Method and device for updating information elements in a memory
US5479637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Feb 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/105
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for updating information elements in a memory which includes a plurality of memory locations. An initial value D0 has been written at a first location E0 of the memory, E0 being determined by an initial value of a string of indicator bits, the initial value being defined by the parity of the rank of a last bit of the string of indicator bits in a programmed state. The method includes: writing a new value D1 at another location E1 of the memory, E1 being determined by the initial value of the string of logic indicator bits; verifying the written value in E1 by comparing the written value in E1 with D1; emitting an error code to a processing unit, if, after verifying the written value in El, the written value in E1 does not match D1; erasing the string of indicator bits entirely so that all of the indicator bits are in a blank state and writing the first bit to the programmed state, if, after verifying the written value in El, i) all the indicator bits are in the programmed state and ii) the written value in E1 matches D1, so as to make the value written in E1 accessible in a reading mode; and writing a first bit of the string of indicator bits in a blank state to the progra…
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