further comprising:
    - encoding the data words using an encoding scheme that maps the data words from p-bit data words into a q-bit data words, where q>
      
      p.
  - 14. The method of claim 13 wherein the encoding scheme is direct current (DC) balanced to minimize a DC component of the combined signal.
  - 15. The method of claim 12 wherein the modulating step comprises:
    - modulating the data signal onto the clock signal by moving both of the front and back edges of the plurality of pulses.
  - 16. The method of claim 12 wherein the modulating step comprises:
    - modulating the data signal onto the clock signal by moving the front edges of the plurality of pulses.
  - 17. The method of claim 12 wherein the modulating step comprises:
    - modulating the data signal onto the clock signal by moving the back edges of the plurality of pulses.
  - 18. The method of claim 12 further comprising:
    - performing pre-emphasis to the combined signal, so that inter-symbol interference of the combined signal transmitted over a band-limited channel is minimized or reduced.
  - 19. The method of claim 12 further comprising:
    - encoding the data words using an encoding scheme that increasing a number of transitions in each data word.
  - 20. The method of claim 19 wherein the encoding scheme is a an encryption scheme
  - 21. The method of claim 12 further comprising:
    - encoding an instantaneous data word of said plurality of data words as function of both the instantaneous input word and earlier data words in the data signal.
  - 22. The method of claim 12 further comprising:
    - encoding one of the data words of said plurality of data words as a function of one of the following;
      
      future data words;
      
      or earlier data words;
      
      or future and earlier data words;
      
      of said plurality of data words.
  - 24. The system of claim 23 wherein the encoding scheme maps the data word from a p-bit data word into a q-bit data word, where q>
    - p.
  - 25. The system of claim 23 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge, and wherein the transmitter combines the clock signal with the data signal by:
    - modulating the data signal onto the clock signal by moving at least one edge of the plurality of pulses.
  - 26. The system of claim 23 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge, and wherein the transmitter combines the clock signal with the data signal by:
    - modulating the data signal onto the clock signal by moving the front edges of the plurality of pulses.
  - 27. The system of claim 23 wherein the clock signal has a plurality of pulses, each pulse of the plurality of pulses having a first edge and a second edge, and wherein the transmitter combines the clock signal with the data signal by:
    - modulating the data signal onto the clock signal by moving both the front edges and the back edges of the plurality of pulses.
  - 29. The system of claim 28 wherein the transmitter is further operative to:
    - encode the data words using an encoding scheme that maps the data words from p-bit data words into a q-bit data words, where q>
      
      p.
  - 30. The system of claim 28 wherein the transmitter is further operative to:
    - modulate the data signal onto the clock signal by moving both of the front and back edges of the plurality of pulses.
  - 31. The system of claim 28 wherein the transmitter is further operative to:
    - modulate the data signal onto the clock signal by moving the front edges of the plurality of pulses.
  - 32. The system of claim 28 wherein the transmitter is further operative to:
    - modulating the data signal onto the clock signal by moving the back edges of the plurality of pulses.
  - 33. The system of claim 28 wherein the transmitter uses an encoding scheme for generating the data signal from the data words that shifts an energy spectrum of the combined clock and data signal away from an effective loop bandwidth of a clock recovery block.

12. A method of transmitting data in a system including at least one data channel and a separate clock channel, the clock channel being used to decode data transmitted on the at least one data channel, comprising:
- providing a clock signal having a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge;
  
  modulating a data signal having a plurality of data words onto the clock signal by moving at least one edge of the plurality of pulses, thereby to create a combined clock and data signal; and
  
  transmitting the combined clock and data signal on the clock channel.

23. A system for transmitting data, comprising a transmitter including at least one data channel and a separate clock channel, the clock channel being used by a receiver to decode data transmitted on the at least one data channel, the transmitter being operative to:
- combine a clock signal to be transmitted on the clock channel with a data signal having a plurality of data words, to generate a combined clock and data signal, and transmit the combined clock and data signal on the clock channel;
  
  wherein the data signal has been generated from the data words using an encoding scheme that shifts an energy spectrum of the combined clock and data signal away from an effective loop bandwidth of a clock recovery block.

28. A system for transmitting data, comprising a transmitter including at least one data channel and a separate clock channel, the clock channel being used by a receiver to decode data transmitted on the at least one data channel, the transmitter being operative to:
- provide a clock signal having a plurality of pulses, each pulse of the plurality of pulses having a front edge and a back edge;
  
  modulate a data signal having a plurality of data words onto the clock signal by moving at least one edge of the plurality of pulses, thereby to create a combined clock and data signal; and
  
  transmit the combined clock and data signal on the clock channel.

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Current Assignee
Silicon Image, Inc. (Lattice Semiconductor Corporation)
Original Assignee
Silicon Image, Inc. (Lattice Semiconductor Corporation)
Inventors
Kim, Min-Kyu, Hwang, Seung Ho, Kim, Gyudong, Kim, Bruce, Kim, Ook

Granted Patent

US 7,158,593 B2
Time in Patent Office

Days
Field of Search
US Class Current

375/295
CPC Class Codes

G09G 5/006   Details of the interface to...

H04L 25/4902   Pulse width modulation; Pul...

H04L 5/06   the signals being represent...

H04L 7/0008   Synchronisation information...

H04L 7/0054   Detection of the synchronis...

H04L 7/027   extracting the synchronisin...

Combining a clock signal and a data signal

First Claim

8 Assignments

0 Petitions

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Abstract

29 Citations

33 Claims

Specification

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Combining a clock signal and a data signal

First Claim

8 Assignments

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0 Petitions

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Accused Products

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Abstract

29 Citations

33 Claims

Specification

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Solutions

Use Cases

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