Programmable logic device structures in standard cell devices
US6515509B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 2000 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Jul 13, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/17796
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated-circuit using a routing ring is disclosed. The routing ring has an internal routing grid and an external routing gird. Logic circuits surrounded by the routing ring use the internal routing grid while logic circuits outside the routing ring use the external routing grid. The internal and external routing grids can use different pitches so that circuits outside the routing ring can be optimized to a first pitch. Similarly, logic circuits surrounded by the routing ring can be optimized to use a second pitch. In one embodiment, the routing ring includes a plurality of wires that connect the logic circuits surrounded by the routing ring to the logic circuits outside the routing ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.