Apparatus and method for 8B/10B code-group validity check

Details Apparatus and method for 8B/10B code-group validity check Apparatus and method for 8B/10B code-group validity check

2007-04-17

2007-04-17

Young, Brian (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

Reexamination Certificate

active

10718759

ABSTRACT:
An apparatus and method for checking validity of an 8B/10B code-group are provided. The apparatus for checking validity of an 8B/10B code-group includes a 6B/5B disparity classification unit, a 4B/3B disparity classification unit, an RD6 detection unit, an RD4 detection unit, an 8B/10B code-group rule violation detection unit, an RD error detection unit, and a unit for outputting 8B/10B code-group validity. The apparatus receives an 8B/10B code-group, divides into a least significant 6-bit nibble and a most significant 4-bit nibble, detects a running disparity, and by doing so, determines the validity of a code-group. The apparatus and method for checking validity of an 8B/10B code-group relatively shortens the critical path, which indicates the number of combinational logic circuits that should be operated in a unit time, and therefore the apparatus and method are appropriate to high-speed systems such as gigabit Ethernet systems.

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A.X. Widmer et al., “A DC-Balanced, Partitioned-Block, 8B/10B Transmission Code”, IBM J.Res.Develop. vol. 27, No. 5, Sep. 1983.

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