Differential pair group equalization system

Patent metadata

Field	Value
Publication number	US-10660197-B2
Application number	US-201816041315-A
Country	US
Kind code	B2
Filing date	Jul 20, 2018
Priority date	Jul 20, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A differential pair group equalization system includes a board providing a differential trace pair group with a plurality of differential trace pairs, each of a transmitter device and a receiver device are coupled to the board and the differential trace pairs in the differential trace pair group. At least one of the transmitter device and the receiver device operates to identify a first differential trace pair in the differential trace pair group, and adjust second differential trace pair equalization parameters for a second differential trace pair in the differential trace pair group. If it is determined that first differential trace pair signal transmission capabilities for the first differential trace pair have improved in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair the second differential trace pair equalization parameters are set for the second differential trace pair.

First claim

What is claimed is:

1. A differential pair group equalization system, comprising:
a board;
a differential trace pair group that is provided on the board, wherein the differential trace pair group includes a plurality of differential trace pairs;
a transmitter device that is coupled to the board and to each of the plurality of differential trace pairs in the differential trace pair group; and
a receiver device that is coupled to the board and to each of the plurality of differential trace pairs in the differential trace pair group, wherein at least one of the transmitter device and the receiver device is configured to:
identify a first differential trace pair that is included in the plurality of differential trace pairs in the differential trace pair group;
adjust second differential trace pair equalization parameters for a second differential trace pair that is included in the plurality of differential trace pairs in the differential trace pair group; and
determine that first differential trace pair signal transmission capabilities for the first differential trace pair have improved in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair and, in response, set the second differential trace pair equalization parameters for the second differential trace pair.

2. The system of claim 1 , wherein the at least one of the transmitter device and the receiver device is configured to:
adjust third differential trace pair equalization parameters for at least one third differential trace pair that is included in the plurality of differential trace pairs in the differential trace pair group; and
determine that the first differential trace pair signal transmission capabilities for the first differential trace pair have improved in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair and the third differential trace pair equalization parameters for the at least one third differential trace pair and, in response, set the third differential trace pair equalization parameters for the at least one third differential trace pair.

3. The system of claim 1 , wherein the at least one of the transmitter device and the receiver device is configured to:
perform training operations on the plurality of differential trace pairs in the differential trace pair group, wherein the training operations provide for the identification of differential trace pair signal transmission capabilities for each of the plurality of differential trace pairs in the differential trace pair group; and
identify the first differential trace pair based on the first differential trace pair signal transmission capabilities for the first differential trace pair being lower than the differential trace pair signal transmission capabilities of each of the other differential trace pairs in the differential trace pair group.

4. The system of claim 3 , wherein the determining that the first differential trace pair signal transmission capabilities for the first differential trace pair have improved include determining that the first differential trace pair signal transmission capabilities for the first differential trace pair have increased in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair.

5. The system of claim 1 , wherein the adjusting the second differential trace pair equalization parameters for the second differential trace pair includes at least one of:
providing for the de-emphasis of signals transmitted by the second differential trace pair; and
providing for the emphasis of signals transmitted by the second differential trace pair.

6. The system of claim 1 , wherein the determining that first differential trace pair signal transmission capabilities for the first differential trace pair have improved include:
determining that an eye opening in an eye opening diagram for the differential trace pair group has increased in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair and, in response, set the second differential trace pair equalization parameters for the second differential trace pair.

7. An Information Handling System (IHS), comprising:
a processing system; and
a memory system that is coupled to the processing system and that includes instructions that, when executed by the processing system, cause the processing system to provide an equalization engine that is configured to:
identify a first differential pair that is included in a plurality of differential pairs that are coupled to the processing system;
provide for the adjustment of second differential pair equalization parameters for a second differential pair that is included in the plurality of differential pairs that are coupled to the processing system; and
determine that first differential pair signal transmission capabilities for the first differential pair have improved in response to the adjustment of the second differential pair equalization parameters for the second differential pair and, in response, cause the second differential pair equalization parameters to be set for the second differential pair.

8. The IHS of claim 7 , wherein the equalization engine is configured to:
provide for the adjustment of third differential pair equalization parameters for at least one third differential pair that is included in the plurality of differential pairs that are coupled to the processing system; and
determine that the first differential trace pair signal transmission capabilities for the first differential pair have improved in response to the adjustment of the second differential pair equalization parameters for the second differential pair and the third differential pair equalization parameters for the at least one third differential pair and, in response, cause the third differential pair equalization parameters to be set for the at least one third differential pair.

9. The IHS of claim 7 , wherein the equalization engine is configured to:
perform training operations on the plurality of differential pairs that are coupled to the processing system, wherein the training operations provide for the identification of differential pair signal transmission capabilities for each of the plurality of differential pairs that are coupled to the processing system; and
identify the first differential pair based on the first differential pair signal transmission capabilities for the first differential pair being lower than the differential pair signal transmission capabilities of each of the other differential pairs that are coupled to the processing system.

10. The IHS of claim 9 , wherein the determining that the first differential pair signal transmission capabilities for the first differential pair have improved include determining that the first differential pair signal transmission capabilities for the first differential pair have increased in response to the adjustment of the second differential pair equalization parameters for the second differential pair.

11. The IHS of claim 7 , wherein the adjusting the second differential pair equalization parameters for the second differential pair includes at least one of:
providing for the de-emphasis of signals transmitted by the second differential pair; and
providing for the emphasis of signals transmitted by the second differential pair.

12. The IHS of claim 7 , wherein the determining that first differential pair signal transmission capabilities for the first differential pair have improved include:
d

Assignees

• Dell Products Lp

Inventors

• Butcher Wade Andrew
• Mutnury Bhyrav M

Classifications

• H04B3/14 Primary

  characterised by the equalising network used · CPC title

• H04B3/148

  variable equalisers · CPC title

• H04B1/40

  Circuits · CPC title

• H05K1/0228

  Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors (balanced signal pairs H05K1/0245) · CPC title

• H05K2201/09236

  Parallel layout · CPC title