Method and device to control a memory
US5996093A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Mar 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/5681
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and a device for determining that digital information written into a memory is correctly readable before such read information, in the form of a number of coordinated bit positions, is used to control one or several functions, where the functions can be activated by a computer unit. A selected address position or positions within the memory corresponding to the stored digital information points out a first set of bits, required to control and/or initiate the functions, and a second set of bits serving as a control sum. The second set of bits is calculated taking into consideration the current set of bits corresponding to the first set of bits and a third set of bits, corresponding to the address position currently selected for readout. When the following readout of the digital information out of the memory is performed, a new control sum is calculated in the same way, taking into consideration the currently read bit positions corresponding to the first set of bits and a fourth set of bits corresponding to the address position currently selected for readout, to form a fifth set of bits. The read digital information is accepted as correct when a comparison is performed and a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.