Cross-talk processing in serial link buses

• US 8,093,910 B2
• Filed: 03/04/2009
• Issued: 01/10/2012
• Est. Priority Date: 03/04/2009
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Schmatz, Martin Leo, Toifl, Thomas H.
• Primary Examiner(s): NGUYEN, HOAI AN D
• Application Number:
  US12/397,815
• Publication Number:
  US 20100226241A1
• Time in Patent Office: 1,042 Days
• Field of Search: 324/628, 324/627, 324/612, 324/600, 324/555, 324/76.11, 702/1, 702/57, 702/85, 702/108, 702/127, 340/538.12, 340/12.34
• US Class Current: 324/628
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating

Abstract

A system and method for cross talk compensation in serial link busses, the method including: evaluating if a positive potential or a negative potential is being received by a receiver of a victim from an aggressor is dominant; measuring the distance between an incident signal and a decision threshold to obtain a positive or negative value; and using the positive or negative sign as a recovered bit value if positive potential or a negative potential is being received by a receiver of a victim from an aggressor is not dominant and using the sign of the positive potential or a negative potential that is being received by a receiver of a victim from an aggressor if this is dominant.

Claims

1. A method for cross talk compensation in serial link busses comprising:

evaluating if a positive potential or a negative potential is being received by a receiver of a victim from an aggressor is dominant;

measuring the difference between the received signal and a signal having a predetermined value to obtain a positive or negative signal; and

using the positive or negative signal as a recovered bit value.

2. The method of claim 1 further comprising:

using the positive or negative signal of the difference measurement when the difference measurement between the received signal and the predetermined signal is greater than a predetermined value.

3. The method of claim 1 further comprising:

using the positive or negative value of the signal when the difference between the received signal and the predetermined signal is less than a predetermined value.

4. The method of claim 1 where the serial link buses comprises:

differential or single ended links.

5. The method of claim 3 further comprises:

determining the difference between the received signal and the predetermined signal by generating a current or a voltage which represents a cross talk coefficient for each aggressive bit received by the victim.

6. The method of claim 5 further comprising:

estimating or approximating the value of the difference of the current or the voltage of the received signal and the predetermined signal.

7. The method of claim 6 further comprising:

estimating or approximating the value of the difference of the current or the voltage of the received signal and the predetermined signal by adding a constant current or voltage which is proportional to the value of the cross talk coefficient voltage.

8. The method of claim 5 further comprises:

determining the sign of the received signal with a comparator or an ADC.

9. The method of claim 5, further comprising:

determining the sign of the predetermined signal with a comparator or an ADC.

10. A system for cross talk compensation in serial link busses comprising:

evaluating means for determining if a positive potential or a negative potential is being received by a receiver of a victim from an aggressor is dominant;

measuring means for determining the difference between the received signal and a signal having a predetermined value to obtain a positive or negative signal; and

adding means for using the positive or negative signal as a recovered bit value.

11. The system of claim 10 wherein:

the adding means uses the positive or negative signal of the difference measurement when the difference measurement between the received signal and the predetermined signal is greater than a predetermined value.

12. The system of claim 10 wherein:

the adding means uses the positive or negative value of the signal when the difference between the received signal and the predetermined signal is less than a predetermined value.

13. The system of claim 10 wherein the serial link buses comprises:

differential or single ended links.

14. The system of claim 12 further comprising:

evaluating means for determining the difference between the received signal and the predetermined signal by generating a current or a voltage which represents a cross talk coefficient for each aggressive bit received by the victim.

15. The system of claim 14 further comprising:

estimating or approximating means for selecting the value of the difference of the current or the voltage of the received signal and the predetermined signal.

16. The system of claim 15 wherein:

the estimating or approximating means selects the value of the difference of the current or the voltage of the received signal and the predetermined signal by adding a constant current or voltage which is proportional to the value of the cross talk coefficient voltage.

17. The system of claim 14 further comprises:

selecting means for determining the sign of the received signal and the predetermined signal with a comparator or an ADC.

18. The system of claim 14 further comprises:

selecting means for determining the sign of the predetermined signal with a comparator or an ADC.

19. A computer program product for cross talk compensation in serial link busses, said computer program product comprising:

a computer readable medium executable by a processing device, said medium having;

first program instructions for evaluating if a positive potential or a negative potential is being received by a receiver of a victim from an aggressor is dominant;

second program instructions for measuring the difference between the received signal and a signal having a predetermined value to obtain a positive or negative signal; and

third program instructions for using the positive or negative signal as a recovered bit value.

20. The computer program product of claim 19 further comprising:

fourth program instructions for using the positive or negative signal of the difference measurement when the difference measurement between the received signal and the predetermined signal is greater than a predetermined value.