Logic block for programmable logic devices
US5128559A · kind A · utility
235Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1991 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Aug 8, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17728
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A standard logic block, or macrocell, is provided for use on programmable logic devices. The macrocell uses RAM to perform logic functions, and further includes circuitry which allows writing of data to the RAM during use. Each logic block can be configured at programming time to be either a user RAM, allowing the user to write data to such memory during use, or configured as performing logic functions. The contents of macrocells configured as providing logic functions cannot be changed except by reprogramming the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.