Methods and apparatus for constant-weight encoding and decoding

Methods and apparatus for spreading and concentrating information are taught. The present invention relates to constant-weight encoding of data words on a parallel data line bus while allowing communication of information across sub-word paths. In one embodiment, of the present invention, data trans...

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Bibliographic Details
Main Authors CORNELIUS WILLIAM P, ATHAS WILLIAM C
Format Patent
LanguageEnglish
Published 15.07.2004
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
CALCULATING
CODE CONVERSION IN GENERAL
CODING
COMPUTING
COUNTING
DECODING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
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Summary:Methods and apparatus for spreading and concentrating information are taught. The present invention relates to constant-weight encoding of data words on a parallel data line bus while allowing communication of information across sub-word paths. In one embodiment, of the present invention, data transfer rates previously obtained only with differential architecture are achieved by only a small increase in line count above single ended architecture. For example, an 18-bit data word requires 22 encoded data lines for transmission, where previously, 16 and 32 lines would be required to transmit un-coded data with single-ended and differential architectures respectively. Constant-weight parallel encoding maintains constant current in the parallel-encoded data lines and the high and low potential driver circuits for the signal lines.
Bibliography:Application Number: US20030691344