Mask-programmable logic device with programmable input/output ports
US7304496B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2005 |
| Grant date | Dec 4, 2007 |
| Priority date | — |
| Expiry date | Aug 3, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17796
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mask-programmable logic device includes a macrocell having an external input/output port for “place-and-route” programming by addition of metallization layers. A programmable “fixed” layer allows the external input/output port to be isolated from the remainder of the macrocell so that it “floats,” allowing signals to be routed through the external input/output port when the macrocell is not in use, to reduce routing blockages. The macrocell also may have at least one internal input/output port, potentially connected to different logic circuits, and a programmable “fixed” layer that can be used to control which internal input/output port is connected to the external input/output port. By thus allowing multiple logic circuits to share a single external input/output port, routing blockages are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.