Multiple programmable initialize words in a programmable read only memory
US4646269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Sep 18, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C17/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A programmable read-only memory (40) is provided which is capable of storing a plurality of initialize words. The memory includes an initialize input lead (9) and appropriate addressing circuitry (7) so that when the appropriate initialize input signal is placed on the initialize input lead, one of several pre-programmed initialize words is placed in the output register (6) of the programmable read-only memory. The word that is placed in the output register is selected according to signals applied to selected address input leads (A.sub.0 through A.sub.3) of the programmable read-only memory. The number of address input signals utilized to determine which initialize word is placed in the output register of the programmable read-only memory is a selected subset of the available address input signals provided to the memory. The described embodiment provides sixteen initialize words using a minimum number of components. The sixteen initialize words are stored in an additional row (12) of the programmable array which contains the memory's normally addressable data words. Because the initialize word circuit (12) is configured as an extra row of the programmable array, the initialize word…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.