Mechanism for channel synchronization

Patent metadata

Field	Value
Publication number	US-9479277-B2
Application number	US-201414581436-A
Country	US
Kind code	B2
Filing date	Dec 23, 2014
Priority date	Feb 2, 2007
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A channel synchronization method in which local serializers serially transmits first n-bit codes, respectively, to remote deserializers, respectively. Also local deserializers serially receive first n-bit codes, respectively, from remote serializers, respectively. One of the first n-bit codes transmitted to one of the remote serializers indicates one of the local deserializers is not link aligned.

First claim

What is claimed is:

1. A method comprising:
detecting that a first n-bit value is received at a first local deserializer of a plurality of local deserializers, wherein
the plurality of local deserializers are configured to receive first data, and
the first n-bit value is received from a first remote serializer of a plurality of remote serializers,
the first n-bit value comprises a first n-bit code, if a plurality of remote deserializers are channel aligned, and
the first n-bit value comprises a second n-bit code, if at least one of the plurality of remote deserializers is not channel aligned; and

sending a second n-bit value from a first local serializer of a plurality of local serializers, in response to the detecting the first n-bit value, wherein
the plurality of local serializers are configured to send second data, and
the second n-bit value is sent to a first remote deserializer of the plurality of remote deserializers.

2. A method comprising:
detecting that a first n-bit value is received at a first local deserializer of a plurality of local deserializers, wherein
the plurality of local deserializers are configured to receive first data, and
the first n-bit value is received from a first remote serializer of a plurality of remote serializers; and

sending a second n-bit value from a first local serializer of a plurality of local serializers, in response to the detecting the first n-bit value, wherein
the plurality of local serializers are configured to send second data,
the second n-bit value is sent to a first remote deserializer of a plurality of remote deserializers,
the second n-bit value comprises a first n-bit code, if the plurality of local deserializers are channel aligned, and
the second n-bit value comprises a second n-bit code, if at least one of the plurality of local deserializers is not channel aligned.

3. The method of claim 1 , further comprising:
aligning the first local deserializer using the first n-bit value received from the first remote serializer, if the first local deserializer is not channel aligned.

4. The method of claim 1 , further comprising:
sending a third n-bit value from the first local serializer to the first remote deserializer, in response to detecting that the plurality of local deserializers are channel aligned.

5. The method of claim 1 , further comprising:
sending a third n-bit value from the first local serializer to the first remote deserializer, in response to detecting at least one of the plurality of local deserializers is not channel aligned.

6. The method of claim 1 , further comprising:
aligning the first remote deserializer using the second n-bit value received from the first local serializer, if the first remote deserializer is not channel aligned.

7. The method of claim 1 , wherein
the first local deserializer outputs the first n-bit value in parallel with respective n-bit values output by each local deserializer of the plurality of local deserializers when the first local deserializer is channel aligned, and
the first local deserializer does not output the first n-bit value in parallel with the respective n-bit values output by the each local deserializer of the plurality of local deserializers when the first local deserializer is not channel aligned.

8. An apparatus comprising:
a node; and
a line card coupled to the node, wherein the line card comprises
a plurality of local serializers configured to serially transmit first data, respectively, to a plurality of remote deserializers,
a plurality local deserializers configured to serially receive second data, respectively, from a plurality of remote serializers, and
a first local deserializer of the plurality of local deserializers configured to detect receipt of a first n-bit value from a first remote serializer of the plurality of remote serializers, wherein
the first n-bit value comprises a first n-bit code, if the plurality of remote deserializers are channel aligned, and
the first n-bit value comprises a second n-bit code, if at least one of the plurality of remote deserializers are not channel aligned, and

a first local serializer of the first local serializers configured to serially transmit a second n-bit value to a first remote deserializer of the plurality of remote deserializers, in response to detection of the receipt of the first n-bit value.

9. An apparatus comprising:
a node; and
a line card coupled to the node, wherein the line card comprises
a plurality of local serializers configured to serially transmit first data to a plurality of remote deserializers,
a plurality local deserializers configured to serially receive second data from a plurality of remote serializers, wherein
a first local deserializer of the local deserializers is configured to detect that a first n-bit value is received at the first local deserializer, and
a first local serializer of the local serializers is configured to send a second n-bit value, in response to the detecting the first n-bit value, wherein
the second n-bit value comprises a first n-bit code, if the plurality of local deserializers are channel aligned, and
the second n-bit value comprises a second n-bit code, if at least one of the plurality of local deserializers is not channel aligned.

10. The apparatus of claim 8 , wherein
the first local deserializer is configured to align itself using the first n-bit value received from the first remote serializer, if the first local deserializer is not channel aligned.

11. The apparatus of claim 8 , wherein
the first local serializer is configured to send a third n-bit value to the first remote deserializer, in response to detecting that the plurality of local deserializers are channel aligned.

12. The apparatus of claim 8 , wherein
the first local serializer is configured to send a third n-bit value to the first remote deserializer, in response to detecting at least one of the plurality of local deserializers is not channel aligned.

13. The apparatus of claim 8 , wherein
the first remote deserializer is configured to align itself using the second n-bit value received from the first local serializer, if the first remote deserializer is not channel aligned.

14. The apparatus of claim 8 , wherein
the first local deserializer outputs the first n-bit value in parallel with respective n-bit values output by each local deserializer of the plurality of local deserializers when the first local deserializer is channel aligned, and
the first local deserializer does not output the first n-bit value in parallel with the respective n-bit values output by the each local deserializer of the plurality of local deserializers when the first local deserializer is not channel aligned.

15. A system comprising:
a local node;
a remote node; and
a communications channel coupling the local node and the remote node, wherein
the communications channel comprises
local transmitting means configured to serially transmit first data to remote receiving means, and
local receiving means configured to serially receive second data from remote transmitting means,

the local receiving means is configured to detect receipt of a first n-bit value from the remote transmitting means, wherein
the first n-bit value comprises a first n-bit code, if the remote receiving means is channel aligned, and
the first n-bit value comprises a second n-bit code, if the remote receiving means is not channel aligned, and

the local transmitting means is configured to serially transmit a second n-bit value to the remote receiving means, in response to detection of the receipt of the first

Assignees

• Cisco Tech Inc

Inventors

• Sharma Neil
• Lawson Matthew Todd
• Jacobs Mick R

Classifications

• H03M7/20

  Conversion to or from n-out-of-m codes · CPC title

• H04J3/0602

  Systems characterised by the synchronising information used · CPC title

• H03M9/00

  Parallel/series conversion or vice versa (digital stores in which the information is moved stepwise per se G11C19/00) · CPC title

• H04J3/0685 Primary

  Clock or time synchronisation in a node; Intranode synchronisation · CPC title

• H04L7/041

  using special codes as synchronising signal · CPC title