Advanced and dynamic physical layer device capabilities utilizing a link interruption signal

• US 8,665,895 B2
• Filed: 12/30/2010
• Issued: 03/04/2014
• Est. Priority Date: 12/30/2010
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.), Firmenich SA (DSM-Firmenich AG)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Diab, Wael William, Powell, Scott
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): LEE, ANDREW CHUNG CHEUNG
• Application Number:
  US12/981,875
• Publication Number:
  US 20120170591A1
• Time in Patent Office: 1,160 Days
• Field of Search: 370/389, 370/392, 370/417, 370/428, 370/463, 370/464, 370/465, 370/466, 370/471, 370/473, 370/474
• US Class Current: 370/417
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer

Abstract

Advanced and dynamic physical layer device capabilities utilizing a link interruption signal. The physical layer device can use a link interruption signal to signal to a media access controller device that the link has temporarily been interrupted. This link interruption signal can be generated in response to one or more programmable modes of the physical layer device that are used to support the advanced and dynamic physical layer device capabilities.

Claims

1. A method for frame retransmission in a physical layer device, comprising:

establishing a link between a local physical layer device and a remote physical layer device, said local physical layer device and said remote physical layer device being coupled via a network cable;

transmitting an Ethernet frame over said established link to said remote physical layer device;

identifying a need to retransmit said Ethernet frame to said remote physical layer device

transmitting a link interruption signal from said local physical layer device to a local media access control coupled to said local physical layer device, said transmitted link interruption signal alerting said local media access control to hold off transmission to said local physical layer device,

retransmitting said Ethernet frame to said remote physical layer device while said local media access control is holding off transmission based on said transmitted link interruption signal; and

after said retransmission is complete, de-asserting, by said local physical layer device,said link interruption signal, said de-asserting enabling said local media access control to resume transmission to said local physical layer device.

2. The method of claim 1, wherein said transmitting comprises transmitting an in-band signal with data.

3. The method of claim 1, wherein said transmitting comprises transmitting an out-of-band signal.

4. The method of claim 1, wherein said local physical layer device does not include buffering.

5. The method of claim 1, further comprising buffering traffic in a transmit queue during said retransmitting.

6. A link retrain method in a physical layer device, comprising:

establishing a link between a local physical layer device and a remote physical layer device, said local physical layer device and said remote physical layer device being coupled via a network cable, wherein said local physical layer device and said remote physical layer device each include both an active state and a low power state;

from said low power state, transitioning, by said local physical layer device, to said active state;

if it is determined that retraining between said local physical layer device and said remote physical layer device is needed, then transmitting a link interruption signal from said local physical layer device to a local media access control device coupled to said local physical layer device, said transmitted link interruption signal alerting said local media access control device to hold off transmission to said local physical layer device;

performing, by said local physical layer device, a retrain process with said remote physical layer device while said local media access control device is holding off transmission based on said transmitted link interruption signal; and

after said retraining is complete, de-asserting, by said local physical layer device, said link interruption signal, said de-asserting enabling said local media access control device to resume transmission to said local physical layer device.

7. The method of claim 6, wherein said transmitting comprises transmitting an in-band signal with data.

8. The method of claim 6, wherein said transmitting comprises transmitting an out-of-band signal.

9. The method of claim 6, further comprising buffering traffic in a transmit queue during said retransmitting.

10. The method of claim 6, wherein said low power state is a low power idle state.

11. The method of claim 6, wherein said low power state is a subset physical layer device state.