Patent US6188464B1 successfully refreshed from Google Patents.
Patent US6370677B1 successfully refreshed from Google Patents.
US6370677B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for maintaining hierarchy throughout the integrated circuit design process
Assignee: Xilinx Inc
•
Filing: 2000-01-20
•
Granted: 2002-04-09
•
Expires: 2020-01-20
Abstract
Abstract A method and system for translating abstract structural or behavioral circuit descriptions to physically implementable files, preferably suitable for use in a Field Programmable Gate Array (FPGA) or other programmable device. A selection of layouts are generated for a cell definition (a function), allowing optimization and acceleration of circuit placement and routing without compromising design hierarchy or altering design function. Layout transformation functions may be manually initiated or automtically selected and applied during implementation of a placement algorithm.
Inventors
- 👤 Colin Carruthers
- 👤 Irene Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:17
CPC Classifications
G; G06; G06F; G06F30/00; G06F30/30; G06F30/34; G06F30/347; G06F30/39; G06F30/392
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A method of using alternative layouts for various instances of cell definition in a configurable architecture, the method comprising: creating a default cell definition layout; applying a transformation constant to the default cell definition layout, thereby creating a transformed cell layout; and integrating the default cell definition layout and the transformed cell layout into an algorithm for placement and routing of a user's design in the configurable architecture.
Claim 2
Independent Claim
68 words
A method of using alternative layouts for various instances of cell definition in a configurable architecture, the method comprising: creating a default cell definition layout; applying a transformation constant to the default cell definition layout, thereby creating a transformed cell layout; and integrating the default cell definition layout and the transformed cell layout into an algorithm for placement and routing of a user's design in the configurable architecture.
Claim 3
Dependent Claim
21 words
The method of claim 1 , wherein applying includes: rotating the default cell definition layout by a predetermined number of degrees.
Claim 4
Dependent Claim
17 words
The method of claim 2 , wherein the predetermined number of degrees is a multiple of 45.
Claim 5
Dependent Claim
20 words
The method of claim 1 , wherein applying includes: reflecting the default cell definition layout about a predetermined degree line.
Claim 6
Dependent Claim
16 words
The method of claim 4 , wherein the predetermined degree line is a multiple of 45.
References Cited (Backward Citations)
US4918440A
Cited
US5448493A
Cited
US5659484A
Cited
US5557533A
Cited
US5661663A
Cited
US5838954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-04-08 | 2005-10-08 | 2006-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-08 | 2009-10-08 | 2010-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-08 | 2013-10-08 | 2014-04-09 | $7700.00 | Window Closed / Lapsed |