Method for operating a linear feedback shift register as a serial shift register with a crosscheck grid structure
US4975640A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for operating a multiple input linear feedback shift register (LFSR) as a conventional shift register so that input multiplexers can be eliminated on each parallel input when associated with a CrossCheck matrix. A linear feedback shift register coupled through sense lines of a CrossCheck test matrix is operated as a serial shift register by inputting serial data at the serial data input while maintaining parallel input lines at a zero logic level. Further, zero logic level serial data (null data) is input serially through the shift register prior to the enabling of the parallel input. The method significantly reduces the number of logic structures required to shift the data out serially.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.