Method of programming for programmable circuit in redundancy circuit system
US4630241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1983 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Dec 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/785
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of programming for a programmable circuit in a redundancy circuit system including a RAM having normal and spare memory cell rows constructed on a common chip and the programmable circuit, is disclosed. The programmable circuit has a plurality of fuses and can produce a signal for disabling all the normal memory cell rows while enabling a spare memory cell row corresponding to a combination of blown-out fuses and non-blown-out ones among the plurality of fuses with respect to a certain normal memory cell row address. The method comprises the steps of detecting a faulty memory cell row, storing the address thereof and supplying a fuse-blowing current one after another of those of the programmable circuit fuses which correspond to a certain logic level bits of the stored address.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.