Methods and apparatus for constant-weight encoding and decoding
US6844833B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2003 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Oct 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/41
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.