Methods and apparatus for constant-weight encoding and decoding

Details Methods and apparatus for constant-weight encoding and decoding Methods and apparatus for constant-weight encoding and decoding

2005-01-18

2005-01-18

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from minimum d.c. level codes

C341S095000

Reexamination Certificate

active

06844833

ABSTRACT:
Methods and apparatus for spreading and concentrating information to constant-weight encode of data words on a parallel data line bus while allowing communication of information across sub-word paths. In one embodiment, data transfer rates previously obtained only with differential architectures are achieved by only a small increase in line count above single ended architectures. 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.

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