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Comma alignment with scrambled data

A technology of data and data flow, applied in electrical digital data processing, monitoring pulse chain mode, instruments, etc., can solve the problem of time-consuming alignment

Inactive Publication Date: 2012-10-17
CISCO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a 2-bit alignment pattern will very likely appear in 64-bit scrambled data
Therefore, aligning to known 2-bit patterns can be time-consuming because many false 2-bit patterns can be identified during the alignment process

Method used

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  • Comma alignment with scrambled data
  • Comma alignment with scrambled data
  • Comma alignment with scrambled data

Examples

Experimental program
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Embodiment Construction

[0017] overview

[0018] An exemplary embodiment generates a data stream that is inspected to determine SERDES alignment. The data stream includes repetitions of two-part sequences. The two-part sequence includes a random part and an alignment character. The alignment character may be, for example, a 10-bit "comma" character. In this example, the two-part sequence would consist of 10-bit comma characters interspersed with N 10-bit random characters. In one embodiment, N can be any positive integer. N may also be selected from a predetermined range of values ​​set by a user (for example, an administrator). Since the N 10-bit characters are random, one of the N 10-bit random characters may appear as a 10-bit aligned character. If this happens, replace one of 1-N 10-bit random characters (presented as alignment characters) with a different random value. In one example, the alignment character is increased to generate a new random value.

[0019] Alignment characters shall ...

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PUM

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Abstract

Computer-readable media, apparatus and other embodiments associated with performing comma alignment with scrambled data are described. One example method includes controlling an apparatus to generate a data stream that facilitates achieving and determining alignment in a device. The data stream includes sequences of N random portions of Y-bit characters followed by a Z-bit alignment character, N, Y and Z being integers. Another example method includes controlling an apparatus to receive and examine the data stream. The method also includes generating an alignment signal upon determining an alignment for recovered data in the device.

Description

Background technique [0001] A serializer / deserializer (SERDES) equipped with a decision feedback based equalizer (DFE) requires scrambled random data to efficiently train the DFE taps. However, the circuitry and / or logic to receive recovered data from the SERDES has conflicting requirements. Circuitry and / or logic receiving recovered data requires a predictable pattern (eg, alignment characters, comma characters) at certain intervals to align the recovered data to known boundaries. Balancing these requirements leads to tradeoffs in speed, randomness, and other factors. In some cases, these tradeoffs may not be acceptable. [0002] A conventional method known as 8b10b encoding uses the K28.4 "comma" character to align SERDES data to known boundaries. Other conventional methods transmit a fixed 10-bit value continuously until the link alignment circuitry and / or logic completes the bit alignment. Continuously transmitting a fixed bit pattern is the exact opposite of transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/00
CPCG06F13/00H03K5/19
Inventor 马修·托德·劳森
Owner CISCO TECH INC