Granted Patent B1

US 9,143,415 · App. 13/852,872 · Granted Sep 22, 2015

Abstract

Claims (31)

1. A machine implemented method of detecting a loss of sync at a port of a network device coupled to a port of another device, comprising:

decoding a frame received at the port of the network device;

detecting, from the decoded frame absence of an expected special character that has not been received by the port of the network device, where absence of the special character is not a code violation that occurs upon receipt of an invalid code at the port;

generating a special character absent signal for a timer module that tracks a duration during which the special character has not been received at the port; and

generating an interrupt signal for a processor of the network device indicating a loss of sync between the port of the network device and the port of another device when the tracked duration reaches a programmable duration.

2. The method of claim 1 , wherein the special character is a K character.

3. The method of claim 2 , wherein the K character is expected within a certain number of frames by the network device.

4. The method of claim 1 , wherein the network device is an adapter.

5. The method of claim 1 , wherein the network device uses Fibre Channel protocol to communicate.

6. The method of claim 1 , wherein the network device uses Fibre Channel over Ethernet protocol for communication.

7. A network device comprising:

a port coupled to a port of another device for sending and receiving frames; wherein the port of the network device includes:

a decode module for receiving and decoding incoming frames;

a word sync logic that detects if valid data has been received and generates a loss of sync signal when valid data is not received;

a special character recognition module that detects absence of an expected special character and sends an absent special character signal for a timer when the special character has not been received by the port; wherein absence of the special character is not a code violation that occurs upon receipt of an invalid code at the port; and

the timer that tracks a duration for which the special character has not been received at the port and generates an interrupt signal for a processor of the network device indicating loss of sync between the port of the network device and the port of the other device when the tracked duration reaches a programmable duration.

8. The network device of claim 7 , wherein the special character is a K character.

9. The network device of claim 8 , wherein a K character is expected within a certain number of frames.

10. The network device of claim 7 , wherein the network device is an adapter.

11. The network device of claim 7 , wherein the network device uses Fibre Channel protocol to communicate.

12. The network device of claim 7 , wherein the network device uses Fibre Channel over Ethernet protocol for communication.

13. A non-transitory, machine readable storage medium having stored thereon instructions for performing a method, comprising machine executable code which when executed by at least one machine, causes the machine to:

decode a frame received at the port of the network device;

detect, from the decoded frame absence of an expected special character that has not been received by the port of the network device, where absence of the special character is not a code violation that occurs upon receipt of invalid code at the port;

generate a special character absent signal for a timer module that tracks a duration during which the special character has not been received at the port; and

generate an interrupt signal for a processor of the network device indicating a loss of sync between the port of the network device and the port of another device when the tracked duration reaches a programmable duration.

14. The non-transitory, machine readable storage medium of claim 13 , wherein the special character is a K character.

15. The non-transitory, machine readable storage medium of claim 14 , wherein a K character is expected within a certain number of frames by the network device.

16. The non-transitory, machine readable storage medium of claim 13 , wherein the network device is an adapter.

17. The non-transitory, machine readable storage medium of claim 13 , wherein the network device uses Fibre Channel protocol to communicate.

18. The non-transitory, machine readable storage medium of claim 13 , wherein the network device uses Fibre Channel over Ethernet protocol for communication.

Assignments (6)