Dynamic interface management for interference mitigation

Patent metadata

Field	Value
Publication number	US-2016364359-A1
Application number	US-201514736434-A
Country	US
Kind code	A1
Filing date	Jun 11, 2015
Priority date	Jun 11, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

Dynamic interface management for interference mitigation is disclosed. In one aspect, an integrated circuit (IC) is provided that employs a control system configured to mitigate electromagnetic interference (EMI) caused by an aggressor communications bus. The control system is configured to receive information related to EMI conditions and adjust a data/clock mode of an interface corresponding to the aggressor communications bus. In this manner, the interface is configured to couple to the aggressor communications bus. The interface is configured to transmit signals to and receive signals from the aggressor communications bus. The control system is configured to use the information related to the EMI conditions to set the data/clock mode of the interface to mitigate the EMI experienced by a victim receiver. Thus, the control system provides designers with an additional tool that may reduce performance degradation of the victim receiver attributable to EMI.

First claim

What is claimed is:

1 . An application processor, comprising:
an interface configured to:
couple to an aggressor communications bus;
transmit one or more application processor signals to the aggressor communications bus; and
receive one or more transceiver signals from the aggressor communications bus; and
a control system configured to:
receive information from a coexistence manager, the information related to electromagnetic interference (EMI) at a victim receiver as a result of the aggressor communications bus;
process a determination of a data/clock mode of the interface that mitigates a performance impact corresponding to the EMI; and
set the data/clock mode of the interface to mitigate the EMI.

2 . The application processor of claim 1 , wherein the control system is configured to process the determination of the data/clock mode by being configured to determine the data/clock mode to which to set the interface to mitigate the EMI experienced by the victim receiver.

3 . The application processor of claim 1 , wherein the coexistence manager is configured to:
receive information indicating if the victim receiver experiences EMI as a result of the aggressor communications bus; determine an acceptable performance level of the victim receiver; and determine the data/clock mode to which to set the interface to mitigate the EMI experienced by the victim receiver and allow the victim receiver to operate at or above the acceptable performance level.

4 . The application processor of claim 1 , wherein the information received from the coexistence manager comprises:
information indicating if the victim receiver experiences EMI as a result of the aggressor communications bus; and an acceptable performance level of the victim receiver.

5 . The application processor of claim 1 , wherein the control system is configured to set the data/clock mode by being configured to set a data rate of one or more lanes associated with the interface to mitigate the EMI.

6 . The application processor of claim 5 , wherein the control system is configured to set the data rate of the interface by being configured to multiplex a plurality of application processor signals associated with a plurality of the one or more lanes associated with the interface onto one lane associated with the interface.

7 . The application processor of claim 5 , wherein the control system is configured to set the data rate of the interface by being configured to demultiplex one application processor signal associated with one lane of the one or more lanes associated with the interface onto a plurality of lanes of the one or more lanes associated with the interface.

8 . The application processor of claim 1 , wherein the control system is configured to set the data/clock mode by being configured to set a data scrambling mode of one or more lanes associated with the interface.

9 . The application processor of claim 8 , wherein the control system is configured to set the data scrambling mode by being configured to assign one or more data scrambling polynomial functions to the one or more lanes associated with the interface.

10 . The application processor of claim 1 , wherein the control system is configured to set the data/clock mode by being configured to set a clock mode of one or more lanes associated with the interface.

11 . The application processor of claim 10 , wherein the control system is configured to set the data/clock mode by being configured to set the clock mode of the one or more lanes associated with the interface to a single data rate (SDR) mode.

12 . The application processor of claim 10 , wherein the control system is configured to set the data/clock mode by being configured to set the clock mode of the one or more lanes associated with the interface to a double data rate (DDR) mode.

13 . The application processor of claim 1 , wherein the control system is configured to set the data/clock mode by being configured to set a clock scrambling mode of one or more lanes associated with the interface.

14 . The application processor of claim 13 , wherein the control system is configured to set the clock scrambling mode by being configured to assign a clock scrambling function to the one or more lanes associated with the interface.

15 . The application processor of claim 1 , wherein:
the one or more application processor signals comprise one or more data signals; and the one or more transceiver signals comprise one or more data signals.

16 . The application processor of claim 1 , wherein:
the one or more application processor signals comprise one or more clock signals; and the one or more transceiver signals comprise one or more clock signals.

17 . The application processor of claim 1 , further comprising the coexistence manager.

18 . The application processor of claim 1 , wherein the application processor receives the information from the coexistence manager positioned remotely from the application processor.

19 . A method for mitigating electromagnetic interference (EMI) experienced by a victim receiver as a result of an aggressor communications bus, comprising:
receiving information from a coexistence manager, the information related to EMI at a victim receiver as a result of an aggressor communications bus; processing a determination of a data/clock mode of an interface that mitigates a performance impact corresponding to the EMI; and setting the data/clock mode of the interface to mitigate the EMI.

20 . The method of claim 19 , further comprising:
receiving information indicating if the victim receiver experiences EMI as a result of the aggressor communications bus; determining an acceptable performance level of the victim receiver; and determining the data/clock mode of which to set the interface to mitigate the EMI experienced by the victim receiver and allow the victim receiver to operate at or above the acceptable performance level.

21 . The method of claim 19 , wherein setting the data/clock mode comprises setting a data rate of one or more lanes associated with the interface to mitigate the EMI.

22 . The method of claim 19 , wherein setting the data/clock mode comprises setting a data scrambling mode of one or more lanes associated with the interface.

23 . The method of claim 19 , wherein setting the data/clock mode comprises setting a clock mode of one or more lanes associated with the interface.

24 . The method of claim 19 , wherein setting the data/clock mode comprises setting a clock scrambling mode of one or more lanes associated with the interface.

25 . A transceiver comprising:
an interface configured to:
couple to an aggressor communications bus;
transmit one or more transceiver signals to the aggressor communications bus; and
receive one or more application processor signals from the aggressor communications bus; and
a control system configured to:
receive information from a coexistence manager, the information related to electromagnetic interference (EMI) at a victim receiver as a result of the aggressor communications bus;
process a determination of a data/clock mode of an interface that mitigates a performance impact corresponding to the EMI; and
set the data/clock mode of the interface to mitigate the EMI.

26 . The transceiver of claim 25 integrated into a device selected from the group consisting of: a system-on-a-chip (S

Assignees

• Qualcomm Inc

Inventors

• Wietfeldt Richard Dominic

Classifications

• H04L12/4013

  Management of data rate on the bus (systems modifying transmission characteristics according to link quality H04L1/0001) · CPC title

• H04B15/02

  Reducing interference from electric apparatus by means located at or near the interfering apparatus · CPC title

• G06F15/163

  Interprocessor communication · CPC title

• G06F13/4265 Primary

  on a point to point bus (G06F13/4247, G06F13/4282 take precedence) · CPC title

• G06F13/38

  Information transfer, e.g. on bus (G06F13/14 takes precedence) · CPC title