Transmitter circuit comprising timing deskewing means

• US 6,480,021 B2
• Filed: 11/06/2001
• Issued: 11/12/2002
• Est. Priority Date: 10/31/2000
• Status: Expired due to Term

• Current Assignee: Computer Circuit Operations LLC
• Original Assignee: Acuid Corp. Ltd.
• Inventors: Deas, Alexander Roger, Abrosimov, Igor Anatolievich, Atyunin, Vasily Grigorievich
• Primary Examiner(s): Tokar, Michael
• Assistant Examiner(s): TRAN, ANH Q
• Application Number:
  US09/985,726
• Publication Number:
  US 20020051506A1
• Time in Patent Office: 371 Days
• Field of Search: 326/30, 326/82, 326/83, 326/86, 326/90
• US Class Current: 326/30
• CPC Class Codes: G01R 31/31725 Timing aspects, e.g. clock distribution, skew, propagation delay for tester hardware G01R31/31937
• CPC Class Codes: G06F 1/10 Distribution of clock signals , e.g. skew
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04L 25/028 Arrangements specific to the transmitter end
• CPC Class Codes: H04L 25/0292 Arrangements specific to the receiver end

Abstract

The present invention relates generally to the transmission of digital data. More particularly, the invention relates to a high-speed data transmission between integral circuits (ICs) or chips.

A data transmission means for high-speed transmission of digital data is proposed, the data transmission means comprising:

at least one driver for driving a transmission line; and

a timing deskewing means connected thereto, wherein

the timing deskewing means comprises

a storage means for recording and storing information on skew caused by inter-symbol interference and cross-talk influence in the transmission line, for at least one data pattern transmitted through the transmission line; and

an adjustment means for generating and applying a correction to the timing position of a signal transition between two logical levels, the correction being generated on the basis of the information stored in the storage means, so as to compensate for the above skew.

The present invention allows to reduce the skew of signals at the end of a transmission line so as to compensate for the effects of cross-talk and various signal reflections, settling time influence, or other kind of inter-symbol interference like frequency dependent line resistance due to skin effect and provide thereby a high performance transmission means for high speed transmission of digital data.

Claims

1. A data transmission means for high-speed transmission of digital data, the data transmission means comprising:

at least one driver for driving a transmission line and

a timing deskewing means connected thereto, wherein

the timing deskewing means comprises

a storage means for recording and storing information on skew caused by inter-symbol interference and cross-talk influence in the transmission line, for at least one data pattern transmitted through the transmission line; and

an adjustment means for generating and applying a correction to the timing position of a signal transition between two logical levels, the correction being generated on the basis of the information stored in the storage means, so as to compensate for the above skew.

2. The transmission means according to claim 1, wherein the storage means is adapted to record and store information on the skew caused by signal reflections in the transmission line.

3. The transmission means according to claim 1, wherein the storage means is adapted to record and store information on the skew caused by settling time effect in the transmission line.

4. The transmission means according to claim 1, comprising at least two transmission lines, wherein the storage means are further adapted to record and store information on the skew caused by signal crosstalk in said transmission lines, for at least one signal pattern transmitted through an adjacent transmission line.

5. The transmission means according to claim 1, wherein a shift register is used to address the storage means.

6. The transmission means according to claim 1, wherein a parallel register is used to address the storage means.

7. The transmission means according to claim 1, wherein the driver is a driver with variable drive current.

8. The transmission means according to claim 1, wherein a plurality of drivers is adjusted.

9. The transmission means according to claim 1, wherein the adjustment means comprises a variable delay incorporated into the data signal line.

10. The transmission means according to claim 1, wherein the adjustment means comprises a variable delay incorporated into the clock line which clocks output data.

11. A method of eliminating skew caused by inter-symbol interference and cross-talk influence in the transmission line for high-speed transmission of digital data, the method comprising:

transmitting of digital data through the transmission line provided by at least one driver;

measuring a skew for at least one data pattern transmitted through the transmission line; and

recording and storing information on skew caused by inter-symbol interference and cross-talk influence in the transmission line, for at least one data pattern transmitted through the transmission line; and

generating and applying a correction to the timing position of a signal transition between two logical levels, the correction being generated on the basis of the information stored in the storage means, so as to compensate for the above skew.

12. The method according to claim 11, wherein the information is recorded and stored on skew caused by signal reflections in the transmission line.

13. The method according to claim 11, wherein the information is recorded and stored on skew caused by settling time effect in the transmission line.

14. The method according to claim 11, wherein the information is recorded and stored on skew caused by signal crosstalk in said transmission line, of at least one signal pattern transmitted through an adjacent transmission line.

15. The method according to claim 11, wherein the correction is applied to the data signal line.

16. The method according to claim 11, wherein the correction is applied to the clock line, which clocks output data.

17. A transmission system for high-speed transmission of digital data, the transmission system including at least one transmission line electrically connecting a transmission means and a receiving means, wherein the transmission means comprises at least one driver for driving a transmission line and a timing deskewing means connected thereto, the timing deskewing means comprising:

a storage means for recording and storing information on skew caused by inter-symbol interference and cross-talk influence in the transmission line, for at least one data pattern transmitted through the transmission line; and

an adjustment means for generating and applying a correction to the timing position of a signal transition between two logical levels, the correction being generated on the basis of the information stored in the storage means, so as to compensate for the above skew.

18. The transmission means according to claim 17, wherein the storage. means is adapted to record and store information on the skew caused by signal reflections in the transmission line.

19. The transmission means according to claim 17, wherein the storage means is adapted to record and store information on the skew caused by settling time effect in the transmission line.

20. The transmission means according to claim 17, comprising at least two transmission lines, wherein the storage means are further adapted to record and store information on the skew caused by signal crosstalk in said transmission lines, for at least one signal pattern transmitted through an adjacent transmission line.